FOAMED CHOCOLATE AND PROCESS FOR PRODUCING THE SAME

Abstract: A foamed chocolate which can be foamed without resort to any special apparatus or emulsifiers, has a lightened chocolate texture and shows no oily feel. This foamed chocolate is produced by adding an oil mixture comprising an edible fat or oil with tri-saturated fatty acid glycerides containing behenic acid.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a foamed chocolate and process for its production. More particularly, it relates to a foamed chocolate which can be foamed by a simple apparatus such as a vertical type mixer without requiring a specified emulsifier, and a process for producing the foamed chocolate. Background Art Recently, there is an increasing trend towards producing a variety of products with light textures (mouthfeel) by combining chocolates with baked confectionery, for example, biscuits. For the purpose of lightening the textures of chocolate products themselves without combining with other confectionery, so-called whipped chocolate, a chocolate in which foam is incorporated into a chocolate product, is also produced. As a method for incorporating foam into a chocolate product, for example, the following methods have been reported: a method comprising the steps of decreasing the specific gravity by stirring a chocolate and then putting the chocolate under decreased pressure (JP 62-275648 A, JP 63-202341 A); a method comprising the steps of decreasing the specific gravity by incorporating a compressed gas into a blend of chocolate ingredients and restoring the pressure to normal (JP 62-58955 A, JP 63-49040 A); a method comprising a step of foaming with emulsifiers (JP 1-144934 A, JP 5-211842 A); a method comprising steps of decreasing the specific gravity of a blend of chocolate ingredients by mixing foamed shortening and a blend of chocolate ingredients (JP 63-28355 A); a method comprising the steps of formulating fats and oils containing a certain minimum amount of triglycerides whose constituent fatty acid residues have 58 or more total carbon atoms in a blend of chocolate ingredients, stabilizing the foams incorporated by crystallization of the fats and oils, and thus decreasing the specific gravity of the blend of chocolate ingredients (JP 3-201946 A); and the like. From US-A-5 753 296, US-A-5 709 903, US-A-5 882 709 and EP-A-0 390 408 chocolate compositions comprising caprocaprylbehenin as reduced-calorie fat are known. Further, since a chocolate contains vegetable fats and oils such as cocoa butter which quickly melt around body temperature, there occurs the problem that such a chocolate easily melts in summer time. In order to prevent melting owing to the outside air temperature, high melting point fats, which are not melted at the outside air temperature, are generally added to provide the chocolate with high heat resistance. However, addition of such high melting point fats causes a problem that the good mouth melt property, which is an intrinsic property of a chocolate, deteriorates. As described above, among the methods for incorporating foams into a blend of chocolate ingredients for the purpose of lightening the chocolate texture (mouthfeel), although those comprising the steps of decreasing or increasing pressure for foaming can significantly decrease the specific gravity of a chocolate, they require a large scale apparatus and they are thus unsuitable for easy and simple production of a foamed chocolate. On the other hand, although the foaming methods using specified emulsifiers are easy, the methods require relatively large amounts of emulsifiers to be added to a blend of chocolate ingredients in order to stabilize the incorporated foams and, when considerably decreasing the specific gravity of a blend of chocolate ingredients, oil components in a blend of chocolate ingredients have to be increased (preferably by 50% or more). Further, such methods give an intense taste of emulsifiers, especially synthesized emulsifiers, which is generally undesirable. When using a fatty acid ester of polyglycerin with an HLB of 7 to 8 as an emulsifier, it is necessary to whip the chocolate in a temperature range high enough to prevent crystallization of fats and oils of the chocolate itself (generally 35°C or higher). Further, the emulsifier is easily affected by the milk fat solids of the chocolate itself, which results in, for example, difficulty in whipping of a white chocolate while a black chocolate can be whipped. Moreover, it is difficult to completely dissolve the fats and oils because of the emulsifier of such a system which has an HLB around average. On the other hand, when using a fatty acid ester with a polyglycerin with a low HLB, fats and oils of the chocolate itself should be crystallized and, after the crystals are formed, temperature control becomes difficult after whipping. although such a type of emulsifier is hardly affected by the milk fat solids of the chocolate, it is affected by the fats and oils used for the chocolate and the process becomes complicated. When producing a foamed chocolate by mixing foamed shortening, it is necessary to increase the amount of the shortening to be added in order to decrease the specific gravity, resulting in such disadvantages that the amount of oils in the chocolate is increased as well as that the chocolate tends to have an oily mouthfeel when being mixed with the foam of the shortening since foaming is performed only with the previously foamed shortening in which the foams are covered only with fats and oils. Further, in the other method disclosed in JP 3-201946 A, i.e., the method comprising the steps of formulating fats and oils containing a certain minimum amount of triglycerides whose constituent fatty acid residues have 58 or more total carbon atoms in a blend of chocolate ingredients, a preferred fat and oil composition is that containing a specific amount of mixed acid triglycerides which contains at least one residue of saturated fatty acid residues having 20 to 24 carbon atoms and at least one unsaturated acid fatty acid residue having 16 to 22 carbon atoms in a molecule, whose constituent fatty acids are saturated fatty acids having 20 to 24 carbon atoms and unsaturated fatty acids having 16 to 22 carbon atoms present in a specified ratio. However, such fats and oils do not exist so much in nature and therefore it is necessary to carry out interesterification of fat and oil raw materials so that such a fat and oil composition can be realized and further to carry out fractionation to obtain fractionated middle melting point portions and consequently, production of such a fat and oil composition itself becomes extremely complicated. Further, being in a melted state, if fully hydrogenated oils of tri-saturated triglycerides are added to a blend of chocolate ingredients in place of those fats and oils, the melting point of the fats and oils in the blend of chocolate ingredients is increased so as to make whipping impossible. On the other hand, as a method for providing a chocolate with high heat resistance, it is usual to add high melting point fats. However, this results in the disadvantage that mouth melt property, which is one of the intrinsic properties of a chocolate, deteriorates. That is because high melting point fats remain in the mouth for a long period of time without being melted owing to the increase of the melting point of the fat and oil themselves by addition of the high melting point fats and more particularly owing to the increase of the content of fats in the solid around body temperature or at a temperature slightly higher than body temperature attributed to the effect of the high melting point fats. SUMMARY OF THE INVENTION The present inventors have studied intensively and, as a result, they have found that a foamed chocolate can be obtained without resort to any special apparatus or emulsifiers. Thus, the present invention has been completed. Specifically, the present invention provides a foamed chocolate comprising a formulation of an oil mixture comprising edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid; a process for producing such a foamed chocolate comprising melting the crystals of an oil mixture comprising edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid by heating, cooling the oil mixture to precipitate the crystals of the tri-saturated fatty acid glycerides containing behenic acid, adding the oil mixture in such a state to a chocolate, and whipping the resulting chocolate. Most Preferred Embodiments of the Invention The edible fats and oils used in the present invention include, for example, vegetable fats and oils such as rapeseed oil, soybean oil, sunflower seed oil, cottonseed oil, peanut oil, rice bran oil, corn oil, safflower oil, olive oil, kapok oil, sesame oil, evening primrose oil, palm oil, shea butter, sal butter, cacao butter, coconut oil, palm kernel oil, and the like; and processed fats and oils produced by hydrogenation of these fats and oils, fractionation of them, interesterification of them and the like. The vegetable fats and oils are excellent in taste as compared with animal fats and oils such as fish oils. It is preferable to use fats and oils in the liquid state at 20°C. When an oil mixture comprising fats and oils in the liquid state at 20°C and tri-saturated fatty acid glycerides containing behenic acid is added to a blend of chocolate ingredients (a mixture of chocolate liquor and other ingredients) and whipped, since the tri-saturated fatty acid glycerides containing behenic acid maintains fluidity even in the crystallized state in a wide temperature range, workability is improved. Alternatively, it is preferable to use hard butter, for example, cacao butter, tempered type fats and oils such as substitutes of cacao butter and the like, trans-type hard butter containing elaidic acid as a constituent fatty acid, as well as coconut oil, palm kernel oil, and lauric type fats and oils such as their hydrogenated oils and the like. The heat resistance of a foamed chocolate is improved by obtaining the foamed chocolate by adding an oil mixture containing a hard butter and tri-saturated fatty acid glycerides containing behenic acid to the chocolate texture and whipping the resulting mixture. The tri-saturated fatty acid glycerides containing behenic acid of the present invention can generally be obtained by hydrogenating fats and oils containing erucinic acid so as to have an iodine value of 1 or lower and a melting point of 60°C or higher. (Saturated behenic acid can be obtained by hydrogenating unsaturated erucinic acid). Examples of fats and oils containing 30% or more of erucinic acid are rapeseed oil with a high erucinic acid concentration, mustard oil, cramb oil, uzenbaren oil, and the rapeseed oil with high erucinic acid concentration is preferable owing to its ease of availability. Also tri-saturated fatty acid glycerides mean triglycerides containing constituent fatty acids all of which are saturated fatty acids. It is preferred in the present invention to use the edible fats and oils together with the tri-saturated fatty acid glycerides containing behenic acid in the ratio of 85 : 15 to 95 : 5. If the tri-saturated fatty acid glycerides are used in more than the above described ratio range, the fluidity of the oil mixture is reduced and not only the handling of the mixture but also the whippability tend to be adversely affected at the time of mixing with a chocolate texture. On the other hand, if the tri-saturated fatty acid glycerides are in less amount than the ratio range, the whipping property is reduced at the time of mixing with a chocolate texture. For adding the oil mixture containing edible fats and oils as well as tri-saturated fatty acid glycerides containing behenic acid to a blend of chocolate ingredients, it is preferable to add the tri-saturated fatty acid glycerides at their final concentration in the blend of chocolate ingredients of 0.5 to 2%, more preferably 1 to 2%. If the addition amount is higher than this range, the melting point of the fats and oils becomes too high and, although whipping can be performed at first, the viscosity sharply increases during the whipping step and at some time solidification takes place depending on the temperature at the time of whipping. Further, even if whipping can be performed, although being provided with high heat resistance, the resulting chocolate becomes considerably inferior in mouth melt property and its product value as confectionery is considerably reduced. In contrast with that, if the addition amount is lower than the above range, the specific gravity of the chocolate is not reduced. The specific gravity of a foamed chocolate in the present invention is 0.5 to 0.9. If the specific gravity is higher than 0.9, the chocolate texture is the same as those of conventional chocolates and a light texture cannot be obtained. In contrast with that, if the specific gravity is lower than 0.5, the chocolate texture is significantly lightened. However, the fluidity of the chocolate is destroyed owing to the rather high quantity of foam incorporated and thus the workability after whipping is undesirably much reduced. Incidentally, the specific gravity is measured by filling a container with the foamed chocolate, measuring the weight of the contents, and dividing the measured weight by the weight of water which fills the container. In the present invention, it is preferable to use fats and oils produced by completely melting an oil mixture containing edible fats and oils with tr-saturated fatty acid glycerides containing behenic acid and then cooling the temperature of the oil mixture to 30 to 45°C to precipitate crystals and using the resulting oil mixture in the cooled state. Owing to this, a fat and oil composition in which crystals of tri-saturated fatty acid glycerides containing behenic acid are dispersed in low melting point-fats and oils having lower melting points than those of the glycerides can be obtained and it is suitable for use as an additive for foaming. Using an apparatus capable of kneading an oil mixture, e.g. an Onreitoroe, the oil mixture containing edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid is cooled after it is completely melted to 30 to 45°C and kept cooled to produce the oil mixture. When using a method other than the above, for example, a method comprising the steps of simply keeping the oil mixture at room temperature and then gradually cooling the oil mixture, the size of the crystals becomes too large and therefore the oil mixture becomes unsuitable to incorporate foams into the chocolate. In contrast with that, if rapid cooling is carried using a Combinator™, the resulting oil mixture in this case also becomes unsuitable to incorporate foams into the chocolate, supposedly attributable to the difference in the crystal systems. In the present invention, an oil mixture containing edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid is required to be whipped at a temperature at which the crystals of the tri-saturated fatty acid glycerides containing behenic acid are not melted. Especially, it is necessary for the tri-saturated fatty acid glycerides containing behenic acid to be in a crystallized state and owing to this, since the tri-saturated fatty acid glycerides containing behenic acid do not mutually affect, for example, cocoa butter or the like in the blend of chocolate ingredients, they do not reduce the mouth melt property of the chocolate. However, when the oil mixture is used in a completed melted state, not only the amount of crystals necessary to carry out whipping is insufficient to reduce the specific gravity of the chocolate but also the tri-saturated fatty acid glycerides containing behenic acid mutually affect the other fats and oils, for example, cocoa butter in a blend of chocolate ingredients so as to increase the melting points of the fats and oils and, resulting in finally obtained chocolate having considerably inferior mouth melt property even though the heat resistance of the chocolate is increased. Hence, the product temperature of the blend of chocolate ingredients is required to be adjusted within a range from 25°C to 40°C and the temperature of the oil mixture containing edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid has to be adjusted in the same manner, and they are mixed and then whipped. Incidentally, when using a tempering type blend of chocolate ingredients, it is possible to carry out mixing at a temperature of, for example, 31°C, at which tempering of a chocolate subjected to tempering is not broken, and then to carry out whipping. A chocolate of the present invention includes any chocolate; a sweet chocolate, a milk chocolate, a black chocolate, a white chocolate and the like, in terms of blending of ingredients and also includes those produced using other fats and oils in place of some or all of the cacao butter, especially using a cacao butter substitute (hard butter). Any conventionally known chocolates may be usable. The content of the raw material chocolate in the foamed chocolate is preferably 60% or higher. Examples The present invention will now be described more particularly along with examples of the present invention. Incidentally, the terms, "percents" and "parts" in the examples respectively are by weight. Example 1 After an oil mixture of 90 parts of slightly hydrogenated rapeseed oil (iodine value 95) with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was completely melted at 80°C, the resulting oil mixture was cooled to 40°C product temperature of the oils and fats in a water tank containing water at 15°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting oil mixture in such a state was maintained at 20°. Separately, 90 parts of a sweet chocolate (produced by Fuji Oil. Co., Ltd., trade name, "Sweet Chocolate", oil content 34%) subjected to tempering at the minimum point 26°C and reheating point at 28°C was maintained at product temperature 30°C and mixed with 10 parts of the above described oil mixture and whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.75. Example 2 Twenty parts of an oil mixture produced in the same manner as in Example 1 from 90 parts of rapeseed oil (iodine value 117) with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was added to 80 parts of a chocolate produced from a milk chocolate (produced by Fuji Oil. Co., Ltd., trade name, "Milk Chocolate", oil content 34%), which was melted in a water bath at 50°C, cooled to 30°C, mixed with a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed A") in an amount of 0.2% to the chocolate, and subjected to tempering, and then a foamed chocolate was obtained from the resulting mixture by the same treatment as that in Example 1. The specific gravity of the obtained foamed chocolate was measured and found to be 0.66. Example 3 A foamed chocolate was obtained by the same treatment as that in Example 1 except that the mixing amounts of the slightly hydrogenated rapeseed oil (iodine value 95) with a low erucinic acid content and the fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid were changed to 95 parts and 5 parts, respectively, and 20 parts of the resulting oil mixture was added to 80 parts of the chocolate subjected to tempering. The specific gravity of the obtained foamed chocolate was measured and found to be 0.84. Example 4 Twenty parts of an oil mixture produced in the same manner as in Example 1 from 90 parts of the slightly hydrogenated rapeseed oil (iodine value 95) with a low erucinic acid content and 10 parts of the fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) or rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was added to 80 parts of a non-tempered chocolate (produced by Fuji Oil. Co., Ltd., trade name, "MSM", oil content 36%) and whipped at product temperature 40°C by high speed stirring to obtain foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.85. The characteristics of the foamed chocolates produced are collectively shown in Table 1. Results of Example 1 to Example 4 No. Item Example 1 Example 2 Example 3 Example 4 1 Edible fats and oils Slightly hydrogenated oil of rapeseed oil with low erucinic acid content Rapeseed oil with a low erucinic acid content Slightly hydrogenated oil of rapeseed oil with low erucinic acid content Slightly hydrogenated oil of rapeseed oil with low erucinic acid content 2 Types of tri-saturated fatty acid glycerides or other high melting point fats and oils fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content 3 Ratio of 1 to 2 90:10 90:10 95:5 90:10 4 Ratio of 3 to chocolate 10:90 20:80 20:80 20:80 5 oil content (%) of 4 40.6 47.2 47.2 48.8 6 specific gravity of 4 0.75 0.66 0.84 0.85 7 Content (%) of 2 in the total amount of chocolate 1 2 1 2 8 Temperature (°C) at the time of whipping 30 30 30 40 9 Workability Good Good Good Good 10 Taste feel Good Good Good Good The chocolates of Examples 1 to 4 were provided with specific gravity values sufficiently reduced as compared with conventional chocolates and gave lightened textures. Regarding workability, no problem arose in their production. In this way, that foams were enabled to be incorporated in the chocolates using a simple apparatus was supposedly attributable to the crystal system and size becoming optimum to incorporate foams since the oil mixtures of edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid were completely melted at first and then the product temperature was cooled down to 30°C to 45°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting cooled fats and oils were used. Example 5 After an oil mixture of 89 parts of hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7") and 11 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was completely melted at 80°C, the oil mixture was cooled to 38°C product temperature of the oils and fats in a water tank containing water at 15°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting oil mixture in such a state was maintained at 20°C. Separately, to a milk chocolate (produced by Fuji Oil. Co., Ltd., trade name, "Milk Chocolate", oil content 34%), the hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7") for oil component adjustment was added to adjust the oil components to 41%, and after cooling to 35°C, adding a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed B") at 3.0% to the chocolate, and tempering, 90 parts of the resulting chocolate were mixed with 10 parts of the above described oil mixture whose temperature was controlled at 37°C and whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.78. Example 6 After an oil mixture of 89 parts of a hydrogenated oil (iodine value 71, melting point 35°C) of rapeseed oil with a low erucinic acid content and 11 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was completely melted at 80°C, the oil mixture was cooled to 40°C product temperature of the fats and oils in a water tank containing water at 15°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting oil mixture in such a state was maintained at 20°C. Separately, to a sweet chocolate (produced by Fuji Oil Co., Ltd., trade name, "Sweet Chocolate", oil components 34%), the hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7") for oil component adjustment was added to adjust the oil components to 41%, and after cooling to 30°C, adding a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed A") in an amount of 0.2% to the chocolate, and tempering, 90 parts of the resulting chocolate were mixed with 10 parts of the above described oil mixture whose temperature was controlled at 40°C and whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.80. Example 7 After an oil mixture of 89 parts of a refined coconut oil (iodine value 8.5, melting point 24°C) and 11 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content, as the tri-saturated fatty acid glycerides containing behenic acid was completely melted at 80°C, the oil mixture was cooled to 32.5°C product temperature of the fats and oils in a water tank containing water at 15°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting oil mixture in such a state was maintained at 20°C. Separately, to a sweet chocolate (produced by Fuji Oil Co., Ltd., trade name, "Sweet Chocolate", oil components 34%), the hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7"), for oil component adjustment was added to adjust the oil components to 41%, and after cooling to 30°C, adding a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed A") in an amount of 0.2% to the chocolate, and tempering, 90 parts of the resulting sweet chocolate were mixed with 10 parts of the above described oil mixture whose temperature was controlled at 35° and whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.79. The characteristics of the foamed chocolates produced are collectively shown in Table 2. Results of Example 5 to Example 7 No. Item Example 5 Example 6 Example 7 1 Edible fats and oils Hard butter Hydrogenated oil with a low erucinic acid content Refined coconut oil 2 Type of trisaturated fatty acid glycerides or other high melting point fats and oils fully hydrogenated oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content 3 Ratio of 1 to 2 89:11 89:11 89:11 4 Ratio of 3 to chocolate 10:90 10.90 10.90 5 oil content (%) of 4 47.2 47.2 47.2 6 specific gravity of 4 0.78 0.8 0.79 7 The content (%) of 2 in the total amount of chocolate 1.1 1.1 1.1 8 Temperature (°C) at the time of whipping 33 30 30 9 Workability Good Good Good 10 Taste feel Good Good Good Regarding the chocolates of Examples 5 to 7, the specific gravity values were sufficiently reduced as compared with those of conventional chocolates and their taste feel was lightened. Regarding workability, no problems arose in their production. In this way, that foams were enabled to be incorporated into the chocolates using a simple apparatus as supposedly attributable to the crystal system and size becoming optimum to incorporate foams since the oil mixtures of edible vegetable fats and oils with tri-saturated fatty acid glycerides containing behenic acid were completely melted at first and then the product temperature was cooled down to 30°C to 45°C to precipitate crystals of the tri-saturated fatty acid glycerides containing behenic acid and the resulting cooled fats and oils were used. The heat resistance of the foamed chocolates produced was evaluated. Evaluation Example 1 After foamed chocolates produced in Example 5 were aged at 20°C for 1 week, they were kept at their respective preservation temperature values of 2 hours and then the load of each foamed chocolate was measured using a rheometer (using a plunger with the diameter of 10 mm). Evaluation Comparative Example 1 Twenty parts of hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7") mixed with an emulsifier (produced by Sakamoto Yakuhin Kogyo Co. Ltd., trade name, "SY-Glyster PS 310") for whipping was additionally mixed with 80 parts of a milk chocolate (produced by Fuji Oil Co., Ltd., trade name, "Milk Chocolate", oil content 34%). The addition amount of the emulsifier was controlled so as to be 0.5% in the finally obtained chocolate. The resulting chocolate whose oil components were thus adjusted was cooled to 35°C and further mixed with a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed B") in an amount of 3.0% in the chocolate and subjected to tempering. The obtained chocolate was whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.75. After the foamed chocolate was aged at 20°C for 1 week, the heat resistance of the chocolate was measured in the same manner as in Evaluation Example 1. Evaluation Comparative Example 2 Ten parts of hard butter (iodine value 34, melting point 34°C, produced by Fuji Oil Co., Ltd., trade name, "Melano New SS7") mixed with an emulsifier (produced by Sakamoto Yakuhin Kogyo Co., Ltd., trade name, "SY-Glyster PS310") for whipping was additionally mixed with 80 parts of a milk chocolate (produced by Fuji Oil Co., Ltd., trade name, "Milk Chocolate", oil components 34%). The addition amount of the emulsifier was controlled so as to be 0.5% in the finally obtained chocolate. Further added were 10 parts of heat resistant fats and oils (iodine value 34.5, melting point 37°C, produced by Fuji Oil Co., Ltd., trade name, "Melano SS400"). The resulting chocolate whose oil components were thus adjusted was cooled to 35°C and further mixed with a seed agent (produced by Fuji Oil Co., Ltd., trade name, "Choco Seed B") in an amount of 3.0% in the chocolate and subjected to tempering. The obtained chocolate was whipped by a Kenwood mixer (using a whipper) at a high stirring speed to obtain a foamed chocolate. The specific gravity of the obtained foamed chocolate was measured and found to be 0.74. After the foamed chocolate was aged at 20°C for 1 week, the heat resistance of the chocolate was measured in the same manner as in Evaluation Example 1. The evaluation of the heat resistance of the foamed chocolates produced is collectively shown in Table 3. Evaluation of heat resistance Preservation temperature Evaluation Example 1 Evaluation Comparative Example 1 Evaluation Comparative Example 2 31°C 120g 30g 100g 32°C 20g 3g 30g 33°C 2g 0g 0g Feeling evaluation Melting-on-palate Good Good Stiff As shown in Table 3, the heat resistance of Evaluation Example 1 was improved as compared with that of Evaluation Comparative Example 1. Further, Evaluation Example 1 showed the same heat resistance as that of Evaluation Comparative Example 2 using conventional heat resistance fats. The mouth melt property of Evaluation Example 1 was same as that of Comparative Evaluation Example 1 and since Comparative Evaluation Example 2 used conventional heat resistant fats, inferiority in mouth melt could not be avoided. Consequently, it was found that using the present fats and oils gave a foamed chocolate having excellent melting-on-palate property and high heat resistance. Comparative Example 1 Ten parts of an oil mixture produced by mixing 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 58.5°C) of palm oil in the same manner as in Example 1 was added to 90 parts of a chocolate separately tempered in the same manner as in Example 1 and the resulting chocolate mixture was treated in the same manner as in Example 1. The specific gravity of the obtained chocolate was measured and found to be 1.10. Comparative Example 2 Ten parts of an oil mixture produced by mixing 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 65°C) of soybean oil in the same manner as in Example 1 was added to 90 parts of a chocolate separately tempered in the same manner as in Example 1 and the resulting chocolate mixture was treated in the same manner as in Example 1. The specific gravity of the obtained chocolate was measured and found to be 1.10. Comparative Example 3 Ten parts of an oil mixture produced by mixing 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rice bran oil in the same manner as in Example 1 was added to 90 parts of a chocolate separately tempered in the same manner as in Example 1 and the resulting chocolate mixture was treated in the same manner as in Example 1. The specific gravity of the obtained chocolate was measured and found to be 0.98. The characteristics of the foamed chocolates produced are collectively shown in Table 4. Results of Comparative Examples 1 to 3 No. Item Example 1 Example 2 Example 3 1 Edible fats and oils Slightly hydrogenated oil of rapeseed oil with low erucinic acid content Slightly hydrogenated oil of rapeseed oil with a low erucinic acid content Slightly hydrogenated oil of rapeseed oil with low erucinic acid content 2 Types of tri-saturated fatty acid glycerides or other high melting point fats and oils fully hydrogenated oil of palm oil fully hydrogenated oil of soybean oil fully hydrogenated oil of rice bran oil 3 Ratio of 1 to 2 90:10 90:10 90:10 4 Ratio of 3 to chocolate 10:90 10:90 10:90 5 oil content (%) of 4 40.6 40.6 40.6 6 specific gravity of 4 1.10 1.10 0.98 7 Content (%) of 2 in the total amount of chocolate 1 1 1 8 Temperature (°C) at the time of whipping 29 29 29 9 Workability Good Good Good 10 Taste feel Heavy feel Heavy feel Heavy feel Since the types of tri-saturated fatty acid glycerides used in Comparative Examples 1 to 3 were changed to use tri-saturated fatty acid glycerides containing no behenic acid as the constituent fatty acids, the specific gravity values of the chocolates were not reduced. Comparative Example 4 A mixture of 4 parts of the oil mixture produced in Example 1 and 96 parts of the tempered chocolate was whipped and the specific gravity of the resulting foamed chocolate was measured to found to be 0.93. Comparative Example 5 Five parts of an oil mixture produced by mixing 95 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 5 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content as the tri-saturated fatty acid glycerides containing behenic acid in the same manner as in Example 1 were added to 95 parts of a chocolate separately tempered in the same manner as in Example 1 and the resulting chocolate mixture was treated in the same manner as Example 1. The specific gravity of the obtained chocolate was measured and found to be 0.97. Comparative Example 6 Twenty parts of an oil mixture produced by mixing 80 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 20 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content as the tri-saturated fatty acid glycerides containing behenic acid in the same manner as in Example 1 were added to 80 parts of a chocolate separately tempered in the same manner as in Example 1 and the resulting chocolate mixture was treated in the same manner as in Example 1. However, the viscosity was extremely increased during the whipping and the chocolate mixture was hydrogenated. The specific gravity of the hydrogenated chocolate was measured and found to be reduced to 0.69, however the workability was inferior. The characteristics of the foamed chocolates produced are collectively shown in Table 5. Results of Comparative Example 4 to Comparative Example 6. No. Item Comparative Example 4 Comparative Example 5 Comparative Example 6 1 Edible fats and oils Slightly hydrogenated oil of rapeseed oil with low erucinic acid content Slightly hydrogenated oil of rapeseed oil with a low erucinic acid content Slightly hydrogenated oil of rapeseed oil with low erucinic acid content 2 Types of trisaturated fatty acid glycerides or other high melting point fats and oils fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content fully hydrogenated oil of rapeseed oil with a high erucinic acid content 3 Ratio of 1 to 2 90:10 95:5 80:20 4 Ratio of 3 to chocolate 4:96 5:95 20:80 5 oil content (%) of 4 36.6 37.3 47.2 6 specific gravity of 4 0.93 0.93 0.69 7 Content (%) of 2 in the total amount of chocolate 0.40% 0.25% 4.00% 8 Temperature (°C) at the time of whipping 30 30 30 9 Workability Good Good Inferior 10 Taste feel Heavy feel Heavy feel Good Since the contents of the tri-saturated fatty acid glycerides containing behenic acid in the chocolates of Comparative Example 4 and Comparative Example 5 were too small, the resulting chocolates were provided with insufficiently reduced specific gravity values and gave a taste feel not so much different from that of a conventional chocolate. In contrast with that, since the content of the tri-saturated fatty acid glycerides in the chocolate of Comparative Example 6 was too high, the specific gravity value of the chocolate was sufficiently decreased. However the chocolate was hydrogenated in the middle of its production. Comparative Example 7 Ninety parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content as the tri-saturated fatty acid glycerides containing behenic acid were completely melted. Ninety parts of a separately melted chocolate were added to 10 parts of the previously prepared oil mixture in melted state, cooled and tempered in the same manner as in Example 1. The tempered chocolate was whipped in the same manner as in Example 1 and the specific gravity of the obtained chocolate was measured and found to be 1.10. Comparative Example 8 After an oil mixture of 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content as the tri-saturated fatty acid glycerides containing behenic acid had been completely melted at 80°C, the oil mixture was left in a room and with the room temperature of 20°C spontaneously cooled and solidified for a whole day and night. Ninety parts of a sweet chocolate (Fuji Oil Co., Ltd., oil content 34%) separately tempered at the minimum point of 26°C and reheating point of 28°C was mixed with 10 parts of the previously prepared oil mixture and whipped in the same manner as in Example 1 and the specific gravity of the chocolate obtained was measured and found to be 0.97. Comparative Example 9 After an oil mixture of 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and 10 parts of a fully hydrogenated oil (iodine value 1 or lower, melting point 62°C) of rapeseed oil with a high erucinic acid content as the tri-saturated fatty acid glycerides containing behenic acid had been completely melted at 80°C, the oil mixture was quickly cooled to a product temperature of 10°C and mixed using a Combinator. Ten parts of the oil mixture was added to 90 parts of a chocolate tempered in the same manner as in Example 1 and further whipped in the same manner as in Example 1 and the specific gravity of the obtained chocolate was measured and found to be 1.04. The characteristics of the foamed chocolates produced are collectively shown in Table 6. Results of Comparative Example 7 to Comparative Example 9. No. Item Comparative Example 7 Comparative Example 8 Comparative Example 9 1 Edible fats and oils Slightly hydrogenated oil of rapeseed oil with low erucinic acid content Slightly hydrogenated oil of rapeseed oil with a low erucinic acid content Slightly hydrogenated oil of rapeseed oil with low erucinic acid content 2 Types of tri-saturated fatty acid glycerides or other high melting point fats and oils Fully hydrogenated oil of rapeseed oil with high erucinic acid Fully hydrogenated oil of rapeseed oil with high erucinic acid Fully hydrogenated oil of rapeseed oil with high erucinic acid 3 Ratio of 1 to 2 90:10 90:10 90:10 4 Ratio of 3 to chocolate 10:90 10:90 20:80 5 oil content (%) of 4 40.6 40.6 40.6 6 specific gravity of 4 1.10 0.97 1.04 7 Content (%) of 2 in the total amount of chocolate 1 1 1 8 Temperature (°C) at the time of whipping 30 30 39 9 Workability Good Good Good 10 Taste feel Heavy feel Heavy feel Heavy feel In the case of Comparative Example 7, since after being melted, the fats and oils of the mixture of fats and oils in a liquid state at 20°C and the tri-saturated fatty acid glycerides containing behenic acid were added to the chocolate, the specific gravity of the obtained chocolate was not reduced. In the case of Comparative Example 8 and Comparative Example 9, since the preparation methods for the oil mixtures of the slightly hydrogenated oils of rapeseed oil with a low erucinic acid content and the fully hydrogenated oils of rapeseed oil with a high erucinic acid content as tri-saturated fatty acid glycerides containing behenic acid were different from those of the examples, the specific gravity values of the obtained chocolates were not reduced. In the case of Comparative Example 8, this was assumed to be attributable to the reasons that although the crystal system of the oil mixture was supposed to be same as that of Example 1, the crystal size became large as compared with that of the oil mixture of Example 1 owing to the extremely slow cooling. In contrast with that, in the case of Comparative Example 9, it was assumed that the crystal system became different from that of Example 1 owing to the rapid cooling of the oil mixture and the crystal size was also assumed to be extremely fine, and as implied by the above description, it is believed to be impossible to easily add foams to a chocolate unless the crystal system and the crystal size are adjusted to be appropriate. Comparative Example 10 Rapeseed oil with a high erucinic acid content and containing 45% of unsaturated fatty acids of 22 carbon atoms was fully hydrogenated and the fully hydrogenated oil was hydrolyzed and esterified to obtain ethyl fatty acid esters. The ethyl fatty acid esters were fractionated to obtain a fraction containing 97.9% of saturated fatty acid esters with 20 to 24 carbon atoms, and 70 parts of such fatty acid esters were mixed with 30 parts of sunflower oil with a high oleic acid content and subjected to interesterification using enzymes selectively active on the 1- and 3- positions to obtain a reacted oil with an iodine value of 45 which was further fractionated with a solvent to obtain a high melting point fraction at 57.6% yield. The composition of the bonded fatty acids in the fraction was as follows. The composition had an iodine value of 31.6 and contained 76% of 2-unsaturated-1,3-disaturated glyceride and 71.2% of 2-unsaturated-1,3-disaturated glyceride composed of unsaturated fatty acids of 18 or more carbon atoms and saturated fatty acids of 20 to 24 carbon atoms. The fatty acid composition was as follows (the upper stage shows chain length : the number of double bonds; and the lower stage shows%) 16:0 18:0 18:1 18:2 20:0 22:0 24:0 0.7 1.7 31.6 2.5 4.8 56.7 2.0 Ten parts of the obtained fats and oils were mixed with 90 parts of a slightly hydrogenated oil (iodine value 95) of rapeseed oil with a low erucinic acid content and a foamed chocolate was then produced in the same manner as in Example 1 and the specific gravity of the produced chocolate was measured and found to be 1.16. The characteristics of the foamed chocolates produced are collectively shown in Table 7. Results of Comparative Example 10 No. Item Comparative Example 10 1 Edible fats and oils Slightly hydrogenated oil of rapeseed oil with low erucinic acid content 2 Types of tri-saturated fatty acid glycerides or other high melting point fats and oils Interesterified oil 3 Ratio 1 to 2 90:10 4 Ratio of 3 to chocolate 10:90 5 Oil content (%) of 4 40.6 6 Specific gravity of 4 1.16 7 Content (%) of 2 in the total amount of chocolate 1 8 Temperature (°C) at the time of whipping 29 9 Workability Good 10 Taste feel Heavy feel In the case of Comparative Example 10, although tri-glycerides containing behenic acid were employed in the constituent fatty acids, the composition of the main triglycerides was not of tri-saturated fatty acid tri-glycerides, so that the specific gravity of the obtained chocolate was not reduced. Industrial Applicability As described above, a foamed chocolate of the present invention can be produced by adding foams to a chocolate without requiring any emulsifiers or special apparatus and can be provided with lightened taste feel. Further, a foamed chocolate of the present invention has a high heat resistance.

Claims: A foamed chocolate comprising a formulation of an oil mixture comprising edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid. The foamed chocolate according to claim 1, wherein the behenic acid content in the tri-saturated fatty acid glycerides containing the behenic acid is 30% or higher. The foamed chocolate according to claim 1 or 2, wherein the tri-saturated fatty acid glycerides containing behenic acid are a fully hydrogenated oil of rapeseed oil with a high erucinic acid content. The foamed chocolate according to any one of claims 1 to 3, wherein a mixing ratio of the edible fats and oils to the tri-saturated fatty acid glycerides containing behenic acid in the oil mixture used is 85 : 15 to 95 : 5. The foamed chocolate according to any one of claims 1 to 4, wherein the content of the tri-saturated fatty acid glycerides containing behenic acid is 0.5 to 2% by weight based on the total amount of the foamed chocolate. The foamed chocolate according to any one of claims 1 to 5, wherein the specific gravity is 0.5 to 0.9. A process for producing a foamed chocolate which comprises steps of melting crystals of an oil mixture of edible fats and oils with tri-saturated fatty acid glycerides containing behenic acid by warming, then crystallizing the tri-saturated fatty acid glycerides containing behenic acid by cooling the oil mixture, adding the oil mixture in such a state to a blend of chocolate ingredients and whipping the resultant blend. The process according to claim 7, wherein fats and oils containing 30% or more of behenic acid in their saturated fatty acids are used as the tri-saturated fatty acid glycerides containing behenic acid. The process according to claim 7 or 8, wherein a fully hydrogenated oil or rapeseed oil with a high erucinic acid content is used as the tri-saturated fatty acid glycerides containing behenic acid. The process according to any one of claims 7 to 9, wherein the oil mixture is added and used so that the content of the tri-saturated fatty acid glycerides containing behenic acid becomes 0.5 to 2% by weight based on the total amount of the foamed chocolate. The process according to any one of claims 7 to 10, wherein the resultant blend is whipped until the specific gravity of chocolate becomes 0.5 to 0.9. The process according to any one of claims 7 to 11, wherein the resultant blend is whipped after the product temperature of the resultant blend is adjusted to 25°C to 40°C.

Inventors: KIDA HARUYASU, MATSUI MASAYUKI, OKOCHI MASAKO, KIDA, HARUYASU, MATSUI, MASAYUKI, OKOCHI, MASAKO, KIDA, Haruyasu, Fuji Oil Company, Limited, MATSUI, Masayuki, Fuji Oil Company, Limited, OKOCHI, Masako, Fuji Oil Company, Limited
Applicants: FUJI OIL CO LTD, FUJI OIL COMPANY, LTD.
Application year: 2000
Main classification: A23G1
IPC codes: A23D9, A23G1