FERMENTED MILK PRODUCT AND PROCESS

Abstract: Composite soft unripened curd fermented milk product in a pack in the form of a pot defining a filling volume comprising as distinct adjoining masses: at least one fermented milk base and at least one flavouring composition or at least two fermented milk bases, wherein the base(s) and the flavouring composition(s) are of contrasting colours, are arranged side by side and the interface between the contrasting base(s) and the flavouring composition(s) is a medium surface within the volume of the pot.

Description: Fermented milk product and process The subject of the present invention is a composite soft unripened curd fermented milk product in a pack and a process for producing it. Background of the invention Unripened Petit-Suisse type of cheese is traditionally prepared by curdling milk with lactic acid formed by lactic starter bacteria, separating the curd from the whey by centrifugal separators or draining the whey from the curd in bags, mixing cream to the drained curd and finally forming and packing optionally lined with paper in thermo formed pots. The forming operation can be carried out before packing or during packing in the case of stirred curd and in this latter case the form is given by the pot and the mass is dosed by means of a volumetric dispenser. In US-A-5 194 283 semi-hard ripened or unripened curd composite cheese products are manufactured by co-extrusion at a temperature of from 0 to 30° C. In the particular embodiment of two different unripened drained curds co-extrusion has limitations in the case of curd dosed into pots: in particular, one curd must predominantly surround the other and concentric extrusion is the best way to get a visually acceptable design pattern in the case where the different curds are of contrasting colours. There is a need for producing composite soft unripened curd fermented milk products of new visually attractive presentation which are appealing to the consumers, particularly to the kids and toddlers. Summary of the invention The invention thus concerns a composite soft unripened curd fermented milk product in a pack in the form of a pot defining a filling volume comprising as distinct adjoining masses: at least one fermented milk base and at least one flavouring composition or at least two fermented milk bases, wherein the base(s) and the flavoring composition(s) are of contrasting colours, are arranged side by side and the interface between the contrasting base(s) and flavouring composition(s) is a median surface within the volume of the pot. The invention also concerns a process for the production of the above product which comprises concomitantly side by side filling of the fermented milk base(s) and flavouring comρosition(s) into a pack in the form of a pot, wherein the base(s) and flavouring comρosition(s) are separately prepared, they are separately metered for filling substantially equivalent volumes of the pot at a temperature of from 0° C to 50° C and the viscosities of the said base(s) and flavouring composition(s) at the filling temperature are adjusted to values corresponding to from 5000 to 15000 mPa.s. Detailed description of the invention In the product of the invention, the contrasting masses in the pot adjoin at an interface. Thus if the product consists of an even number, e.g. two adjoining masses, they meet at a common median plane of symmetry. If the product consists of an odd number, e.g. three adjoining masses, they meet at a common vertical axis of symmetry. In some cases, filling can be carried out under rotation and the interface of the adjoining masses is then a twisted median surface in the pot. In the context of the invention, a fermented milk base may comprise unripened cheese curd. Unripened cheese curd may be obtained by known techniques. One conventional technique comprises curdling milk with lactic bacteria and rennet, separating whey by centrifugation or ultrafiltration and thus obtaining coagulated concentrated milk. Another conventional technique so called "direct curd" consists in first concentrating milk by ultrafiltration and/or addition of milk protein concentrate, adding lactic starters and rennet to the concentrated liquid to obtain a coagulated concentrated milk without draining. A fermented milk base may comprise other fermented products such as stirred yoghurt, fermented milk, fermented vegetable curd or fermented cereal whenever necessary together with a stabilizer to obtain a gellified mass of required viscosity. The fermented milk base may comprise added fats which can be milk fat, vegetable fats or mixtures of such fats, particularly vegetable fats providing essential fatty acids such as linoleic and alpha-linolenic acids. A flavouring composition may be of savoury nature and contain salt, spices, herbs, flavourings, colourants, purees or pieces of vegetables, cereals. A flavouring composition may be of a sweet nature and contain sugar, honey, syrup, flavourings, colourants, pulps or pieces of fruit, which latter may be dried, preserved or candied, cereals. It can be a compote, jam, marmalade, preserve. The flavouring composition is advantageously stabilized with suitable stabilizers giving to it the necessary consistency for extrusion. Preferred stabilizers comprise food gums, such as e.g. locust bean gum, guar gum, xanthan gum, starches, preferably short texture native or modified starch and pectin, used individually or in admixture. The texture of the fermented base must be stable during time and compatible with side by side filling. It has been found that viscosity of the fermented milk base and the flavouring composition as components of the composite product is a key parameter for side by side filling the product into pots. Thus a viscosity of from 5000 to 15000 mPa.s using a Brookfield type viscometer at 10° C, 50 rpm/disk 5 gives satisfactory results. Preferably, the global viscosities of the different components of the composite product are about the same. Thus the present product may consist of a fermented milk base and a flavouring composition. In another embodiment, the product may consist of two distinct fermented milk bases which can also be flavoured. Preferably, a fermented milk base comprises: from 50 to 70 % by weight lactic curd of plastic consistency of about 12 to 22 % dry matter by weight, from 5 to 20 % by weight cream and from 10 to 30 % by weight of a sweet or fruit preparation. The sweet or fruit preparation in the fermented milk base preferably comprises a stabilizer. Preferred stabilizers comprise food gums, such as e.g. locust bean gum, guar gum, xanthan gum, starches, preferably short texture modified starch and pectin, used individually or in admixture. The amount of stabilizer used preferably is from 0.5 to 2 % by weight and most preferably from 0.5 to 1.5 % by weight of the sweet or fruit preparation. Thus, the viscosity value of the preferred fermented milk base may be obtained by adapting the viscosity of the sweet or fruit preparation to preferably from 4000 to 8000 mPa.s. (Brookfield, 25° C/15 s, 50 rpm/disk 5). The feπnented milk bases have a high amount of proteins and carbohydrates. They may be enriched in vitamins, e.g. A, E, D and C and minerals, e.g. Calcium, Potassium. This is important for children, particularly toddlers who have specific nutritional needs due to their physiology requiring more energy, proteins and nutrients. Side by side filling provides for very interesting organoleptic and nutritional advantages. Contrasting colours may be associated with contrasting taste sensations. At consumer's choice, the different products may be consumed the one after the other. From the nutritional point of view, since the fermented milk bases are stabilized and in juxtaposed layers there is no substantial migration of ingredients from one base to the other. Thus the fermented bases may contain probiotic strains in one base and dietary fibers, especially prebiotics in the form of soluble fibers which help in building healthy intestinal flora and prevent digestive problems in the other base. The fermented milk bases may also be aerated to lighten their texture. An aerated curd thus assumes the form of a cheese mousse. Such a mousse preferably contains from 0.5 to 3 % by weight of a stabilizer or of a stabilizer/emulsifier blend typically used in ice creams. The curd is preferably aerated to an overrun of up to 120 %, most preferably of from 50 to 120 % with an inert gas, for example nitrogen. The fermented milk bases may contain inclusions such as pieces of fruit or flavourings, for example cocoa or chocolate. In a prefeπed way for carrying out the process of the invention, two distinct fennented milk bases or one fermented milk base and one flavouring composition, for example two moist unripened cheese curds of plastic consistency are fed, for example by single or double Archimedes screws, or by any other positive pump to hoppers, which can be pressurized. From the hoppers controlled valves allow feeding of the two masses to dosing cylinders and from there by dosing pistons through pipes to filling head comprising two essentially parallel and vertical filling nozzles and from there into pots carried by a conveyor belt or chain moving step by step underneath. In this case the filling of a pot consists of two half-portions and each half-portion is metered by means of a portion control mechanism. This mechanism may preferably comprise upstream of the nozzle a connecting pipe through which the product is delivered to the nozzle and which may be closed and opened by means of a controlled valve. The valve is upstream of a passage in the nozzle. Preferably, the valves are resilient membranes which are controlled by air pressure. The metering chambers consist of the piston cylinders and the pipe section upstream of the membranes. Thus the passageways including the connecting pipes and the passages in the nozzles are preferably optimised in order to provide symmetric flow paths for the distinct products forming the half portions for improved filling accuracy whilst limiting steric hindrance and providing for a compact design of the filling head. Preferably, the dosing pistons are driven individually to allow for adjustment of dosing speed, by means of a variator of the dosing piston driving motor. This can provide for slightly delayed filling of one mass respective to the other for accurate side by side filling when the viscosities of the masses are not exactly the same. The pots are presented under the filling head. For proper filling without any air pockets being foπned, the filling head preferably is mounted on an up-and-down device by which the nozzles descend into the pots in proximity of their bottoms and fill them while they are lifted. Thus the connecting pipes between the dosing cylinders and the nozzles are flexible. During the filling operation the pots are stationary. After being filled the pots advance one step. A pair of filling nozzles which deliver each a half-portion into a pot may be mounted on a rotary joint thus providing two complementary half-portions of spiral shape. In a variant, a device, for example a permanently rotating plate placed beneath the conveyor may lift the pot so that it surrounds the nozzles and impart a downward spinning movement to it during the filling process, the filling head remaining stationary. The pots used may be of cylindrical or frustoconical shape with a circular, oval or square opening or e.g. frustoconical with an opening in the form of a stylized heart. The pots may be opaque or advantageously transparent to show the contrasted layers. The filling volume may be preferably of from 20 to 200 cm . Preferably, the pots are in multiple packs and thermoformed, filled and sealed with lids in a fonn-fill-seal equipment. Examples The following Examples illustrate the invention. In these Examples, percentages and parts are by weight, unless otherwise stated. Example 1 Preparation of fruit Petit Suisse. fermented base 1 Unripened curd was prepared in a standard way from skimmed milk standardised to 10 % solids non fat, pasteurized, cooled to ambient temperature and inoculated with mesophilic lactic starter, CaC12 and rennet. After fermentation to pH 4.5-4.6 the curd was broken into small pieces, them ised for a few min., cooled and drained by centrifugation to 16.2 % total solids. A strawberry fruit preparation was obtained by melting frozen fruit and mixing with granulated sucrose, stabilizers, citric acid, whey and water. After pasteurization, the mixture was cooled to 65° C, colourings, flavourings, potassium sorbate and vitamins were added. The fruit preparation contained 63.5 % dry matter (Brix refractometer) and was stabilized with 1.5 % of a mixture of locust bean gum (LBG) and short texture modified starch, containing predominantly locust bean gum. The fruit preparation had a viscosity of 5496 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). To 63 % of the preceding curd was added 10 % pasteurized cream containing 45 % fat and 27 % preceeding fruit preparation and the mixture was cooled to 10° C in a plate heat exchanger. The fermented base had a total solids content of 30.5 % and a viscosity of 9.200 mPas at 10° C (filling temperature). Preparation of plain Petit Suisse. fermented base 2 Plain Petit Suisse was prepared as for the strawberry flavoured version but without frozen fruit, colouring and flavouring in the sweet preparation added to the curd and cream, replacing them by whey. The added preparation contained 64.1 % dry matter (° Brix) and had a viscosity of 5512 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). To 63 % of the preceding curd was added 10 % pasteurized cream containing 45 % fat and 27 % preceeding sweet preparation and the mixture was cooled in a plate heat exchanger. The fennented base had a total solids content of 29.9 % and a viscosity of 9050 mPa.s at 10° C (filling temperature). Preparation of the composite products Both masses of fennented bases 1 and 2 were fed to pressurized hoppers which pressure was controlled individually and dosed into thermoformed frustoconical pots of plastic material containing 65 g of product with openings in the form of a stylized heart with a form- fill-seal filling machine. Filling of pots caπied by a step by step conveyor was carried out by parallel nozzles in a flexible filling head provided with a device for up-and-down movement, comprising entering the nozzles into the pots for filling, and lifting the nozzles out of the pots after filling. The filling time was about 0.8 s. Membrane dosing pumps with common motor drive control were used for simultaneously side -by-side filling of both masses. The masses were distributed by flexible connecting pipes to the nozzles. The products had a pleasant appearance with well-defined medium separation plan between the two contrasting red and white masses. Example 2 The process of Example 1 was carried out with similar results, the difference being that the fruit preparation (fermented mass 3) and the sweet preparation (fermented mass 4) of the fermented masses were stabilized with 0.75 % calcium reactive pectin dissolved in hot water. The added fruit preparation of fermented mass 3 contained 64.1 % dry matter (° Brix) and had a viscosity of 6440 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). The added sweet preparation of fermented mass 4 contained 64.1 % dry matter (° Brix) and had a viscosity of 7631 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). Example 3 The process of Example 1 was caπied out with similar results with two fruit preparations, fermented masses 5 and 6. In fermented mass 5, strawberry flavoured and in fermented mass 6, banana flavoured the fruit preparations were stabilized with 0.6 % of a mixture of LBG and xanthan gum where LBG was predominant. In addition, the masses contained 2.5 % added calcium from added lactic mineral concentrate , coπesponding to 240 mg calcium per 100 g product. The added fruit preparation of fermented mass 5 contained 66.5 % dry matter (° Brix) and had a viscosity of 8980 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). The added sweet preparation of fermented mass 6 contained 66.5 % dry matter (° Brix) and had a viscosity of 8640 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). In addition, calcium stability was good in accelerated storage tests after 7 days storage at 30° C. Example 4 The process of Example 1 was caπied out with similar results using plain Petit Suisse and fruit compote for the preparation of the composite product. The plain unripened cheese composition was similar to the indications given in Example 1 (feπnented base 2). The fruit compote was composed of 82 % fruit, 16 % sucrose and 2 % stabilizer mix of LBG and pectin. The fruit compote viscosity was 9100 mPa.s (Brookfield, 25° C/15 s, 50 rpm/disk 5). Example 5 The process of Example 1 was carried out with similar results using as feπnented milk bases milk feπnented at 40° C with thermophilic lactic bacteria (Lactobacillus bulgaricus, Streptococcus thermophilus), one flavoured with a first fruit preparation (fermented mass 7) and the other with a distinct fruit preparation (fennented mass 8). The fermented milk bases had the following composition: Ingredient % Milk (3.5 % fat) 72.8 Skimmed milk powder 3 Starter culture 3 Sucrose 10 Fruit preparation 10 Stabilizer (0.7 % gelatine and 0.5 % starch) 1.2

Claims: Claims 1. Composite soft unripened curd feπnented milk product in a pack in the form of a pot defining a filling volume comprising as distinct adjoining masses: at least one fermented milk base and at least one flavouring composition or at least two feπnented milk bases, wherein the base(s) and the flavoring composition(s) are of contrasting colours, are aπanged side by side and the interface between the contrasting base(s) and flavouring composition(s) is a median surface within the volume of the pot. 2. Product according to claim 1 comprising two distinct adjoining masses. 3. Product according to claim 2, wherein both distinct adjoining masses are feπnented milk bases. 4. Product according to claim 2 or 3, in which a fermented milk base comprises: from 50 to 70 % by weight lactic curd of plastic consistency of about 12 to 22 % dry matter by weight, from 5 to 20 % by weight cream and from 10 to 30 % by weight of a sweet or fruit preparation. 5. Product according to claim 4, in which the sweet or fruit preparation in the fennented milk base is stabilized with a stabilizer in an amount of preferably from 0.5 to 2 % by weight and most preferably from 0.5 to 1.5 % by weight of the sweet or fruit preparation to get the suitable stabilization for side by side filling. 6. Product according to claim 1, wherein the fermented milk base is aerated to up to 120 % overrun. 7. Product according to any preceding claim, wherein the global viscosities of the distinct adjoining masses of the composite product is from 5000 to 15000 mPa.s. 8. Product according to claim 7, wherein the global viscosities of the distinct adjoining masses of the composite product are about the same. 9. Process for the production of the product of claim 1, which comprises concomitantly side by side filling of the fermented milk base(s) and flavouring composition(s) into a pack in the form of a pot, wherein the base(s) and flavouring composition(s) are separately prepared, they are separately metered for filling substantially equivalent volumes of the pot at a temperature of from 0° C to 50° C and the viscosities of the said base(s) and flavouring composition(s) at the filling temperature are adjusted to values coπesponding to from 5000 to 15000 mPa.s. 10. Process according to claim 9, comprising feeding two distinct masses of plastic consistency to hoppers, in which controlled valves allow feeding of the two masses to dosing cylinders and from there by dosing pistons through pipes to a filling head comprising two essentially parallel and vertical filling nozzles and from there into pots caπied by a conveyor belt or chain moving step by step underneath, and in which the filling of a pot consists of two half-portions and each half- portion is metered by means of a portion control mechanism. 11. Process according to claim 10, in which the portion control mechanism comprises upstream of the nozzle a connecting pipe through which the product is delivered to the nozzle and which may be closed and opened by means of a controlled valve, in which the valve is upstream of a passage in the nozzle, the metering chambers consist of the piston cylinders and the pipe section upstream of the valve and in which the passageways including the connecting pipes and the passages in the nozzles provide symmetric flow paths for the distinct masses forming the half-portions for improved filling accuracy whilst limiting steric hindrance and providing for a compact design of the filling head. 12. Process according to claim 10, wherein the dosing pistons are driven individually to allow for adjustment of dosing speed, by means of a variator of the dosing piston driving motor, which provides for slightly delayed filling of one mass respective to the other for accurate side by side filling when the viscosities of the masses are not exactly the same. 13. Process according to claim 10, wherein for proper filling without any air pockets being foπned, the filling head preferably is mounted on an up-and-down device by which the nozzles descend into the pots in proximity of their bottoms and fill them while they are lifted. 14. Process according to any of claims 10 to 13, wherein filling of the pot is caπied out under rotation.

Inventors: DUPAS CHRISTIAN, MESSERLI ALFRED, PETERMANN ROBERT, DUPAS, CHRISTIAN, MESSERLI, ALFRED, PETERMANN, ROBERT
Applicants: DUPAS CHRISTIAN, MESSERLI ALFRED, NESTLE SA, PETERMANN ROBERT, DUPAS, CHRISTIAN, MESSERLI, ALFRED, PETERMANN, ROBERT, SOCIETE DES PRODUITS NESTLE S.A.
Application year: 2000
Main classification: A23C19
IPC codes: A23C9, A23C19, B65B3, B65D77