Abstract:
Highly purified Stevioside and Rebaudioside A were prepared from sweet glycoside extracts obtained from  Stevia rebaudiana  Bertoni leaves. The resulting sweeteners are suitable as non-calorie, non-carcinogenic, non-bitter, non-lingering sweeteners, which may be advantageously applied in foods, beverages, and milk products.

Description:
RELATED APPLICATIONS 
     This application is a continuation-in-part application of U.S. patent application Ser. No. 11/246,152, filed Oct. 11, 2005 now U.S. Pat. No. 7,862,845. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a process for producing a highly purified Stevioside and Rebaudioside A from the extract of the  Stevia rebaudiana  Bertoni plant and use thereof in various food products and beverages. 
     2. Description of the Related Art 
     In view of food sanitation, the use of artificial sweeteners such as dulcin, sodium cyclamate and saccharin has been restricted. However natural sweeteners have been receiving increasing demand.  Stevia rebaudiana  Bertoni is a plant that produces an alternative sweetener that has an added advantage of being a natural plant product. In addition, the sweet steviol glycosides have functional and sensory properties superior to those of many high potency sweeteners. 
     The extract of  Stevia rebaudiana  plant contains a mixture of different sweet diterpene glycosides, which have a single base—steviol and differ by the presence of carbohydrate residues at positions C13 and C19. These glycosides accumulate in Stevia leaves and compose approximately 10%-20% of the total dry weight. Typically, on a dry weight basis, the four major glycosides found in the leaves of Stevia are Dulcoside A (0.3%), Rebaudioside C (0.6%), Rebaudioside A (3.8%) and Stevioside (9.1%). Other glycosides identified in  Stevia  extract include Rebaudioside B, C, D, E, and F, Steviolbioside and Rubusoside. 
     The physical and sensory properties are well studied only for Stevioside and Rebaudioside A. They were tested for stability in carbonated beverages and found to be both heat and pH stable (Chang and Cook, 1983). The sweetness potency of Stevioside is around 210 times higher than sucrose, Rebaudioside A in between 200 and 400 times, and Rebaudioside C and Dulcoside A around 30 times (Phillips, 1989 and Tanaka, 1997). 
     However, apart from its high level of sweetness, they have also intrinsic properties of post-bitter taste and unpleasant and undesirable aftertaste. Some undesirable taste characteristics of glycosides can be as a result of contamination of other substances, presented in extract. 
     One of the main ways to improve the taste quality is the enzymatic glycosylation of mixture of semi-purified steviol glycosides. Another way to produce highly purified individual glycosides with standard characteristics and minimal content of accompanying compounds. 
     The invention related to the purification of two main glycosides—Stevioside and Rebaudioside A and use thereof. 
     A process for the recovery of diterpene glycosides, including Stevioside from the  Stevia rebaudiana  plant is described (U.S. Pat. No. 4,361,697). A variety of solvents, having different polarities, were used in a sequential treatment that concluded with a high performance liquid chromatographic (HPLC) separation procedure. 
     A method for the recovery of Rebaudioside A from the leaves of  Stevia rebaudiana  plants has been developed (U.S. Pat. No. 4,082,858). Again, final purification is achieved by liquid chromatography subsequent to an initial extraction with water and an alkanol having from 1 to 3 carbon carbons, preferably methanol. It is also known that water may be used as the initial solvent; their preferred solvent at this stage is a liquid haloalkane having from 1 to 4 carbon atoms. The preferred second solvent is an alkanol having from 1 to 3 carbon atoms, while the preferred third solvent is an alkanol having from 1 to 4 carbon atoms and optionally minor amounts of water. 
     Individual sweet glycosides can be obtained from the  Stevia rebaudiana  plant. A mixture of sweet glycosides extracted from the  Stevia rebaudictna  plant is processed to remove impurities by using two types of ion-exchangers. After removing the mixed sweet glycosides from the second column with methanol, the solution is dried. Upon refluxing the dried solids in a methanol solution and then cooling the solution, Stevioside precipitates out. The filtrate is further concentrated and cooled to precipitate out Rebaudioside A. This Rebaudioside A can be further purified as can the previously obtained Stevioside (U.S. Pat. No. 5,962,678). However, a large amount of toxic organic solvent, such as methanol is used. 
     However, all the above-mentioned methods allow the production of Stevioside and Rebaudioside A not in highly purified grade, which further possess a residual bitterness and aftertaste. 
     On the other hand, the unfavorable taste of the glycosides can be as a result of contamination of impurities, presented in extract. Highly purified Stevioside and Rebaudioside A possessing an improved taste profile and there is a need to provide an easy and commercially valuable process for the manufacturing the highly purified Stevioside and Rebaudioside A, and use thereof in various beverages and food products. 
     SUMMARY OF INVENTION 
     An object of the present invention is to provide a commercially valuable process for producing a highly purified sweetener from the extract of  Stevia rebaudiana  Bertoni plant and use thereof in various food products and beverages, which overcomes the disadvantages of the related art. 
     The invention, in part, pertains to the dried and powdered leaves being subjected to water extraction and the resulted extracts is purified using treatment with a base such as calcium hydroxide and then iron chloride. The filtrate was deionized on, e.g., Amberlite FPC23H, Amberlite FPA51, and Amberlite FPA98Cl. The filtrate is concentrated under vacuum and spray dried. The isolation and purification of Stevioside and Rebaudioside A were developed using alcoholic precipitation and ultrafiltration. The highly purified Stevioside and Rebaudioside A were obtained. Any type of existing  Stevia  extract with various ratio of sweet glycosides are feasible. 
     The highly purified glycosides were applied in various foods and beverages as sweetener. 
     The invention, in part, pertains to a purified sweet glycosides extract produced from the  Stevia rebaudiana  plant, wherein the main sweet glycosides are Rebaudioside A and Stevioside, obtained by a process including drying  Stevia rebaudiana  leaves, treating the leaves to extract an aqueous liquid solution containing mixed sweet glycosides, extracting the  Stevia rebaudiana  leaves, obtaining an extract, filtering the extract, obtaining a filtrate, treating the filtrate with a base such as calcium hydroxide, treating the extract with trivalent iron chloride, desalting, decolorizing, and evaporating the filtrate to dryness. 
     In the invention, purified Rebaudioside A and Stevioside can be obtained by dissolving sweet glycosides in methanol at ambient temperatures to precipitate Stevioside, filtering the solution to recover a precipitate of Stevioside, purifying, recovering a high purity Stevioside, concentrating the remaining solution and evaporating to dryness, suspending the powder in ethanol, heating and then cooling the solution to precipitate Rebaudioside A. Suspending the crystalline Rebaudioside A obtained in ethanol-water solution at cool conditions (10-12° C.) prepares a high purity of Rebaudioside A. Stevioside or Rebaudioside A has a purity of at least 98%. Applications are found in various foods such as chocolate, ice cream, beverage, dairy products, as a sweetener in a tablet form. 
     It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the embodiments of the invention. 
         FIG. 1  shows a sensory evaluation of raw  Stevia  extract, Stevioside, and Rebaudioside A; 
         FIG. 2  shows a sensory evaluation of Stevioside with a different grade of purity; and 
         FIG. 3  shows a sensory evaluation of Rebaudioside A with a different grade of purity; 
     
    
    
     DETAILED DESCRIPTION 
     Advantages of the present invention will become more apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
     The dried leaves of  Stevia rebaudiana  Bertoni were extracted by 10 volumes of water. The proportion of extraction water preferably was about 5 liters to about 15 liters (pH 6.0 to 7.0) to one kilogram of leaves. Greater volumes of solvent can be used, however, it was not preferable from the practical standpoint. The duration of extraction may be from 0.5 hours to 24 hours, with a period of from about 1 hours to about 6 hours preferred. 
     The extraction temperature can be in the limits of 25-90° C., however the temperatures between 45-75° C. are more preferable. 
     The plant material was separated from the solution by filtration, and the pH of the filtrate was adjusted to about 10 with calcium hydroxide and heated between 40-60° C., preferably from 50° C. to 55° C., for about 0.5-1.0 hours, cooled to ambient temperature with slow agitation, and neutralized by FeCl 3 . After mixing for 10-15 minutes, the precipitate was removed by filtration; the filtrate was passed through the Celite, deionized, and decolorized by Amberlite FPC23H, Amberlite FPA51, and Amberlite FPA98Cl by conventional manner. The solution was concentrated and spray dried. 
     The yellow powder had a content of 14% Dulcoside, 64.6% Stevioside, 6.7% Rebaudioside C and 25.3% Rebaudioside A. 
     An HPLC analysis of the obtained product was carried out using an Agilent Technologies 1100 Series (USA) equipped with Zorbax-NH 2  column using acetonitrile-water gradient from 80:20, v/v (2 minutes) to 50:50, v/v during 70 minutes and UV detector at 210 nm. 
     The obtained powder was dissolved in methanol and maintained at a temperatures 20-50° C., preferably at 20-25° C., for 0.5-6.0 hours, preferably 0.5-1.0 hours with agitation. The proportion of extract and methanol was between 1:2-1:7, w/v, preferably 1:5. During this time the precipitate was formed, which was filtered and dried. According to the HPLC analysis, the powder contents were around 90-91% of Stevioside. A second treatment by methanol was not efficient to prepare high purity Stevioside. 
     For the further purification, the powder was mixed with two volumes of 90% of ethanol and at 10-12° C. and maintained for about 30 minutes with slow agitation. The precipitate was separated by filtration and dried under vacuum. The Stevioside with about 98.5-99.4% purity was obtained. 
     The filtrates were combined and used for recovery of Rebaudioside A. For this purpose the remaining solution was evaporated to remove the methanol, the syrup obtained diluted with water and passed through polysulfone based ultrafiltration membranes (with a filtering discrimination of 2.5 kDa) (Liumar Technologies, Ottawa, Canada) with diafiltration. The filtrate was concentrated and spray dried. The obtained powder was mixed with 96.2% ethanol and maintained at 45-50° C. for about 30 minutes with agitation. The proportion of syrup and ethanol was between 1:2-1:7, w/v, preferably 1:5. During this time the precipitate was formed, which was filtered and dried. Rebaudioside A with 88-90% purity was obtained. For the further purification the powder was mixed with two volumes of 92% ethanol and maintained at 10-12° C. for about 60 minutes with slow agitation. The crystals were filtered and dried. Rebaudioside A with 98.9% purity was obtained. 
     Based on the results of preliminary test on the sweetening power of the sweeteners, aqueous solutions of commercial  Stevia  extract (0.05%) commercialized by Ganzhou Julong High-Tech Food Industry Co., Ltd (China), Stevioside (0.07%), and Rebaudioside A (0.028%) were prepared. 
     The organoleptic test was carried out with 30 previously trained panel members. It was observed that Rebaudioside A has the highest sweetness level (5.96), followed by Stevioside with a mean score of 4.62, and commercial  Stevia  extract had the lowest mean score of 2.96. Rebaudioside A had the lowest score for bitterness (1.76), and commercial  Stevia  extract was the most bitter compared to the other samples. For overall acceptability, Rebaudioside A had the highest score of 4.05 followed by Stevioside (3.81) and raw extract (3.16) ( FIG. 1 ). 
     The taste profile of Stevioside with 99.3% of purity was more preferable as compared with 90.2 and 95.4% ( FIG. 2 ). The similar feature was obtained for Rebaudioside A with various grades of purity ( FIG. 3 ). 
     The highly purified sweeteners can be favorably used for seasoning various food products (for instance, soy sauce, soy sauce powder, soy paste, soy paste powder, dressings, mayonnaise, vinegar, powdered vinegar, bakery products and confectioneries, frozen-desserts, meat products, fish-meat products, potato salad, bottled and canned foods, fruit and vegetables) in intact or mixed forms with other sweeteners, such as corn syrup, glucose, maltose, sucrose, lactose, aspartame, saccharin, sugar alcohols, organic and amino acids, flavors and/or coloring agents. 
     The products are favorably usable as a low-carcinogenic and low-calorie sweetener because it is less fermentable by oral dental-caries causative microorganisms. Exemplary applications include low-carcinogenic food products such as confectioneries including chewing gum, chocolate, biscuits, cookies, toffee and candy. Additionally applications include soft drinks such as coffee, cocoa, juice, carbonated drinks, sour milk beverage, yogurt drinks and alcoholic drinks, such as brandy, whisky, vodka and wine. In addition to the above-described uses, the sweeteners are usable for sweetening drugs and cosmetics. 
     The following examples illustrate preferred embodiments of the invention. 
     EXAMPLE 1 
     Extraction of Sweet Glycosides 
     The leaves of  Stevia rebaudiana  are dried at 55° C. for three hours in a vacuum oven and powdered (30 mesh). One kg of the obtained material was mixed with 10 liters of water (pH 6.5) and heated to 55° C. with slow agitation for 10 hours. The plant material was separated from the solution by filtration and the pH of the filtrate was adjusted to 10 with about 24 grams of calcium hydroxide and heated to 50° C. for 0.5 hours. The obtained mixture was cooled to ambient temperature and the pH was adjusted to about 7.0 by about 53 grams of FeCl 3 . After mixing for 15 minutes the precipitate was removed by filtration. 
     The slightly yellow filtrate was passed through the Celite, deionized, and decolorized by conventional manner on Amberlite FPC23H, Amberlite FPA51, and Amberlite FPA98Cl commercialized by ROHM &amp; HAAS Co., Germany. The solution was concentrated and spray dried. The yield was 122 grams of powder with a content of sweet glycosides to about 91%. The mixture contains 3.4% Dulcoside, 64.6% Stevioside, 6.7% Rebaudioside C and 25.3% Rebaudioside A. 
     EXAMPLE 2 
     Preparation of Stevioside 
     100 grams (on the base of dry material) of the powder obtained by the process of EXAMPLE 1 was mixed with 0.5 liters of methanol and maintained at 25° C. for 45 minutes with slow agitation. The precipitate Stevioside was filtered and dried. 61.2 grams of Stevioside with 90.6% purity was obtained. 
     For the further purification the powder was mixed with two parts of 90% of ethanol, and maintained at 10-12° C. for about 30 minutes with slow agitation. The precipitate was separated by filtration and dried under vacuum. The product weighed 58.8 grams and contained 99.3% Stevioside. 
     EXAMPLE 3 
     Preparation of Rebaudioside A 
     The remaining solutions after separation of Stevioside (EXAMPLE 2) were combined, and methanol was removed by evaporation. The syrup was diluted with water and passed through polysulfone based ultrafiltration membranes (with a filtering discrimination of 2.5 kDa) (Liumar Technologies, Ottawa, Canada) with diafiltration. The filtrate was concentrated and spray dried. 40.8 grams of powder with content of Rebaudioside A of around 60% were obtained. The powder was mixed with five volumes (w/v) of 96.2% ethanol and maintained at 50° C. for 30 minutes with slow agitation. The precipitate was filtered and dried. Rebaudioside A with 89.8% purity was obtained. The powder was mixed with two volumes of 92% of ethanol and maintained at 12° C. for 60 minutes with slow agitation. The crystals were filtered and dried. 23.6 grams of Rebaudioside A of 98.9% purity was obtained. 
     EXAMPLE 4 
     Low-Calorie Orange Juice Drink 
     Orange concentrate (35%), citric acid (0.38%), ascorbic acid (0.05%), sodium benzoate (0.02%), orange red color (0.01%), orange flavor (0.20%), and sweetener (0.06%) containing 90.2, 95.4 or 99.3% of Stevioside, or 80, 90, or 98.9% of Rebaudioside A were blended and dissolved completely in the water (up to 100%) and pasteurized. The sensory evaluation of the samples is summarized in the TABLE 1. The data shows that best results were obtained for highly purified Rebaudioside A and Stevioside. 
     
       
         
               
               
             
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
             
             
               
                   
                   
               
               
                   
                 Comments 
               
             
          
           
               
                 Sample 
                 Flavor 
                 Aftertaste 
                 Mouth feel 
               
               
                   
               
               
                 Stevioside - 
                 Sweet and balanced flavor 
                 Slight bitterness in 
                 Acceptable 
               
               
                 90.2% 
                   
                 aftertaste 
               
               
                 Stevioside - 
                 Sweet and balanced flavor 
                 Slight bitterness in 
                 Acceptable 
               
               
                 95.4% 
                   
                 aftertaste 
               
               
                 Stevioside - 
                 Sweet, pleasant, balanced flavor 
                 Clean, no bitterness 
                 Quite full 
               
               
                 99.3% 
               
               
                 Rebaudioside 
                 Sweet, rounded and balanced 
                 Almost no any 
                 Acceptable 
               
               
                 A - 80.0% 
                 flavor 
                 bitterness 
               
               
                 Rebaudioside 
                 Sweet, rounded and balanced 
                 Almost no any 
                 Full 
               
               
                 A - 90.0% 
                 flavor 
                 bitterness 
               
               
                 Rebaudioside 
                 High quality of sweetness, 
                 Clean, no unpleasant 
                 Quite full 
               
               
                 A - 98.9% 
                 pleasant, taste similar to 
                 aftertaste 
               
               
                   
                 sucrose, balanced flavor 
               
               
                   
               
             
          
         
       
     
     By the same way can be prepared juices from other fruits, such as apple, lemon, apricot, cherry, pineapple, etc. 
     EXAMPLE 5 
     Low-Calorie Carbonated Lemon-Flavored Beverage 
     The formula for the beverage was as below: 
     
       
         
               
               
               
             
               
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredients 
                 Quantity, kg 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Sugar 
                 30.0 
                   
               
               
                   
                 Sweetener 
                 0.4 
               
               
                   
                 Citric acid 
                 2.5 
               
               
                   
                 Green tea extract 
                 25.0 
               
               
                   
                 Salt 
                 0.3 
               
               
                   
                 Lemon tincture 
                 10.0 
                 L 
               
               
                   
                 Juniper tincture 
                 8.0 
                 L 
               
               
                   
                 Sodium benzoate 
                 0.17 
               
               
                   
                 Carbonated water 
                 up to 1000 
                 L 
               
               
                   
                   
               
             
          
         
       
     
     Sensory and physicochemical characteristics of the drink are presented in the TABLE 2. 
     The drinks with highly purified Rebaudioside A and Stevioside were superior with an excellent flavor and taste. 
     
       
         
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE 2 
               
             
             
               
                   
                   
               
               
                   
                 Characteristics 
               
             
          
           
               
                   
                   
                 Stevioside - 
                 Rebaudioside 
                 Rebaudioside 
               
               
                 Item 
                 Stevioside - 90.2% 
                 99.3% 
                 A - 90.0% 
                 A - 98.9% 
               
               
                   
               
               
                 Appearance 
                 Transparent liquid, 
                 Transparent 
                 Transparent 
                 Transparent 
               
               
                   
                 free of sediment 
                 liquid, free of 
                 liquid, free of 
                 liquid, free of 
               
               
                   
                 and strange 
                 sediment and 
                 sediment and 
                 sediment and 
               
               
                   
                 impurities. A light 
                 strange 
                 strange 
                 strange 
               
               
                   
                 opalescence, caused 
                 impurities. A 
                 impurities. A 
                 impurities. A 
               
               
                   
                 by features of used 
                 light 
                 light 
                 light 
               
               
                   
                 raw materials is 
                 opalescence, 
                 opalescence, 
                 opalescence, 
               
               
                   
                 possible. 
                 caused by 
                 caused by 
                 caused by 
               
               
                   
                   
                 features of 
                 features of 
                 features of 
               
               
                   
                   
                 used raw 
                 used raw 
                 used raw 
               
               
                   
                   
                 materials is 
                 materials is 
                 materials is 
               
               
                   
                   
                 possible. 
                 possible. 
                 possible. 
               
               
                 Color 
                 From light yellow up to 
                 From light 
                 From light 
                 From light 
               
               
                   
                 yellow 
                 yellow up to 
                 yellow up to 
                 yellow up to 
               
               
                   
                   
                 yellow 
                 yellow 
                 yellow 
               
               
                 Taste 
                 Sour-sweet, some 
                 Sour-sweet, 
                 Sour-sweet, 
                 Sour-sweet, 
               
               
                   
                 bitterness in 
                 expression of 
                 almost no any 
                 expression of 
               
               
                   
                 aftertaste 
                 sweetness is 
                 bitterness, 
                 sweetness is 
               
               
                   
                   
                 rapid. The 
                 expression of 
                 rapid. 
               
               
                   
                   
                 taste is 
                 sweetness is 
               
               
                   
                   
                 satisfactory. 
                 rapid. 
               
               
                   
               
             
          
         
       
     
     EXAMPLE 6 
     Low-Calorie Carbonated Drink 
     The formula for the beverage was as below: 
     
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredients 
                 Quantity, % 
               
               
                   
                   
               
             
             
               
                   
                 Cola flavor 
                 0.340 
               
               
                   
                 Phosphoric acid (85%) 
                 0.100 
               
               
                   
                 Sodium citrate 
                 0.310 
               
               
                   
                 Sodium benzoate 
                 0.018 
               
               
                   
                 Citric acid 
                 0.018 
               
               
                   
                 Sweetener 
                 0.030 
               
               
                   
                 Carbonated water 
                 to 100 
               
               
                   
                   
               
             
          
         
       
     
     The beverages prepared with different sweeteners were given to 10 judges for comparison. 
     TABLE 3 shows the results. 
     
       
         
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE 3 
               
             
             
               
                   
                   
               
               
                   
                 Number of panelists 
               
             
          
           
               
                 Comparison 
                 Stevioside- 
                 Stevioside- 
                 Rebaudioside A 
                 Rebaudioside A 
               
               
                 Point 
                 90.2% 
                 99.3% 
                 90.0% 
                 98.9% 
               
               
                   
               
               
                 Bitter taste 
                 6 
                 2 
                 3 
                 0 
               
               
                 Astringent taste 
                 6 
                 2 
                 3 
                 0 
               
               
                 Aftertaste 
                 6 
                 2 
                 3 
                 0 
               
               
                 Quality of 
                 Sweet, 
                 Clean (7 of the 
                 Sweet, some 
                 Clean (10 of the 
               
               
                 sweet taste 
                 bitterness in 
                 10 judges) 
                 bitterness in 
                 10 judges) 
               
               
                   
                 aftertaste (6 of 
                   
                 aftertaste (5 of 
               
               
                   
                 the 10 judges) 
                   
                 the 10 judges) 
               
               
                 Overall 
                 Satisfactory (5 
                 Satisfactory (8 
                 Satisfactory (8 
                 Satisfactory (10 
               
               
                 evaluation 
                 of the 10 
                 of the 10 
                 of the 10 
                 of the 10 
               
               
                   
                 judges) 
                 judges) 
                 judges) 
                 judges) 
               
               
                   
               
             
          
         
       
     
     The above results show that the beverages prepared using highly purified Stevioside and Rebaudioside A possessing good organoleptic characteristics. 
     EXAMPLE 7 
     Chocolate 
     A composition containing 30 kg of cacao liquor, 11.5 kg of cacao butter, 14 kg of milk powder, 44 kg of sorbitol, 0.1 kg of salt, and 0.1 kg of sweetener prepared according to the EXAMPLES 2 or 3, was kneaded sufficiently, and the mixture was then placed in a refiner to reduce its particle size for 24 hours. Thereafter, the content was transferred into a conche, 300 grams of lecithin was added, and the composition was kneaded at 50° C. for 48 hours. Then, the content was placed in a shaping apparatus, and solidified. 
     The products are low-carcinogenic and low-calorie chocolate with excellent texture. Also, the organoleptic test carried out with 20 panelists revealed no lingering after-taste. The most desirable ones were the products with Rebaudioside-98.9% (19 members) and Stevioside 99.3% (16 members). 
     EXAMPLE 8 
     Ice-Cream 
     1.50 kg of whole milk were heated to 45° C., and 300 grams of milk cream, 100 grams of tagatose, 90 grains of sorbitol, 6 grams of carrageenan as a stabilizer, 3 grains of polysorbate-80 as an emulsifier, and 1.0 gram of sweetener prepared according to the EXAMPLES 2 or 3, were added into the milk and was stirred until the ingredients completely dissolved. The mixture then was pasteurized at a temperature of 80° C. for 25 seconds. The homogenization of the obtained mixture was carried out at a pressure of 800 bars and the samples were kept at a temperature of 4° C. for 24 hours to complete the aging process. Vanilla flavor (1.0% of the mixture weight) and coloring (0.025% of the mixture weight) are added into the mixture after aging. The mixture was then transferred to ice cream maker to produce ice cream automatically. Samples of ice creams produced were transferred to seal containers and were kept in the freezer at a temperature of −18° C. 
     The application of sweeteners does not affect the physicochemical properties of ice cream, as well as the overall attributes of color, smoothness, surface texture, air cell, vanilla aroma intensity, vanilla taste, chalkiness, iciness and melting rate. Organoleptic test carried out with 20 panelists. The most desirable ones were the products with 98.9% Rebaudioside A (18 members) and 99.3% Stevioside (14 members). 
     EXAMPLE 9 
     Yogurt 
     In 5 kg of defatted milk, 4.0 grams of sweetener, prepared according to EXAMPLES 2 and 3, were dissolved. After pasteurizing at 82° C. for 20 minutes, the milk was cooled to 40° C. A starter in amount of 150 grams was added and the mixture was incubated at 37° C. for 6 hours. Then, the fermented mass was maintained at 10-15° C. for 12 hours. 
     The product is a low-calorie and low-carcinogenic yoghurt without foreign taste and odor. 
     EXAMPLE 10 
     Table Top Tablet 
     A mixture, consisting of 58.5% lactose, 10% calcium silicate, 5% cross-carmellose, 5% L-leucine, 1% aerosol 200, 0.5% magnesium stearate, and 20% of a sweetener, obtained according to the EXAMPLE 2 or 3, was kneaded sufficiently. Then the mixture was shaped with the use of a tabletting machine, equipped with punchers of 6.2 mm diameter, into tablets of 70 mg each, 3.0 mm thick, and 10±1 kg hardness 
     The tablets can be easily administrated due to their appropriate sweetness. However, the formulations using low grade of Stevioside and Rebaudioside A were somewhat sticky with solubility about 3-4 minutes in water at 25° C. The tablets, prepared with highly purified Rebaudioside A show the best characteristics with the solubility around 20-30 seconds. 
     EXAMPLE 11 
     Tooth Paste 
     A tooth paste was prepared by kneading a composition comprising of calcium phosphate, 45.0%; carboxymethylcellulose, 1.5%; carrageenan, 0.5%; glycerol, 18.0%; polyoxyethylene sorbitan mono-ester, 2.0%; beta-cyclodextrin, 1.5%; sodium laurylsarcosinate, 0.2%; flavoring, 1.0%; preservative, 0.1%; Rebaudioside A or Stevioside, obtained according to the EXAMPLE 2 or 3, 0.2%; and water to 100%, by usual way. The product possesses good foaming and cleaning abilities with appropriate sweetness. 
     EXAMPLE 12 
     Soy Sauce 
     0.8 g of Rebaudioside A/Stevioside mixture (1:1, w/w) obtained according to the invention was added to 1000 mL of soy sauce and mixed homogenously. The products had an excellent taste and texture. 
     EXAMPLE 13 
     Bread 
     1 kg of wheat flour, 37.38 grams of fructooligosaccharide syrup, 80 grams of margarine, 20 grams of salt, 20 grams of yeasts, and 0.25 grams of high purity Rebaudioside A or Stevioside, obtained according to the EXAMPLE 2 or 3 were placed into the blender and mixed well. 600 ml of water was poured into the mixture and kneaded sufficiently. At the completion of the kneading process, the dough was shaped and raised for 30 to 45 minutes. The ready dough was placed in oven and baked for 45 minutes. Bread samples had creamy white color, and smooth texture. 
     EXAMPLE 14 
     Diet Cookies 
     Flour (50.0%), margarine (30.0%), fructose (10.0%), maltitol (8.0%), whole milk (1.0%), salt (0.2%), baking powder (0.15%), vanillin (0.1%), Rebaudioside A or Stevioside (0.55%), obtained according to this invention were kneaded well in dough-mixing machine. After molding of the dough the cookies were baked at 200° C. for 15 minutes. 
     The product is a low-calorie diet cookie with excellent taste and appropriate sweetness. 
     EXAMPLE 15 
     Cake 
     123 g of hen eggs, 45 g of sugar, 345 g of sorbitol liquid, 2.0 g of sucrose fatty acid ester, 0.35 g of Rebaudioside A or Stevioside was mixed with 100 g of wheat flour and 200 g of water in order to prepare a cake according to a conventional method. The product had an excellent taste with an optimal sweet flavor. 
     It is to be understood that the foregoing descriptions and specific embodiments shown herein are merely illustrative of the best mode of the invention and the principles thereof, and that modifications and additions may be easily made by those skilled in the art without departing for the spirit and scope of the invention, which is therefore understood to be limited only by the scope of the appended claims.