Deep bleaching method of stevioside

Abstract

The invention discloses a deep bleaching method of stevioside. The method comprises the following technological steps: (1) bleaching a stevioside extracting solution or a solution by using resin, so as to obtain a destaining solution; (2) adding an oxidant to the destaining solution, stirring and oxidizing a pigment, so as to obtain oxidized solution; (3) decomposing the pigment from the oxidized pigment in an illumination manner, so as to deeply remove the pigment in the extracting solution or the solution. By adopting the method, the oxidant pigment is added to the yellowish stevioside solution which is bleached by the resin to oxidize, and then the pigment is decomposed in the illumination manner, so that use of activated carbon is avoided, and consumption of the stevioside is reduced. Thus, the cost is saved, and the yield and the product quality are improved. A trace of pigment can be quickly removed by selecting the oxidant and the lighting condition of not generating impurities, so that the color of the product is pure white. Therefore, the deep bleaching method has the characteristics of being simple in technology, significant in effect, high in yield, low in cost, and good in economic benefits, the obtained product is pure white in color, and other impurities are not added.

Description

technical field [0001] The invention relates to a deep processing method of stevioside, in particular to a deep decolorization method of stevioside. Background technique [0002] Stevioside (glycoside) is a new type of natural sweetener extracted from stevia leaves of Compositae herb. It has the characteristics of high sweetness and low calorie. Flavoring agent, known internationally as "the third source of sugar in the world". Widely used in food, beverage and other industries. [0003] During the production process of stevia, the pigment components are removed step by step through flocculation, resin decolorization, activated carbon decolorization and other methods. Since the concentration of stevioside is far greater than that of the pigment, if activated carbon is used for adsorption and decolorization, a large amount of stevioside will be adsorbed at the same time; the concentration of 1% stevioside in the solution after decolorization by activated carbon can reach 0....

AI Technical Summary

Problems solved by technology

Since the concentration of stevioside is far greater than that of the pigment, if activated carbon is used for adsorption and decolorization, a large amount of stevioside will be adsorbed at the same time; the concentration of 1% stevioside in the solution after decolorization by activated carbon can reach 0.03-0.04 at 370nm; It also took away part of the stevioside ingredients, resulting in a decrease in yield and an increase in cost; moreover, the product is still slightly yellowish and difficult to completely remove, and small activated carbon particles are easily brought into the product and affect the appearance quality of the product

The use of resin decolorization requires a large amount of resin, high investment, and as the use time increases, the decolorization effect will gradually decrease, and the final product is difficult to reach pure white; Basic anion resin and weakly basic anion resin are decolorized twice, but there are still trace pigment residues

[0004] In summary, it is difficult to remove the pigment in stevioside in the existing methods and the effect is not ideal, which seriously affects the quality and quality of stevioside