Method for purifying stevioside by secondary ion exchange

A secondary ion exchange and stevioside technology, which is applied in the field of stevioside purification, can solve the problems that the product is difficult to meet the international high-grade product standard, and the ability of ion exchange resin to remove impurities is reduced.

Active Publication Date: 2009-08-12
李善汪
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, due to the organic solvent contained in the raw material of stevioside, the organic solvent can reduce the exchange and removal ability of the ion exchange resin, making it difficult for the product to meet the international high-grade product standard

Method used

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Comparison scheme
Effect test

Embodiment Construction

[0015] Ion exchange resin is composed of a high polymer backbone, functional groups connected to the backbone and exchangeable ions in the functional groups. The impurity removal principle is: charged functional groups combine with oppositely charged ions, and this ion becomes a counter ion, which can be exchanged with external ions of the same charge; uncharged only has the function of free electron pairs Radicals bind polar molecules, ions, and ionic compounds through free electron pairs. Thus, impurities with polar molecules, ions and ionic compounds are adsorbed on the ion exchange resin to achieve the effect of removing impurities. However, when removing impurities from the stevioside extract, since the stevioside extract contains an organic solvent, the organic solvent will wrap some polar molecules and ions, and affect the connection between the counterion and the functional group, and The structure and polarity of some impurities will change in specific organic solven...

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Abstract

The invention provides a method for purifying stevioside by using secondary ion exchange. Working procedures such as pretreatment, desalination, absorption, analyzing, decolorization, ion treatment, evaporation concentration, secondary ion exchange, steam aseptic filtration, spray drying and the like are carried out on stevia leaves so as to obtain stevioside products. Before spray drying, the ion exchange deep removal of impurity is carried out on the concentrated solution treated by the evaporation concentration, thus avoiding the possibility of the exchange removal of purity capability reduction of the ion exchange resin caused by the interference of organic solvent, causing the ion exchange resin to give full play to the function and advantage of the removal of impurity thereof, ensuring indicators of the product to reach the standard of the international top-grade products and the content of the product containing glucoside to reach more than 90% and the absorbance being less or equal to 0.04.

Description

Technical field [0001] The invention relates to a method for purifying stevioside, in particular to a method for purifying stevioside by secondary ion exchange. Background technique [0002] As a new type of natural sweetener with high sweetness, low calorie, good taste, safety and non-toxicity, stevioside can be widely used in food, beverage, medicine, daily chemical industry and other industries. At present, stevioside products are mostly produced by resin adsorption method, which has the advantages of high yield, low energy consumption, small glucoside loss, good quality, simple operation and low production cost. However, since the stevioside raw materials contain organic solvents, the organic solvents can reduce the ability of the ion exchange resin to remove impurities, making it difficult for the product to meet the international high-grade product standard. Contents of the invention [0003] In order to overcome the above disadvantages, the present invention provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/24C07H1/08B01D15/04
Inventor 李善汪
Owner 李善汪
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