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Method for extracting stevioside by adopting recrystallization

A steviol glycoside and recrystallization technology, applied in chemical instruments and methods, sugar derivatives, sugar derivatives, etc., can solve the problems of low refining efficiency, poor taste, and low added value, shorten the production cycle, and improve the flocculation effect , the effect of increasing the sedimentation velocity

Inactive Publication Date: 2020-05-15
内蒙古昶辉生物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The research of the stevia sugar project mainly focuses on the breeding of stevia leaves, the decolorization and impurity removal of glycosides, and the recrystallization. At present, the highest glucoside content in the national industrialized production can reach 85-90%, but the overall level cannot be tolerated. Optimistic, glucoside content below 80% still occupies a certain proportion than those with too high absorbance. Stevioside processing enterprises generally have insufficient automation, low refining efficiency, and some glycosides with very low content cannot be separated, resulting in poor taste and The phenomenon of yellowish color and low added value hinders the further development of my country's stevioside industry. In order to solve the above problems, a new technical solution is provided.

Method used

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Examples

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Effect test

Embodiment 1

[0030] A method for extracting steviol glycosides by recrystallization, comprising the following steps:

[0031] (1) Extraction of raw materials: Select high-quality dry leaves of Stevia rebaudiana through screening and carry out two-stage countercurrent extraction at a water temperature of 80°C, and the extract enters the next process;

[0032] (2) Flocculation process: place the extract in a water bath at 42°C and stir at a constant temperature for 16 minutes at a stirring speed of 35 rpm, then add a flocculant, adjust the pH to 9, let stand for 35 minutes, and filter to obtain a clarified water extract of Stevia rebaudiana;

[0033] The flocculant, its raw materials include by weight: 6.6 parts of chitosan, 18.5 parts of lignin, 15.8 parts of ammonium persulfate, 23 parts of polyaluminum ferric sulfate, 23.5 parts of aluminum citrate, 4.2 parts of magnesium sulfate, calcium chloride 3.3 parts, 18.2 parts of iron polysilicate, 3.6 parts of sodium carboxymethyl cellulose, 5.5...

Embodiment 2

[0042] A method for extracting steviol glycosides by recrystallization, comprising the following steps:

[0043] (1) Raw material extraction: select high-quality dry leaves of Stevia rebaudiana through screening and carry out two-stage countercurrent extraction at a water temperature of 75°C, and the extract enters the next process;

[0044] (2) Flocculation process: place the extract in a water bath at 46°C and stir at a constant temperature for 16 minutes at a stirring speed of 55 rpm, then add a flocculant, adjust the pH to 9, let it stand for 35 minutes, and filter to obtain a clarified water extract of Stevia rebaudiana;

[0045] The flocculant, its raw materials include by weight: 7.3 parts of chitosan, 18.4 parts of lignin, 16.6 parts of ammonium persulfate, 23.5 parts of polyaluminum ferric sulfate, 23 parts of aluminum citrate, 3.5 parts of magnesium sulfate, calcium chloride 2.6 parts, 19.6 parts of iron polysilicate, 3.9 parts of sodium carboxymethyl cellulose, 6.6 ...

Embodiment 3

[0055] A method for extracting steviol glycosides by recrystallization, is characterized in that, comprises the following steps:

[0056] (1) Raw material extraction: select high-quality dry leaves of Stevia rebaudiana through screening and carry out two-stage countercurrent extraction at a water temperature of 85°C, and the extract enters the next process;

[0057] (2) Flocculation process: place the extract in a water bath at 41° C. and stir for 15 minutes at a constant temperature at a stirring speed of 40 rpm, then add a flocculant, adjust the pH to 8.5, let stand for 35 minutes, and filter to obtain a clarified water extract of Stevia rebaudiana;

[0058] The raw materials of the flocculant include by weight: 6.5 parts of chitosan, 17 parts of lignin, 14.2 parts of ammonium persulfate, 23 parts of polyaluminum ferric sulfate, 21.3 parts of aluminum citrate, 3.6 parts of magnesium sulfate, 2.4 parts of calcium chloride 18.1 parts of iron polysilicate, 4.3 parts of sodium c...

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PUM

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Abstract

The invention discloses a method for extracting stevioside by adopting recrystallization. The method for extracting the stevioside by adopting the recrystallization comprises the following steps: extracting raw materials; carrying out flocculation; carrying out adsorption and separation; carrying out concentration; carrying out crystallization; carrying out centrifugal separation; carrying out reverse osmosis and concentration; carrying out recrystallization; and carrying out post-treatment. According to the method for extracting the stevioside by adopting the recrystallization, the steviosideis separated and purified by adopting the recrystallization; and then, other impurities are removed by performing process optimization. A stevioside product obtained by the method is pure, high in stevioside content, and safe; and the stevioside product has a total glycoside content higher than 99%, as well as a stevioside A content higher than 98%.

Description

technical field [0001] The invention relates to the technical field of food additive preparation, in particular to a method for extracting steviol glycosides by recrystallization. Background technique [0002] Stevia rebaudiana (stevia rebaudiana), also known as stevia ﹑ sugar grass, belongs to Compositae (Comppositae), Stevia genus, and its origin is in subtropical South America. Since 1976, scientific research units such as Nanjing Zhongshan Botanical Garden and Chinese Academy of Agricultural Sciences have successively introduced stevia from Japan for trial planting. Stevia contains 14 kinds of trace elements and 32 kinds of nutrients. It is not metabolized, not accumulated, not carcinogenic, and non-toxic in the body. Its safety has been recognized by the international FAO and WHO and the US FAD. Sugar source, but also a good source of nutrition. [0003] Steviol glycosides, referred to as steviosides, are a class of sweet terpene glycosides extracted from dried stevia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H1/08C07H15/256C08B37/08C01G49/14
CPCC07H1/08C07H15/256C08B37/003C01G49/14
Inventor 张成亮廖小雪王岩赵永强马亚琼张树元
Owner 内蒙古昶辉生物科技股份有限公司
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