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Method for purifying concentrated stevioside by using nanofiltration

A stevioside and nanofiltration technology, which is applied in the field of purification and concentration of stevioside, can solve the problems of carbonization, atmospheric and environmental pollution, increase in product light transmittance and specific absorbance, etc., and achieves low operating pressure, energy saving, and improved The effect of purity

Inactive Publication Date: 2009-08-19
李善汪
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

If only the concentration of the sugar solution can be increased, the impurity content in the glycoside cannot be reduced and the purity of the glycoside cannot be improved.
In addition, the local overheating of the evaporator wall causes carbonization and coking of some low-boiling organic substances
There are also a small number of organic substances that are colorless at room temperature or in ethanol aqueous solution, but through long-term high temperature (more than 1 hour) and volatilization of ethanol, they are gradually converted into colored substances, resulting in the light transmittance and specific absorbance of the product. increased, the product purity decreased
Moreover, evaporation and concentration require a large amount of energy, and also cause air and environmental pollution.

Method used

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Examples

Experimental program
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Embodiment Construction

[0015] (a) Pretreatment: Stevia leaves are mixed with soft water at 50°C-55°C, and soaked to make stevioside extract, after two processes of flocculation sedimentation and plate and frame filter press, the filtrate after plate and frame filtration enters the next process ;

[0016] (b) Desalting: Desalting the above filtrate with ion exchange resin to obtain a desalted filtrate with a light transmittance ≥ 65% and an electrical conductivity ≤ 6700us / cm, and the desalted filtrate is sent to the next step;

[0017] (c) Adsorption: resin is used to adsorb the active ingredients of stevioside in the above-mentioned desalination filtrate, and the adsorption waste liquid is discharged or reused after being treated up to the standard;

[0018] (d) analysis: treat the resin with adsorbed stevioside active ingredients with sodium hydroxide and hydrochloric acid, and then use ethanol aqueous solution to analyze the stevioside active ingredients that have been adsorbed on the resin to ob...

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Abstract

The invention discloses a method for purifying concentrated stevioside by a nanofiltration technology. A stevioside product is obtained by the following procedures: stevia leaf pretreatment, desalinization, adsorption, dialysis, bleaching, ion exchange, vaporization for removing alcohol, nanofiltration, steam sterilization and filtration, spray drying and the like. The method can help eliminate organic substances and microbes with relative molecular weight lower than 600 during the nanofiltration process, and precipitate inorganic salt and combines concentration, dialysis and sterilization. The method can help greatly improve product purity and reach the stevioside content up to 90% and the specific absorbance not greater than 0.015, and has the advantages of convenient operation, low operating pressure, energy saving, no pollution and the like.

Description

Technical field [0001] The invention relates to a method for purifying and concentrating stevioside, in particular to a method for purifying and concentrating stevioside by using nanofiltration technology. Background technique [0002] At present, there are mainly two concentration processes for the production of stevioside: one is concentration under reduced pressure or atmospheric pressure, and the other is concentration by evaporation. Because stevioside molecules have better heat resistance and stability, for example, stevioside is heated to 50-100°C in a solution with a pH of 4-10, and the heating time does not change from 0.5-24h. Many manufacturers generally use atmospheric pressure concentration or reduced pressure concentration when choosing a concentration process. As a result, due to the high concentration multiple, the specific absorbance of the product exceeds the standard and the purity is too low. Evaporation and concentration is to heat the dilute solution t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07H15/24C07H1/08B01D61/00
CPCY02P20/10
Inventor 李善汪
Owner 李善汪
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