Method for producing gellan gum finished product from gellan gum fermentation liquor

Abstract

The invention relates to a method for obtaining transparent hydration inclined gellan gum products from gellan gum fermentation broth, comprising techniques of dehydration and condensation of the fermentation broth, repeated dissolution, clarification, and repeated dehydration and condensation and so on. After the great mass of pigments, residual sugar and metal ions in the fermentation broth areremoved by utilizing techniques of condensation and repeated dissolution of the invention, color and transparency of the gellan gum products are improved. The invention can use basically same technological line and production facilities to conveniently and alternately produce low acyl or high acyl gellan gum products according to market demand.

Description

technical field [0001] The invention relates to a method for producing gellan gum products from gellan gum fermentation liquid. Background technique [0002] According to the different gel characteristics of gellan gum caused by the acetyl group content in gellan gum polysaccharide molecules, gellan gum products are usually divided into two types: one is high acyl gellan gum products, which are easy to form viscoelasticity after hydration Gel, the base contained in normal gellan gum fermentation broth is high acyl gellan gum, the C of D-glucose residue in the repeating unit of its polysaccharide molecule 6 About 50% are substituted by acetyl groups; the other is a low-acyl gellan gum product, which is obtained by deacylation or partial deacylation of high-acyl gellan gum. After hydration, it is easy to form a brittle gel under the action of cations. According to the transparency of the gellan gum after hydration, it can be divided into transparent gellan gum and non-transpa...

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Problems solved by technology

Although the gellan gum content is very low, the fermentation broth has a high viscosity and cannot be filtered and clarified at room temperature. If it is filtered at high temperature, the impurities in the fermentation broth will turn against each other and make the color darker, so it is difficult to obtain transparent and colorless gellan gum after dissolution. Glue products

[0004] CN1351172A discloses a kind of technique from the transparent gellan gum of low acyl group in fermented liquid, the weak point of this process is: directly do deacyl treatment to fermented liquid, some organic matter (as amino acid, Sugar, pigment) react with each other to produce browning, the color of the reaction solution is very dark, even if the subsequent process uses activated carbon decolorization and microfiltration membrane filtration, it is difficult to remove, not to mention the high cost of high-temperature membrane filtration, and the microfiltration membrane is easily damaged at high temperature

[0006] CN1687437A discloses a method for extracting high acyl gellan gum. The method does not have a deacyl step, but the fermented liquid still needs to be subjected to high-temperature treatment in order to sterilize, and the purity of the product is very low due to the inability to remove the thallus fragments in the fermented liquid. It is cloudy after dissolving and can only be used as a low-end product

[0007] There is no report on the production technology of transparent high acyl gellan gum so far

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