Method for removing pigment and ichangin of inulin produced through full-film technology

Abstract

The invention discloses a method for removing pigment and ichangin of inulin produced through a full-film technology. The method includes the following steps that first, a cichorium intybus water extracting solution is intercepted by an ultrafiltration membrane, macromolecules of non-inulin components are removed, and accordingly a clear solution is obtained; second, the ultrafiltration membrane clear solution is pretreated by a nanofiltration membrane, the content of salt in the solution is lowered, and the strong solution is qualified under the conditions that the electric conductivity is lower than 1000 S and the acidity PH value is 6.5-7; third, the feed solution pretreated by the nanofiltration membrane is subjected to decoloration and debitterizing treatment through macroporous resin, and the purposes that the solution is colorless and free of bitterness and the electric conductivity is lower than 200 S are achieved; fourth, the feed solution subjected to decoloration and debitterizing treatment through the macroporous resin is dehydrated and desalted through the nanofiltration membrane. According to the method, membrane method separation and macroporous resin absorption are reasonably combined, and the optimum decoloration and debitterizing effects are achieved on the inulin produced by cichorium intybus; compared with products in the same industry, the bitterness is the same, the color scale is lowest, pollution is minimum, and the solid inulin yield is highest and reaches 10%.

Description

Technical field [0001] The invention relates to a method for extracting natural plants to remove natural pigments and picrines possessed by plants. Background technique [0002] In the process of producing inulin by using chicory as raw material, the pigment and bitterin in the plant should be removed. The original production method is: the extraction liquid is subjected to a flocculation process to precipitate macromolecules and part of the pigment; the material liquid is then subjected to electrodialysis Most of the salt is removed, and then desalted by desalting resin; afterwards, the material liquid obtained by decolorizing by activated carbon and adsorbing picrine by the debittering resin is concentrated to remove most of the water and then goes to the next process for concentration and spray drying to obtain inulin. The disadvantage of this method is that calcium hydroxide and ferrous sulfate need to be added for flocculation and precipitation, and external salt is added to...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that calcium hydroxide and ferrous sulfate need to be added for flocculation and precipitation, and external salt is added to the feed solution to increase the burden of desalination; decolorization uses activated carbon adsorption, activated carbon can not be recycled for one-time use, and has adsorption to materials ( 7.8% loss was reported)