Method for extracting plant brown pigment

Abstract

The invention relates to the field of edible pigments, and discloses a method for extracting brown pigment from plants. After the plant containing brown pigment is crushed, a deep eutectic solvent extract is used to extract the brown pigment extract; petroleum ether and ethyl acetate are added to the extract The mixed solution is degreased, and the attapulgite-loaded chitosan cross-linked cyclodextrin complex is added to the degreased extract to obtain the brown pigment complex adsorbed on the attapulgite-loaded chitosan cross-linked cyclodextrin complex Precipitate; dissolve and desorb the precipitate in an organic solvent, and centrifuge to obtain a brown pigment supernatant containing an organic solvent; pass the supernatant through a microporous membrane to obtain a brown pigment solution containing an organic solvent; remove the organic solvent in the brown pigment solution Solvent to obtain the target product brown pigment. The invention uses a deep eutectic solvent as an extraction solvent, which is green, environmentally friendly, and has a high extraction rate; the attapulgite-loaded chitosan cross-linked cyclodextrin complex is used to purify and separate the brown pigment, and the process is simple and the purification and separation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of edible brown pigment extraction, in particular to a method for extracting plant brown pigment. Background technique [0002] Natural pigments are pigments that people obtain from natural animals, plants or microbial cell tissues through certain technical means. Compared with synthetic pigments, they are non-toxic and natural in color, and have gradually become a new trend in the development of the world today. Their development and application It has also become a major research hotspot. [0003] Plant husks and seed husks are the by-products left after plants are eaten or processed. The husks or seed husks that account for a certain proportion of the whole fruit are often used as waste, fertilizer or fuel, and have not been effectively developed and utilized, resulting in a waste of resources. waste. A large number of studies have shown that the shells of plant fruits are rich in natural pigments, whic...

AI Technical Summary

Problems solved by technology

Due to the complex preparation steps, low extraction efficiency, large differences in the organic solvents used for pigment components of different polarities, and the existence of solvent toxicity, volatility, and corrosiveness, it is easy to cause environmental pollution and solvent residues in the extract.

[0005] The emergence of ionic liquids was once considered to be a good substitute for traditional organic solvents, but with the deepening of research, people gradually found that these solvents were in some irreconcilable contradictions in the process of use.

For example, ionic liquids generally have high viscosity, recovery and separation and purification of products are difficult; and the preparation process of most ionic liquids is not green, and their own separation and purification are difficult, water absorption is serious, and the preparation cost is high; traditional imidazole and pyridine ions The liquid is non-renewable, difficult to degrade, and has obvious toxicity, etc., which directly leads to difficulties in the industrial application of ionic liquids.

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