Method for extracting brown pigment from plant

Abstract

The invention relates to the field of edible pigment and discloses a method for extracting brown pigment from a plant. The method comprises the following steps: pulverizing the plant containing the brown pigment and extracting brown pigment extracting liquid by using deep-eutectic solvent extracting liquid; adding mixed liquid of petroleum ether and ethyl acetate into the extracting liquid to remove fat, and adding an attapulgite loaded chitosan crosslinked cyclodextrin compound into the defatted extracting liquid to obtain a brown pigment compound precipitate adsorbed on the attapulgite loaded chitosan crosslinked cyclodextrin compound; dissolving the precipitate in an organic solvent to perform desorption and centrifugation to obtain brown pigment supernatant containing the organic solvent; enabling the supernatant to pass through a microporous filtration membrane to obtain a purified brown pigment solution containing the organic solvent; and removing the organic solvent from the brown pigment solution to obtain a target product brown pigment. The deep-eutectic solvent serves as an extracting solvent, so the method is green and environment-friendly, and the extraction rate is high; and the brown pigment is purified and separated by the attapulgite loaded chitosan crosslinked cyclodextrin compound, so 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.

Images