Process for extracting litchi polyphenol from litchi rind

Abstract

The invention discloses a process for extracting litchi polyphenol from litchi rind. The process comprises the following steps: regulating the pH of an extracting solvent to be less than or equal to 6.0 with acid; extracting and degrading the litchi rind with the pH value-regulated extracting solvent; allowing the extract to pass through a macroporous adsorption resin column; washing the column with water, and then with low-carbon alcohol; tracing and checking with thin layer chromatography, and collecting alcohol eluent containing a target component; and concentrating and drying the alcohol eluent. According to the preparation method, the litchi rind is extracted by adopting the acidity-regulated extracting solvent, on the one hand, the litchi polyphenol is effectively protected, the oxidation degree of polyphenol substances in the extracting process can be furthest avoided, and on the other hand, the whole system is in an acidic condition, so that the polymer in the polyphenol substances can be degraded into small-molecular substances with good water solubility, and the water solubility and bioavailability of the obtained product can be effectively improved. Furthermore, the process is simple and easy to operate, and the product is high in polyphenol content and high in yield.

Description

technical field [0001] The invention relates to a method for extracting active components in plants, in particular to a process for extracting litchi polyphenols from litchi skin. Background technique [0002] Litchi (Litchi chinensis) is a Sapindaceae (Sapindaceae) plant, and its main production areas are the southwest and south of my country, and it is a famous fruit. Due to the concentrated production period of lychee, strong seasonality, and difficulty in keeping fresh, the deep processing of the product presents the characteristics of short time and heavy tasks. A large number of by-products of lychee peel produced during the processing are usually treated as waste, which has not been well treated. Make full use of it as the lengthening of the litchi industry chain and the improvement of the industry level. Litchi skin is rich in polyphenols, mainly epicatechin, rutin, ferulic acid, etc. Litchi polyphenols have biological activities such as anti-oxidation, anti-inflamm...

AI Technical Summary

Problems solved by technology

Another example is the invention patent with the publication number CN102895388A, which discloses a kind of lychee peel is extracted with lye as a solvent, and then the extract is acidified, and the substance formed by the reaction of polyphenol and alkali is reduced to polyphenol, which overcomes the prior art. The use of organic solvents as solvents has the disadvantages of high production costs and low polyphenol content in the extract, but the solvent used in this method is relatively alkaline, which requires certain requirements for extraction equipment. At the same time, the yield of litchi polyphenols in this method Low, about 0.7-0.8% (fresh lychee skin)

The above-mentioned inventions all failed to take overall consideration and realization of the protection of polyphenols, the degradation of polymers (improve bioavailability), and the high yield of litchi polyphenol products.