Microwave extraction method for purple cabbage haematochrome

Abstract

The invention discloses a microwave method for extracting red cabbage pigment, comprising the following steps that: purple cabbage is dried and crushed into 40 to 100 meshes, hydrochloric acid with a concentration between 0.20 and 0.50mol / L is added into the purple cabbage powder according to the solid-to-liquid ratio of between 1 to 8 and 1 to 20, the purple cabbage powder is immersed in the hydrochloric acid for 30 to 60 minutes, the microwave power is controlled to between 600 and 900W, the mixture is heated for 80 to 150 seconds, the product is taken out, cooled and filtered, the process is repeated for twice; the extracting solution is decompressed and condensed as well as is purified by a macroporous resin, is washed by water and is eluted by 30 to 70 percent ethanol; and the eluting solution is decompressed, condensed and dried so that the purple cabbage pigment product is prepared. The method has simple steps, and convenient and simple operation, accelerates the dissolution of the effective components by using microwave to heat, combines the macroporous resin to separate and purify, is not time-consuming and has high extracting efficiency. The obtained pigment product has high content of anthocyanin and good stability.

Description

Technical field [0001] The invention relates to a method for extracting natural pigments, in particular to a method for extracting purple cabbage red pigment by microwave. Background technique [0002] As an important food additive, natural pigments are not only widely used in recreational foods such as beverages, candies, cakes, wines, etc., but also have the characteristics of high safety and natural and bright colors. Some natural pigments can also prevent various diseases of the human body. Treatment and other pharmacological effects and health care functions. At present, the production of natural pigments is still based on traditional direct extraction. The traditional extraction methods mainly include: solvent extraction, squeezing, filtration, etc. The pigment products produced generally have low yields, weak coloring power, and product stability. Poor, high production cost and other defects. Microwave extraction technology is to use microwave energy to raise the temperatu...

AI Technical Summary

Problems solved by technology

The use of microwave technology to extract natural pigments has made some research progress in the aspects of orange yellow pigment, roselle red pigment, persimmon red pigment, etc., but so far, there has been no report on the microwave extraction method of purple cabbage pigment