Method for extracting refined yellow pigment from red flowers

Abstract

The invention provides a preferable method for extracting refined yellow pigment from red flowers, which adopts the technology integration of extracting and refining, resin adsorption, nano filtration separation, outer circulating vacuum reduced pressure concentration and spray drying. The method is as follows: performing particles removing, ashing and sterilization on primary filtrate by a filter; adsorbing resin with large aperture by alcohol, wherein the upper prop adsorbing flow is 1-4BV / h, the adsorbing time is 1.5-2.0 hours, the eluting flow is 2-6BV / h, and the eluting time is 2.5-3.0 hours; collecting eluent, wherein the PH values of upper prop liquid medicine and cleanout fluid are 2-5; depredating macromolecules by a microfiltration membrane, wherein the control pressure is 0.1-0.2MPa, the temperature is 5DEG C higher than the room temperature or 5 DEG C lower than the room temperature; thickening and dewatering by a nanofiltration membrane, wherein the control pressure is 1-4MPa, the temperature is 20-50 DEG C, and the concentration multiplying power is 5-10 times; recycling the alcohol; and drying a material the solid content of which is 40%-60% to obtain the product, wherein the feed temperature is 60-80 DEG C, the entering air temperature is 160-190 DEG C. By implementing the preferable method, the extraction ratio of the yellow pigment reaches more than 80%, and the color value also reaches more than 150.

Description

technical field [0001] The invention relates to the extraction of natural plant pigments, especially the extraction of pigments in safflower, and is particularly suitable for a preferred method for extracting and refining yellow pigments from safflower. Background technique [0002] In recent years, the production of natural pigments in my country has developed rapidly. In 2002, the government made a regulation prohibiting the use of various chemically synthesized pigments in "A-level" green food, thus greatly promoting the development of my country's natural pigment market. According to statistics, in 2005, the area of ​​pigmented peppers, safflower and marigold planted in Northeast, Shandong, Shanxi and Xinjiang alone reached more than 800,000 mu, and the annual output of natural pigments was close to 4,000 tons, second only to India. However, due to the factor of consumption cost, the deep processing and finishing of natural pigments are still lacking in China, and this f...