Extraction method of roselle red color

Abstract

The invention discloses an extraction method of roselle red color. The method comprises the steps of selecting materials, drying, smashing, digesting, enzyme treatment, clarifying, concentrating, blending, sterilizing and drying. Compared with the prior art, the method has the advantages that low pigment loss rate is ensured in a raw material drying process, the unit raw material utilization efficiency and pigment extraction rate are increased, the problem of thickness of an extracting solution is solved in a mild way, the stability of pigments in a processing process is ensured, the processing cost is reduced remarkably, and the product quality is enhanced. The method contributes to saving energy and protecting the environment, is friendly to the ecological environment, does not cause any adverse effect, and is a novel processing process which is worthy of popularization for natural plant pigments.

Description

[0001] technical field [0002] The invention relates to a process for extracting natural pigments, in particular to a method for extracting roselle red pigments. [0003] Background technique [0004] Roselle, also known as roselle, mountain eggplant, etc., is an annual shrub of the Malvaceae Hibiscus genus. It was first produced in Africa and is a plant in tropical and subtropical arid areas. It is planted in Fujian, Guangxi, Guangdong, Yunnan and other places in my country. Roselle has a plump appearance, thick petals, purple-red and black calyx, bright and fresh melted water, slightly fragrant air, and sour taste, which contains a large amount of organic acids, vitamin C, protein, various amino acids, natural vitamins, and iron, which are needed by the human body. Minerals such as calcium and phosphorus. [0005] As people's awareness of health care gradually increases, consumers are more and more concerned and worried about the food safety of synthetic food coloring, ...

AI Technical Summary

Problems solved by technology

[0007] The problems in the above method are: due to the use of organic solvents to extract roselle red pigment, there will inevitably be problems such as environmental pollution, organic solvent residues, high cost, and high energy consumption.

In other extraction methods of roselle red pigment, a large amount of pectin substances are inevitably extracted, which makes the viscosity of the extract solution at a relatively high level and affects subsequent production. Chitosan is used to absorb and centrifuge before processing through plate and frame microfiltration. The process is too long, and the loss of the pigment process is large; the direct filtration of pectin by ultrafiltration is very easy to cause blockage of ultrafiltration membrane pores, the cleaning frequency of membrane elements will increase, and the cleaning agent may remain in the filtrate, cleaning agent and eluate It will also increase the cost of sewage treatment

During the concentration process, the high temperature of vacuum concentration will lead to the instability of roselle red pigment; the resin adsorption requires the use of organic solvents during elution, which is costly and also has the problem of organic solvent residues; single-stage reverse osmosis membrane concentration, when mass production The medium concentration time will be prolonged, and its optimal dehydration temperature will cause rapid growth of microorganisms, especially in a long period of time, microbial factors will lead to a reduction in pigment content