Preparation technique of natural pigment from red jujube peel

Abstract

The invention relates to a preparation technique of natural pigment from red jujube peel. Firstly, viscous pectin in a jujube peel is removed to ensure the powder state of a finished pigment product; extraction is carried out at room temperature to ensure the chemical stability and the natural state of the pigment product; and alkali dissolution and acid deposition are carried out with simple process and low cost. The preparation technique is characterized by comprising the following steps of: firstly, extracting and removing the pectin in the jujube peel by using an acid extraction method; then, extracting the jujube peel pigment with a water solution of sodium hydroxide at room temperature, and carrying out fine filtration to remove tiny peel dregs and other impurities from the pigment extracting solution; and finally, adding concentrated acid to deposit the pigment, centrifuging, cleaning the deposits with acidulous water to remove salts in the pigment, centrifuging and drying to obtain a pigment product.

Description

technical field [0001] The invention relates to a production method for separating and extracting natural jujube skin pigment from jujube skin, belonging to the technical field of biochemical industry. Background technique [0002] Jujube, also known as Chinese jujube, jujube, and Chinese jujube, is the fruit of the jujube tree of the genus Jujube in the family Rhamnaceae. There are more than 700 varieties of jujube trees in my country, the most famous of which are Jinsixiaozao, Dongzao, Beshanbanzao, Binxian Jinzao, Xinzheng Huizao, Lingbaozao, Zanhuangzao, Yunchengxiangzao, Jiaocheng Junzao, Taigu Huping Jujube, etc. Jujube is mainly produced in my country. At present, my country has more than 95% of jujube resources and jujube products in the world. Jujube is a food with the same origin as medicine and food, and its unique nutritional and medicinal value is attracting more and more people's attention, and the processed products of jujube are also becoming more and more a...

AI Technical Summary

Problems solved by technology

[0004] (1) During the process of extracting jujube skin pigment by alkaline method, the pectin in the jujube skin is dissolved simultaneously, and the content of pectin impurities in the product is high, resulting in high viscosity of the pigment product, which is in a colloidal state, and is difficult to be made into a powder state;

[0005] (2) The temperature of the pigment extraction process is too high, which affects the stability of the pigment, and the color of the pigment product is dark, making it difficult to guarantee the quality of the pigment;

[0006] (3) After the pigment is extracted by the alkaline method, the pigment extract is concentrated to dryness by vacuum distillation (the application number is CN200710061652.6). The distillation process consumes a lot of energy, and the pigment exists at high temperature under alkaline conditions for a long time, and the pigment is stable. Sexuality is affected, resulting in further darkening of product color

[0007] (4) The method (application number is 200910143496.7) of pigment extraction by alkaline method and adsorption resin purification is complex in operation and takes a long time, ethanol solution is used for eluting, and ethanol needs to be consumed, and the recovery of ethanol increases the energy consumption of the process, resulting in Further increase in production costs

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