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Method for extracting roselle calyx red pigment

An extraction method, the technology of roselle red, is applied in the field of extraction of natural plant pigments, which can solve the problems of reduced utilization rate of raw materials, mildew, fading, and damage of raw materials, and achieve the effects of low cost, obvious energy saving effect, and improved utilization rate

Active Publication Date: 2012-11-21
漳州金三角生物科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] Drying and dehydration can easily cause mildew and discoloration of raw materials, and the high temperature in drying and dehydration can also damage temperature-sensitive pigments. These two traditional dehydration methods make the retention rate of raw material pigments low, resulting in reduced utilization of raw materials; traditional extraction The process needs to add ethanol and hydrochloric acid, which is likely to cause environmental pollution; traditional purification uses plate and frame filtration, etc., and vacuum or evaporation concentration is used for concentration, which cannot completely remove impurities such as macromolecular pectin and small molecular organic acids and inorganic ions.
Although the quality of products obtained by resin adsorption technology is high, the price of resin materials is expensive, making the production cost high

Method used

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  • Method for extracting roselle calyx red pigment

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Effect test

Embodiment 1

[0020] Take 100kg fresh roselle calyx as material, dehydrate 5 hours at 45-50°C by heat pump to obtain 36kg dried roselle calyx (water content is 16%-18%); heat 720kg of water to 50-60°C, and then dry The calyx is completely soaked in it, and the temperature is maintained for 1 hour, and the extraction is performed twice. The water used for the second extraction includes the water obtained by the subsequent nanofiltration; 0.1-0.2Mpa polyamide roll-type microfiltration membrane is refined to remove pectin and other macromolecular soluble impurities, and the TFM nanofiltration membrane with a molecular weight cut-off of 600-800 and a working pressure of 0.7-0.8Mpa is concentrated to further remove small molecules of organic acids, Sugar, inorganic ions, and other residual impurities were obtained to obtain 68 kg of roselle red pigment concentrate, which was then spray-dried. The air inlet temperature was 180° C., and the air outlet temperature was 85-95° C. After drying, 6.8 kg ...

Embodiment 2

[0022] 200 kg of fresh roselle calyxes were used as materials, and dehydrated by a heat pump at 45-50° C. for 6 hours to obtain 72 kg of roselle dried calyxes (with a water content of 16%-18%). Heat 1440kg of water to 50-60°C, then soak all the dried calyx in it, maintain the temperature for 1 hour, and extract twice, and the water used for the second extraction includes the water obtained by nanofiltration; it is removed by bag filtration Foreign matter, the polyamide roll-type microfiltration membrane with a molecular weight cut-off of 80,000-100,000 and a working pressure of 0.1-0.2Mpa is refined to remove macromolecular soluble impurities such as pectin. TFM nanofiltration membrane concentration further removes residual impurities such as small molecule organic acids, sugars, inorganic ions, etc. to obtain 140kg of roselle red pigment concentrate, which is then spray-dried. The temperature of the air inlet is 180°C, and the temperature of the air outlet is 85-95°C After dr...

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Abstract

The invention relates to a method for extracting a roselle calyx red pigment, which relates to a method for extracting a roselle calyx red pigment, the method comprises the following steps: 1) dehydrating and preserving a fresh roselle calyx raw material through a heat pump; 2) extracting the dehydrated raw material through water; 3) extracting the pigment, through rough filtering and filter membrane fine filtering, separating and purifying a pigment extract,4) concentrating the pigment extract through a nanofiltration membrane, circularly using the nanofiltrated water for extracting the raw material; and 5) spraying and drying a pigment concentrated solution to obtain the products. Compared with the prior art, the method for extracting the roselle calyx red pigment has the advantages of energy conservation and environmental protection, and the obtained product has high quality and reasonable price.

Description

technical field [0001] The invention relates to a method for extracting natural plant pigments, in particular to a method for extracting roselle red pigment. Background technique [0002] Natural food coloring is a kind of food additive that has received widespread attention in the past 20 years. Roselle red pigment is an anthocyanin pigment extracted from roselle calyx. The main components are cyanidin-3-elderbioside and delphinium Elderberry-3-glucoside, as well as a small amount of cyanidin-3-glucoside and delphinidin-3-glucoside, is a safe, non-toxic natural food coloring with anti-oxidation, liver protection, Blood lipids, blood pressure lowering and other important biological activities. my country has approved the use of roselle red pigment as a food additive [GB / T12493-1990 (08.125)], and has been widely used in the coloring of dairy products, beverages, candies, prepared wine, jelly and other foods, but with the scope of application With continuous expansion, diffe...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 王少峰
Owner 漳州金三角生物科技有限公司
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