Method for extracting pitaya peel pigment by supercritical CO2 fluid

A dragon fruit peel, supercritical technology, applied in chemical instruments and methods, bulk chemical production, azo dyes, etc., can solve the problems of complex purification process, low purity of extracted pigments, difficult industrial production, etc., and achieve enhanced extraction rate. Effect

Active Publication Date: 2014-01-08
FOSHAN POLYTECHNIC
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Problems solved by technology

[0006] The object of the present invention is to provide a kind of utilizing supercritical CO 2 The method for extracting pitaya peel pigment by fluid is aimed at solving technical probl

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  • Method for extracting pitaya peel pigment by supercritical CO2 fluid

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[0038] Example 1

[0039] Take the dragon fruit peel, crush and dry to obtain the dragon fruit peel powder, the powder mesh number is 150 mesh; the dragon fruit peel powder is subjected to supercritical CO 2 Fluid extraction, adding polar additive ethanol during the extraction process, including supercritical CO 2 The amount of fluid is 1.2 times that of the polar entrainer ethanol. During the extraction process, the parameters of the extraction equipment are: extraction pressure 30Mpa, extraction temperature 50℃, extraction time 3h, CO 2 The flow rate is 15kg / h. After the extraction is completed, the pitaya peel pigment solution and the raffinate are obtained, and the pitaya peel pigment solution is collected for use; 95% ethanol is added to the raffinate to obtain the raffinate ethanol solution, in which ethanol The amount of the raffinate is 50% of the raffinate. The ethanol solution of the raffinate is ultrasonically strengthened to obtain the pitaya peel pigment solution. The ...

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Abstract

The invention discloses a method for extracting pitaya peel pigment by supercritical CO2 fluid, which comprises the following steps: A. taking pitaya peel, crushing and drying the peel to obtain pitaya peel powder; B. performing supercritical CO2 fluid extraction of the pitaya peel powder, adding polar entrainer during the extraction to obtain a pitaya peel pigment solution and extract, collecting the pitaya peel pigment solution to keep in reserve; C. adding 95% ethanol into the extract to obtain an extract ethanol solution, performing ultrasonic enhancement of the extract ethanol solution to obtain the pitaya peel pigment solution; D. mixing the pitaya peel pigment solutions obtained in B and C, and performing reduced pressure distillation and rotary evaporation to obtain the pitaya peel pigment. With the method of the invention, high-concentration pitaya peel pigment can be obtained, and the method of the invention is suitable for large-scale production, and facilitates popularization and application.

Description

technical field [0001] The present invention relates to a kind of method for extracting pitaya peel pigment, what relate in particular to is a kind of using supercritical CO 2 A method for fluid extraction of pitaya peel pigment. Background technique [0002] Pitaya peel contains a large amount of red pigment. Extracting natural pigment from its peel can not only realize the comprehensive utilization of dragon fruit, increase the added value of dragon fruit, but also reduce environmental pollution, which is of great significance in production. [0003] Pitaya pigment is a water-soluble pigment, soluble in methanol, ethanol, acetone and other water-miscible solvents. Dragon fruit pigment also has the pH color reactivity of betaine pigment: that is, it is transparent and bright yellow in the alkaline pH range. Moreover, the maximum absorption wavelength of dragon fruit in the visible light region is 538nm. [0004] At present, the production of natural pigments is mainly bas...

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Application Information

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IPC IPC(8): C09B61/00
CPCY02P20/54
Inventor 齐明赵雪章郑琳刘建楠熊瑛付博
Owner FOSHAN POLYTECHNIC
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