Method for extracting haematochrome from purple sweet potato

An extraction method, the technology of purple sweet potato, is applied in the field of natural pigment extraction, which can solve the problems of unsatisfactory extraction rate and complicated process, and achieve the effect of low production cost, simple process steps and high color price

Inactive Publication Date: 2011-03-30
桂林市振达生物制药有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This method of extracting purple sweet potato red pigment with citric acid aqueous solution solves

Method used

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  • Method for extracting haematochrome from purple sweet potato

Examples

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Example Embodiment

[0027] Example 1

[0028] According to the solid-liquid ratio of 1:10, the purple sweet potato was placed in a citric acid aqueous solution with a mass concentration of 0.8% and mashed, extracted at an ultrasonic frequency of 100KHz for 90min, filtered, and the extraction rate in the extract was measured to be 97%. The extract was centrifuged at 1000r / min for 20min, and the supernatant was separated and purified by a ceramic ultrafiltration membrane with a molecular weight cut-off of 100KDa, and concentrated in vacuo at 40°C to obtain purple sweet potato red pigment. According to formula 1, its color value is 51.

Example Embodiment

[0029] Example 2

[0030] According to the solid-liquid ratio of 1:20, the purple sweet potato was placed in an aqueous solution of citric acid with a mass concentration of 0.4% and mashed, extracted at an ultrasonic frequency of 20KHz for 30min, filtered, and the extraction rate in the extract was measured to be 96.5%. The extract was centrifuged at 10,000 r / min for 5 min, and the supernatant was separated and purified by a polyethersulfone ultrafiltration membrane with a molecular weight cut-off of 20KDa, and concentrated in vacuo at 40°C to obtain purple sweet potato red pigment. According to formula 1, its color value is 53.

Example Embodiment

[0031] Example 3

[0032] According to the solid-liquid ratio of 1:8, the purple sweet potato was placed in a citric acid aqueous solution with a mass concentration of 0.2% and mashed, extracted under the ultrasonic frequency of 60KHz for 120min, filtered, and the extraction rate in the extract was measured to be 95.5%. The extract was centrifuged at 20,000 r / min for 10 min, and the supernatant was separated and purified by a ceramic ultrafiltration membrane with a molecular weight cut-off of 40 KDa, and concentrated in vacuo at 40 °C to obtain purple sweet potato red pigment. According to formula 1, its color value is 54.

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Abstract

The invention relates to a method for extracting a natural pigment, in particular to method for extracting haematochrome from a purple sweet potato, which comprises the steps of: smashing the purple sweet potato in an aqueous solution of citric acid, extracting for 10-120min at an ultrasonic frequency of 20-150KHz, filtering, centrifuging extraction liquid, separating and purifying supernate with an ultrafiltration membrane, and carrying out vacuum concentration to obtain the haematochrome of the purple sweet potato, wherein the mass concentration of the aqueous solution of citric acid is 0.2-0.8 percent, and the solid and liquid ratio of the purple sweet potato to the aqueous solution of citric acid is 1:5-1:20. The haematochrome of the purple sweet potato is extracted rapidly under an ultrasound state after the purple sweet tomato is smashed, cell walls of the purple sweet tomato can be rapidly damaged through impact waves and shearing forces generated by cavatition produced by the ultrasound in the aqueous solution of citric acid to ensure that the haematochrome of the purple sweet potato is rapidly and more completely dissolved out, thus by adopting the method, higher extraction rate can be obtained in a shorter time. The method has the advantages of simple steps, easy control and low production cost.

Description

technical field [0001] The invention relates to a method for extracting natural pigments, in particular to a method for extracting purple sweet potato red pigments. Background technique [0002] Purple sweet potato red pigment is a natural pigment extracted from the roots, stems and leaves of purple sweet potato. It is bright and natural in color, non-toxic, and has no special smell. It is an ideal natural food coloring resource and has been widely used in the food industry. middle. At the same time, because purple sweet potato red pigment has physiological functions such as anti-mutation, anti-oxidation and anti-tumor, it has also been widely used in the pharmaceutical and cosmetic industries. [0003] At present, acidified ethanol or acidified methanol is mostly used for the extraction of purple sweet potato red pigment, which causes solvent residue to a certain extent, and the extraction rate is not very high. In recent years, there has been a method of using citric aci...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 唐江明罗增桂白玭黄素春张华驱
Owner 桂林市振达生物制药有限公司
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