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Method for auxiliary extraction of chufa husk natural brown vegetarian with ultrasound wave

An auxiliary extraction, water chestnut skin browning technology, applied in the direction of natural dyes, chemical instruments and methods, azo dyes, etc., can solve the problems of low extraction efficiency, shortened extraction time, and poor separation effect

Inactive Publication Date: 2008-09-24
HEZHOU UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The extraction methods of natural pigments mainly include water extraction and organic solvent extraction, but there are disadvantages such as long extraction time, low extraction efficiency, and poor separation effect.
Ultrasonic extraction can accelerate the natural pigment into the solvent, improve the extraction efficiency, and shorten the extraction time. At present, there are no reports of ultrasonic-assisted extraction of brown pigment from water chestnut skin at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0015] Get water chestnut skin dry powder raw material 50g, put into extraction tank, add 70% edible ethanol 500g, under the condition that temperature is 50 ℃, power is 60W, and duty cycle is 80% ultrasonic extraction 50min, extract is filtered, repeat 3 times, the extracts were combined, the filtrate was distilled under reduced pressure, concentrated to 25 degrees Baume, and ethanol was recovered at the same time, the concentrated solution was dried to obtain 11g of the crude brown pigment of water chestnut skin, and the crude brown pigment of water chestnut skin was placed in the extraction tank , add 100g of 95% edible ethanol, heat to boiling and reflux for 1h, filter to get the filtrate after cooling, repeat 2 times, concentrate the filtrate, recover ethanol, dry the concentrated solution to obtain 8.5g of refined water chestnut skin brown pigment.

Embodiment approach 2

[0017] Get water chestnut skin dry powder raw material 30g, put into extraction tank, add 60% edible ethanol 400g, under the condition that temperature is 60 ℃, power is 70W, and duty cycle is 70% ultrasonic extraction 40min, extract is filtered, repeat 2 times, the extracts were combined, the filtrate was distilled under reduced pressure, concentrated to 24 Baume degrees, and ethanol was recovered at the same time, the concentrated solution was dried to obtain 7.5g of the crude brown pigment of water chestnut skin, and the crude brown pigment of water chestnut skin was placed in the extraction tank Add 60g of 95% edible ethanol, heat to boiling and reflux for 1h, filter and take the filtrate after cooling, repeat 3 times, concentrate the filtrate, recover ethanol, dry the concentrated solution, and obtain 6g of refined water chestnut skin brown pigment.

Embodiment approach 3

[0019] Get water chestnut skin dry powder raw material 40g, put into extraction tank, add 50% edible ethanol 360g, under the condition that temperature is 70 ℃, power is 80W, and duty ratio is 60% ultrasonic extraction 60min, extract is filtered, repeat 3 times, the extracts were combined, the filtrate was distilled under reduced pressure, concentrated to 25 degrees Baume, and ethanol was recovered at the same time, the concentrated solution was dried to obtain 8g of the crude brown pigment of water chestnut skin, and the crude brown pigment of water chestnut skin was placed in the extraction tank , add 80g of 98% edible ethanol, heat to boiling and reflux for 1h, filter to get the filtrate after cooling, repeat 2 times, concentrate the filtrate, recover ethanol, dry the concentrated solution to obtain 6.5g of refined water chestnut skin brown pigment.

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Abstract

The invention relates to a method used for extracting eleocharis turerosa peel natural brown pigment with ultrasonic wave, which belongs to the technical field of food additive and is characterized by cavitation effect and mechanical effect produced by the ultrasonic wave; edible ethanol solution is adopted as a solvent to extract the eleocharis turerosa peel brown pigment with the ultrasonic wave at the temperature of 50 DEG C to 70 DEG C, the power of 60W to 80W and 60 percent to 80 percent of duty ratio; decompression and distillation are conducted to reclaim the ethanol; the extraction time is one tenth of that of the common extracting method; the yield is 20 percent to 25 percent; the invention is easy for industrialized production, changes the eleocharis turerosa peel which is always taken as waste into valuable; the obtained product is water-soluble natural brown pigment, has antibacterial effect and antioxidation activity, and is suitable to serve as colorant and additive of all kinds of foods.

Description

1. Technical field [0001] The invention relates to a method for extracting natural food pigment, which belongs to the technical field of food additives, in particular to a method for ultrasonically assisted extraction of natural brown pigment from water chestnut skin. 2. Technical background [0002] Water chestnut (Eleochairis toberosa), also known as Water chestnut, is the underground corm of water chestnut, a perennial aquatic herb of Cyperaceae. It is cultivated in all provinces south of the Yangtze River Basin in China, and the output of water chestnut in Guangxi accounts for more than 70% of China's . Water chestnuts are not only juicy, sweet and nutritious, but also have certain medicinal value. It is an excellent fruit and vegetable food with both medicine and food. It has been known as "Jiangnan ginseng" since ancient times. Traditional Chinese medicine believes that water chestnuts are cold in nature and sweet in taste, have the effects of clearing away heat, redu...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 罗杨合黄志强张志黄皓妍
Owner HEZHOU UNIV
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