Method for extracting cyanidin from purple yam peel

A technology of yam skin and anthocyanins, applied in the direction of organic chemistry, can solve the problems of waste of resources, etc., and achieve the effect of low cost, high extraction rate and purity, and simple operation

Inactive Publication Date: 2015-02-18
秦富英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the purple yam skin contains a large amount of anthocyanin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for extracting anthocyanins in purple yam skin, comprising the following steps:

[0018] (1) Select fresh, non-toxic purple yam skin, wash and remove impurities, crush it into powder, dry it in a drying oven at 50°C for 12 hours, pass it through an 80-mesh sieve, and store it in a dark place for later use;

[0019] (2) Accurately weigh the purple yam skin powder, add a 20% ethanol extractant with a concentration of 1:6 according to the ratio of material to liquid, place it in a constant temperature water bath at 50°C for 1.3 hours, and then filter to constant volume;

[0020] (3) Put the extract after filtering to constant volume in a rotary evaporator to evaporate and concentrate to obtain a paste, which can be dried to obtain anthocyanins.

Embodiment 2

[0022] A method for extracting anthocyanins in purple yam skin, comprising the following steps:

[0023] (1) Select fresh, non-toxic purple yam skin, wash and remove impurities, crush it into powder, dry it in a drying oven at 50°C for 12 hours, pass it through a 90-mesh sieve, and store it in a dark place for later use;

[0024] (2) Accurately weigh the purple yam skin powder, add a 30% ethanol extractant with a concentration of 1:8 according to the ratio of material to liquid, place it in a constant temperature water bath at 70°C for 1.5 hours, and then filter to constant volume;

[0025] (3) Put the extract after filtering to constant volume in a rotary evaporator to evaporate and concentrate to obtain a paste, which can be dried to obtain anthocyanins.

Embodiment 3

[0027] A method for extracting anthocyanins in purple yam skin, comprising the following steps:

[0028] (1) Select fresh, non-toxic purple yam skin, wash and remove impurities, crush it into powder, put it in a drying oven at 50°C for 12 hours, pass through a 100-mesh sieve, and put it in a dark place for use;

[0029] (2) Accurately weigh the purple yam skin powder, add a 25% ethanol extractant with a concentration of 1:7 according to the material-to-liquid ratio, place it in a constant temperature water bath at 60°C for 1.7 hours, and filter to constant volume;

[0030] (3) Put the extract after filtering to constant volume in a rotary evaporator to evaporate and concentrate to obtain a paste, which can be dried to obtain anthocyanins.

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PUM

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Abstract

The invention discloses a method for extracting cyanidin from purple yam peel, which comprises the following steps: (1) selecting purple yam peel, cleaning to remove impurities, pulverizing into powder, drying in a 50-DEG C drying box, passing through an 80-100-mesh screen, and keeping in a dark place for later use; (2) accurately weighing the purple yam peel powder, adding an ethanol extracting agent, leaching in a thermostatic water bath, filtering and diluting to a specific volume; and (3) concentrating the extracting solution by evaporation to obtain a paste, and drying to obtain the cyanidin. According to the influence of the extraction conditions on the cyanidin in the purple yam peel, the optimal extraction time, extraction temperature, material/liquid ratio and extracting agent concentration are adopted to ensure the higher extraction rate and purity of the cyanidin. The method is simple to operate and low in cost, avoids waste of resources, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for extracting pigments, in particular to a method for extracting anthocyanins from purple yam skin. Background technique [0002] Anthocyanins, also known as anthocyanins, are a class of water-soluble natural pigments widely present in plants in nature, and belong to flavonoid compounds. It is also the main coloring substance in plant petals, and most of the colorful colors of fruits, vegetables, and flowers are related to it. Anthocyanins exist in the vacuoles of plant cells and can be converted from chlorophyll. According to research, anthocyanins have the functions of anti-oxidation, anti-mutation, cancer prevention, improving sleep, improving circulation, improving vision, etc., and are widely used in medicine, health care products, cosmetics and other fields. The anthocyanins used in food, cosmetics and other industries are mostly synthetic pigments, almost all of which are toxic to varying degrees. Long-term u...

Claims

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Application Information

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IPC IPC(8): C07D311/62
CPCC07D311/62
Inventor 秦富英
Owner 秦富英
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