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Method of extracting natural yellow pigment from persimon leaf or persion bark

A technology for natural yellow and persimmon peels, applied in natural dyes, chemical instruments and methods, azo dyes, etc., can solve the problems of low extraction efficiency and low product purity, improve the extraction rate, shorten the extraction time, avoid the effect of destruction

Inactive Publication Date: 2008-08-27
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, according to literature reports, the extraction method of yellow pigment generally adopts solvent direct extraction, the product purity is low, and the extraction efficiency is low, and it is not suitable as the technology and method for preparing persimmon yellow pigment with persimmon leaves and persimmon skin as raw materials

Method used

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  • Method of extracting natural yellow pigment from persimon leaf or persion bark

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Preparation: Wash 25g of persimmon leaves or persimmon skin, dry, pulverize, add 50mL of dry weight of raw materials into water and mix;

[0025] b. Freezing-thawing: Put the mixture of feed and liquid into the refrigerator below -4°C. After it is completely frozen, heat it in a water bath to make it melt quickly, and stir it, repeating it twice;

[0026] c. Water leaching: Add 50mL of water to the above feed-liquid mixture, extract twice in a water bath at 30°C-55°C, 1 hour each time; then centrifuge the extract to collect the supernatant, precipitate and repeat the extraction Twice, the supernatant was combined and concentrated under reduced pressure to obtain a concentrated solution;

[0027] d. Extraction and refinement: add an equal volume of 95% ethanol to the concentrated solution and repeatedly extract twice, each time for 30 minutes, and collect the extract;

[0028] e. Concentration and drying: Concentrate the extract on a water bath into a paste with a wa...

Embodiment 2

[0030] a. Material preparation: Wash 25g of persimmon leaves or persimmon skin, dry, pulverize, add 75mL of dry weight of raw materials into water and mix;

[0031] b. Freezing-thawing: Put the mixture of feed and liquid into the refrigerator below -4°C. After it is completely frozen, heat it in a water bath to make it melt quickly, and stir it, repeating it twice;

[0032] c. Water leaching: Add 75mL of water to the above feed-liquid mixture, and extract twice in a water bath at 30°C to 55°C, each time for 1 hour; then centrifuge the leachate to collect the supernatant, precipitate and repeat the leaching Twice, the supernatant was combined and concentrated under reduced pressure to obtain a concentrated solution;

[0033] d. Extraction and refinement: add twice the volume of propylene glycol to the concentrated solution and repeatedly extract twice, each time for 30 minutes, and collect the extract;

[0034] e. Concentration and drying: Concentrate the extract on a water ba...

Embodiment 3

[0036] a. Preparation: Wash 25g of persimmon leaves or persimmon skin, dry, pulverize, add 50mL of dry weight of raw materials into water and mix;

[0037] b. Freezing-thawing: Put the mixture of feed and liquid into the refrigerator below -4°C. After it is completely frozen, heat it in a water bath to make it melt quickly, and stir it, repeating it twice;

[0038] c. Water leaching: Add 150mL of water to the above-mentioned feed-liquid mixture, extract twice in a water bath at 30°C-55°C for 2 hours each time; then centrifuge the extract to collect the supernatant, precipitate and repeat the extraction Twice, the supernatant was combined and concentrated under reduced pressure to obtain a concentrated solution;

[0039] d. Extraction and refinement: add twice the volume of n-butanol to the concentrated solution and repeatedly extract twice, each time for 30 minutes, and collect the extract;

[0040] e. Concentration and drying: Concentrate the extract on a water bath into a p...

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Abstract

The present invention relates to a method for extracting natural yellow coloring matter from persimmon leaf and persimmon peel by mainly utilizing freezing and thawing process. It is characterized by that said method includes the following steps: cleaning persimmon leaf and peel, drying, pulverizing, adding water and mixing them, freezing mixture, heating in water bath, quickly-thawing said mixture, making water extraction and obtaining concentrated liquor, adding organic solvent to make extraction, concentrating and drying so as to obtain persimmon yellow color matter solid.

Description

technical field [0001] The invention relates to a method for extracting natural yellow pigment from persimmon leaves or persimmon skins, mainly using a freezing-thawing method. Background technique: [0002] Food coloring is divided into two categories according to different sources, namely food natural coloring and food synthetic coloring. Because synthetic pigments are potentially harmful to the human body, some European countries have completely banned the use of synthetic pigments, and my country has also limited and banned them. Therefore, it is a new trend in the development of the world today to utilize non-toxic and harmless natural substances to extract natural food coloring. The natural edible yellow pigments that have been developed in recent years include gardenia yellow pigment (CN1151420A), corn yellow pigment (CN1424361A), and flower yellow pigment (CN1084865A). [0003] Persimmon, also known as Zhuguo, belongs to the Persimmon family Persimmonaceae. It is n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B61/00
Inventor 岳红李晓银
Owner NORTHWESTERN POLYTECHNICAL UNIV
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