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Method for preparing gardenia vegetable dye

A plant dye, the technology of gardenia, which is applied in the field of preparation of gardenia plant dyes, can solve the problems of greening of noodle products, and achieve the effect of less impurities, good dyeing property and high purity

Inactive Publication Date: 2014-02-26
邓江莲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If gardenia yellow pigment is used in pasta, it will cause green discoloration of pasta products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 1) Crush the dried gardenia fruit, put it in a paper tube made of filter paper, then put it into a Soxhlet extractor, use ether as a degreasing agent, the ratio of solid to liquid is 1:3g / ml, and heat to reflux at 40°C Degrease until the solution is colorless, and take the degreased filter cake for subsequent use;

[0016] 2) After drying the filter cake, add 40% methanol for leaching for 20 hours, the amount of methanol used is 5 times the weight of the filter cake, filter the extract, and concentrate the filtrate into an extract with a relative density of 1.12;

[0017] 3) Dissolve the extract in 10 times the volume of 95v% ethanol, let it settle for precipitation, filter, concentrate the filtrate, and spray dry to obtain the crude product;

[0018] 4) Dissolve the crude product in 1mol / L NaOH solution, then adjust the pH to 3 with acid, let it stand for precipitation, filter, neutralize the filter residue with alkali to neutral, and spray dry to obtain gardenia yello...

Embodiment 2

[0020] 1) Crush the dried gardenia fruit, put it in a paper tube made of filter paper, then put it into a Soxhlet extractor, use ether as a degreasing agent, the ratio of solid to liquid is 1:4g / ml, and heat to reflux at 50°C Degrease until the solution is colorless, and take the degreased filter cake for subsequent use;

[0021] 2) After drying the filter cake, add 50% methanol for leaching for 24 hours. The amount of methanol used is 8 times the weight of the filter cake, filter the extract, and concentrate the filtrate into an extract with a relative density of 1.15;

[0022] 3) Dissolve the extract in 15 times the volume of 95v% ethanol, let it settle for precipitation, filter, concentrate the filtrate, and spray dry to obtain the crude product;

[0023] 4) Dissolve the crude product in 2mol / L NaOH solution, then adjust the pH to 6 with acid, let it stand for precipitation, filter, neutralize the filter residue with alkali to neutral, and spray dry to obtain gardenia yello...

Embodiment 3

[0025] 1) Crush the dried gardenia fruit, put it in a paper tube made of filter paper, then put it into a Soxhlet extractor, use ether as a degreasing agent, the ratio of solid to liquid is 1:3.2g / ml, and heat at 45°C Reflux and degrease until the solution is colorless, and get the degreased filter cake for subsequent use;

[0026] 2) After drying the filter cake, add 45% methanol for leaching for 22 hours, the amount of methanol used is 6 times the weight of the filter cake, filter the extract, and concentrate the filtrate into an extract with a relative density of 1.14;

[0027] 3) Dissolve the extract in 12 times the volume of 95v% ethanol, let it settle for precipitation, filter, concentrate the filtrate, and spray dry to obtain the crude product;

[0028] 4) Dissolve the crude product in 1.5mol / L NaOH solution, then adjust the pH to 5 with acid, let it stand for precipitation, filter, neutralize the filter residue with alkali to neutral, and spray dry to obtain gardenia y...

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Abstract

The invention provides a method for preparing a gardenia vegetable dye. The method comprises the following steps: (1) grinding and degreasing dried gardenia fruits, to obtain a filter cake; (2) drying the filter cake, adding methanol for leaching for 20-24 hours, filtering the extracting solution, and concentrating the filtrate into an extract with the relative density of 1.12-1.15; (3) dissolving the extract into 95v% ethanol, standing, precipitating, filtering, concentrating the filtrate, performing spray drying, thus obtaining a crude product; and (4) dissolving the crude product in a NaOH solution, regulating the pH to 3-6 by using an acid, standing, precipitating, filtering, neutralizing the filter residue to be neutral by using alkali and performing spray drying, thus obtaining gardenia yellow pigment. The extracted gardenia yellow pigment is high in purity, low in impurity content and stable in property, has high dyeing property to proteins and starch and can be widely applied to candies, preserved fruits, ice creams and the like.

Description

technical field [0001] The invention belongs to the technical field of light chemical dyes, and in particular relates to a preparation method of gardenia plant dyes. Background technique [0002] Gardenia is a Rubiaceae gardenia plant, an evergreen shrub of the Rubiaceae family, born in the mountains, with strong adaptability, and widely distributed in tropical and subtropical regions. Gardenia belongs to the first batch of medicinal and edible resources promulgated by the Ministry of Health, and is a traditional Chinese medicine. It is recorded in detail in "Compendium of Materia Medica" that gardenia has the functions of protecting the liver, lowering blood pressure, benefiting the gallbladder, calming nerves, eliminating redness and swelling, and stopping bleeding. Traditional Chinese medicine has found that gardenia can be used to treat jaundice hepatitis, high blood pressure, sprains, diabetes and other diseases. Modern medicine has also found that gardenia has inhibi...

Claims

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Application Information

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IPC IPC(8): C09B61/00
Inventor 邓江莲
Owner 邓江莲
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