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Method for extracting chestnut shell brown pigment

An extraction method and technology of chestnut shells, which are applied in the field of extraction of brown pigment from chestnut shells, can solve the problems of poor water solubility of crude extracts, high concentration of lye, and complex processes, and achieve good water solubility, low cost, and simple extraction processes Effect

Inactive Publication Date: 2009-04-15
BEIJING UNIV OF AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) The crude extract has poor water solubility and precipitates after dissolution;
[0005] (2) Resin adsorption is adopted for purification and refining, the process is complicated and the cost is high;
[0006] (3) The concentration of the lye used for the extractant is high, which involves subsequent recovery problems

Method used

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  • Method for extracting chestnut shell brown pigment

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Chestnut shells crushed to 60 meshes and dilute alkali ethanol solution (30% ethanol; pH=8) are extracted for the first time at a weight-to-volume ratio of 1:10, heated at 70°C for 4 hours, and left to stand for the first time After 1 hour, filter and save the first extraction solution; filter the filter residue after the first extraction and dilute alkali ethanol solution (30% ethanol; pH=8) according to the ratio of 1:7 by weight to volume, and carry out the second extraction. For the second extraction, heat at 70°C for 2 hours, filter after standing for the second time for 3 hours, save the second extract, and combine the two filtered extracts; put the combined extract at 60°C Concentrate by rotary evaporation at 60°C, then vacuum-dry at 60°C to make the water content by weight 10%, and finally pulverize into a powder with a fineness of 60 meshes.

Embodiment 2

[0036] Chestnut shells crushed to 80 meshes and dilute alkali-ethanol solution (40% ethanol; pH=8.5) are extracted for the first time at a weight-to-volume ratio of 1:15, heated at 75°C for 3 hours, and left to stand for the first time After 2 hours, filter and save the first extraction solution; filter the filter residue after the first extraction and dilute alkali ethanol solution (40% ethanol; pH=8.5) according to the ratio of 1:6 by weight to volume, and carry out the second extraction. For the second extraction, heat at 75°C for 3 hours, filter after standing for 2 hours for the second time, save the second extraction solution, and combine the two filtered extraction solutions; put the combined extraction solution at 60°C Concentrate by rotary evaporation at 70°C, then vacuum-dry at 70°C to make the water content by weight 9%, and finally pulverize into a powder with a fineness of 70 meshes.

Embodiment 3

[0038] Chestnut shells crushed to 40 meshes and dilute alkali ethanol solution (50% ethanol; pH=9) are extracted for the first time at a weight-to-volume ratio of 1:20, heated at 80°C for 2 hours, and left to stand for the first time After 3 hours, filter and save the first extraction solution; filter the filter residue after the first extraction and dilute alkali ethanol solution (50% ethanol; pH=9) according to the ratio of 1:5 by weight to volume, and carry out the second extraction. For the second extraction, heat at 80°C for 4 hours, filter after the second standing still for 1 hour, save the second extraction solution, and combine the two filtered extraction solutions; put the combined extraction solution at 60°C Concentrate by rotary evaporation at 75°C, then vacuum-dry at 75°C to make the water content by weight 8%, and finally pulverize into a powder with a fineness of 80 meshes.

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Abstract

The invention relates to an extraction method of brown pigment from chestnut shells, which comprises the steps: the first extraction of the chestnut shells is carried out by using dilute alkaline base-alcohol solution, the first still placement and the filtration are carried out, and a first liquid extract is preserved; the second extraction is carried out to filtration residues after the first extraction and the filtration by using the dilute alkaline base-alcohol solution, the cumulative time of the two times of the extraction is 6 hours, the second still placement and the filtration are carried out, a second liquid extract is preserved, and the liquid extracts after the two times of the filtration are merged; and the merged liquid extract is smashed into powder after the concentration and the drying. The extraction process is simple, the cost is low, higher color value can be achieved by only one extraction, and the extracted pigment product has good quality and good stability, thereby being capable of being promoted in the industrial production of food additives and providing a chestnut appreciation way for deep processing enterprises.

Description

technical field [0001] The invention relates to a method for extracting a food additive, that is, edible brown pigment, in particular to a method for extracting brown pigment from chestnut shells. Background technique [0002] In food coloring, the proportion of brown pigment is considerable. Due to the safety problems of synthetic brown pigments on human body, the number of approved uses is less and less, and the development and utilization of natural brown pigments has become a development trend. As a natural brown pigment, chestnut shell pigment has obvious advantages compared with synthetic brown pigment, and can be used to replace synthetic brown pigment in food. my country is rich in chestnut resources, so the deep processing of chestnut pulp has attracted much attention, but the resulting chestnut shells have not been fully and rationally utilized. Therefore, extracting pigments from chestnut shells is not only conducive to improving the comprehensive utilization val...

Claims

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Application Information

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IPC IPC(8): C09B61/00A23L1/27A23L5/40
Inventor 綦菁华黄漫青王芳庞美霞徐艺青
Owner BEIJING UNIV OF AGRI
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