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Extraction method of anthocyanin from purple sweet potatoes

A purple sweet potato anthocyanin and extraction method technology, applied in the direction of organic chemistry, can solve the problems of juice separation difficulties, slow filtration speed, high impurity content, etc., and achieve the effect of facilitating purification, enhancing permeability, and reducing impurity content

Inactive Publication Date: 2017-08-29
JIANGSU XUHUAI DISTRICT XUZHOU AGRI SCI INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It has been mentioned in many studies that in order to improve the extraction rate of pigment, the processing of raw materials usually adopts beating and crushing method. The more fully the crushing, the better the extraction effect and the higher the yield, but at the same time, the finer the crushing, the better the juice separation. Difficult, not only requires multi-stage and multiple coarse filtration, fine filtration, slow filtration speed, high impurity content, difficult purification, but also consumes a large amount of extraction solvent, high cost and low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) material selection: select fresh purple-fleshed sweet potatoes without pests, rot, and mildew spots, and varieties with anthocyanin content greater than 100mg / 1000g;

[0019] (2) Freezing: Clean the sweet potatoes selected in step (1), cut into cubes with a side length of 3mm, put them into pure water with a pH value of 3.0 or 95% ethanol immediately after dicing, soak them for 10min, and remove them. Freeze at -18°C for 18 hours until all tissues are frozen;

[0020] (3) Juice separation: After thawing the frozen diced purple sweet potato, place it in a centrifuge at 3000rpm to separate the juice, collect the filtrate, which is rich in anthocyanins;

[0021] (4) Extraction: place the diced purple sweet potato after the juice separation in step (3) into an extraction solvent, extract for 40 minutes at 20°C, and further dissolve the residual anthocyanins in the diced purple sweet potato;

[0022] (5) Solid-liquid separation: the solid-liquid mixture obtained in step...

Embodiment 2

[0025] (1) material selection: select fresh purple-fleshed sweet potatoes without pests, rot, and mildew spots, and varieties with anthocyanin content greater than 100mg / 1000g;

[0026] (2) Freezing: Clean the sweet potatoes selected in step (1), cut into cubes with a side length of 6 mm, immediately drop into pure water with a pH value of 3.0 or 95% ethanol after dicing, soak them for 20 minutes, and remove them. Freeze at -22°C for 21 hours until all tissues are frozen;

[0027] (3) Juice separation: After thawing the diced purple sweet potato after freezing, place in a 4000rpm centrifuge to separate the juice and collect the filtrate;

[0028] (4) Extraction: place the diced purple sweet potato after the juice separation in step (3) into an extraction solvent, extract at 40°C for 140 minutes, and further dissolve the residual anthocyanins in the diced purple sweet potato;

[0029] (5) Solid-liquid separation: the solid-liquid mixture obtained in step (4) is placed in a 400...

Embodiment 3

[0032] (1) material selection: select fresh purple-fleshed sweet potatoes without pests, rot, and mildew spots, and varieties with anthocyanin content greater than 100mg / 1000g;

[0033] (2) Freezing: Clean the sweet potatoes selected in step (1), cut into cubes with a side length of 10 mm, and immediately drop into pure water with a pH value of 3.0 or 95% ethanol after dicing, soak them for 30 minutes, and remove them. Freeze at -25°C for 24 hours until all tissues are frozen;

[0034] (3) juice separation: after thawing the diced purple sweet potato after freezing, place in the centrifuge of 5000rpm to carry out juice separation, collect filtrate;

[0035] (4) Extraction: place the diced purple sweet potato after the juice separation in step (3) into an extraction solvent, extract at 60°C for 240 minutes, and further dissolve the residual anthocyanins in the diced purple sweet potato;

[0036] (5) Solid-liquid separation: the solid-liquid mixture obtained in step (4) is plac...

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Abstract

The invention provides an extraction method of anthocyanin from purple sweet potatoes. The extraction method includes six steps: material selection, freezing, juice and liquid separation, re-extraction, re-separation of juice and liquid, and filtration and concentration. Compared with a pulping disruption method in the prior art, in the method, the purple sweet potatoes are cut into dices, are frozen and are subjected to the juice and liquid separation and anthocyanin extraction, so that tissue cells are disrupted microscopically, permeability of tissue is improved, dissolution-out of a tissue liquid and extraction rate of the anthocyanin are greatly increased and consumption of an extraction solvent is reduced. Meanwhile, the method macroscopically maintains the completeness of tissue forms and has convenience on filtration. The method is especially suitable for juice and liquid separation in a manner of high-speed centrifugation. The content of impurities in the extract liquid is low, so that further purification of the anthocyanin is easy and efficiency is increased.

Description

technical field [0001] The invention relates to an extraction method, in particular to a purple sweet potato anthocyanin extraction method, and belongs to the technical field of deep processing of agricultural products. Background technique [0002] Studies have shown that anthocyanins have many medical and nutritional health values ​​such as anti-oxidation, anti-tumor, lowering blood pressure, lowering blood sugar and enhancing immunity. Extracting anthocyanins from purple sweet potato is one of the most widely used processing methods of purple sweet potato. Common extraction methods include water extraction, organic solvent extraction and supercritical CO2 extraction. [0003] It has been mentioned in many studies that in order to improve the extraction rate of pigment, the processing of raw materials usually adopts beating and crushing method. The more fully the crushing, the better the extraction effect and the higher the yield, but at the same time, the finer the crushi...

Claims

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Application Information

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IPC IPC(8): C07D311/62
CPCC07D311/62
Inventor 徐飞钮福祥岳瑞雪孙健朱红张毅张文婷
Owner JIANGSU XUHUAI DISTRICT XUZHOU AGRI SCI INST
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