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Method for extracting procyanidine from folium ginkgo

A technology of proanthocyanidins and ginkgo leaves, applied in the direction of organic chemistry, etc., to achieve the effect of simple operation and short extraction time

Inactive Publication Date: 2014-04-30
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction of proanthocyanidins from ginkgo leaves by this method has not been reported yet

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ginkgo biloba leaves were taken, washed, dried at 60°C for 10 h, and crushed through an 80-mesh sieve. Weigh 0.5 g of ginkgo biloba powder, add it to a homogenizer, add 12.5 mL of absolute ethanol as a solvent, and mix. Start the homogenizer, set the rotation speed to 20000 r / min, and homogenize and extract at room temperature for 3 min. It is measured that under this method, the extraction rate of proanthocyanidins in ginkgo leaves is 2.3%.

Embodiment 2

[0026] Ginkgo biloba leaves were taken, washed, dried at 60°C for 10 h, and crushed through an 80-mesh sieve. Weigh 0.5 g of ginkgo leaf powder, add it to a homogenizer, add 20 mL of water, and mix. Start the homogenizer, set the rotation speed to 12000 r / min, and homogenize and extract at room temperature for 3 min. After the first extraction, the homogenate was centrifuged for solid-liquid separation, and the solid waste residue was collected, then 20 mL of water was added, mixed, and extracted at room temperature for 3 min at a speed of 12000 r / min. The extraction rate of proanthocyanidins was measured to be 2.6% after two extractions.

Embodiment 3

[0028] Ginkgo biloba leaves were taken, washed and dried at 60°C for 10 h, crushed and passed through a 60-mesh sieve. Weigh 0.5 g of ginkgo biloba powder, add it to a homogenizer, add 12 mL of absolute ethanol, and mix. Start the homogenizer, set the rotation speed to 10500 r / min, and homogenize and extract at 35°C for 3 min. After the first extraction, the homogenate was centrifuged for solid-liquid separation, and the solid waste residue was collected, then 12 mL of absolute ethanol was added, mixed, and extracted at 35°C for 3 min at a speed of 10500 r / min. The extraction rate of proanthocyanidins was measured to be 3.0% after two extractions.

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PUM

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Abstract

The invention provides a method for extracting procyanidine from folium ginkgo, which relates to a method for extracting the procyanidine, and is a new method for processing folium ginkgo powder in solvent and extracting the procyanidine from the folium ginkgo by using a high-speed homogenizer under the power of 185W. The method adopts a simple homogenization method to extract the procyanidine from the folium ginkgo, the operation is simple, the extracting time is short, expensive instruments are not needed, industrial production can be carried out, and the extraction rate of the procyanidine can reach 3 percent.

Description

technical field [0001] The invention relates to a method for extracting proanthocyanidins from ginkgo leaves. Background technique [0002] Proanthocyanidins (PC for short) are a large class of polyphenolic mixtures that widely exist in nature, and are formed by condensation of different amounts of catechin, epicatechin or gallic acid. Proanthocyanidins is one of the most effective natural free radical scavengers found so far. It is widely used in food, cosmetics and other fields due to its superior antioxidant properties, significant curative effect, and slight side effects. It is used as a nutritional enhancer, Natural preservatives, natural antioxidants, DNA protectants, etc. [0003] At present, proanthocyanidins are mainly extracted from grape seed (skin) and pine bark, and there are also reports of extracting from rapeseed skin. There are few studies on the method of extracting proanthocyanidins from ginkgo leaves, and according to literature reports, the content of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D311/62
Inventor 王燕芹徐莉曹福亮雷萌陈泳杨世龙蒋国斌唐颖汪贵斌
Owner NANJING FORESTRY UNIV