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Ultrasonically Assisted Extraction of Proanthocyanidins From Grape Seeds

Author: WangZhenYang
Tutor: ZhangShiRun；QianXueRen
School: Northeast Forestry University
Course: Forest Chemical Process Engineering
Keywords: Ultrasonic extraction Grape seed Proanthocyanidins Extraction rate
CLC: O629
Type: Master's thesis
Year: 2002
Downloads: 680
Quote: 13
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Abstract


This paper studies under normal ultrasound as an adjunct extracted from defatted grape seed proanthocyanidins approach. Proanthocyanidins extracted at 280nm and 550nm , respectively, at ultraviolet and visible spectrophotometry quantification. The results showed that ultrasonic cavitation help to enhance the penetration of solvent on the plant tissue and the destruction of the cell wall , promote the release of the active ingredient and shorten the extraction time , at a lower temperature in the original proanthocyanidins extracted from grape seeds . On product performance liquid chromatography and infrared spectroscopy preliminary analysis indicates that under the experimental conditions in the paper of ultrasound on the structure and composition of proanthocyanidins no significant effect . At room temperature under conditions of procyanidins extraction rate effect factor. The moisture content was 14.1% of grape seed , with acetone - water mixtures as extraction agent, the acetone concentration of 70 % of its best : ethanol - water mixtures as extraction agent, the concentration of 60% ethanol extraction the good . Two solvents for extraction of proanthocyanidins comparison showed that 70 % acetone solution on the selectivity of procyanidins than 60% ethanol solution . Purity of the product were acetone ultrasonic method > acetone concussion France > ethanol ultrasonic method > ethanol shock method . For acetone extraction, ultrasonic product purity of 43.32% , the shock was 38.04% purity law : For ethanol extraction, ultrasonic product purity of 35.16% , the shock method was 31.65% purity . Ultrasonic extraction of procyanidins improve yield and purity .

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Natural compounds
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