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首页> 外文期刊>Separation and Purification Technology >Intensification of polyphenols extraction from grape seeds by high voltage electrical discharges and extract concentration by dead-end ultrafiltration
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Intensification of polyphenols extraction from grape seeds by high voltage electrical discharges and extract concentration by dead-end ultrafiltration

机译：高压放电强化葡萄籽中多酚的提取，末端超滤则浓缩提取物

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摘要

Grape seed is a rich source of polyphenols. In this study, the high voltage electrical discharges (HVED) were used as alternative method for polyphenols extraction from grape seeds. The extraction efficiency was evaluated by conductivity disintegration index Z and polyphenols concentration in extracts. It was shown that HVED treatment permits effective extraction of polyphenols from grape seeds. The maximal concentration of extracted polyphenols reached 8.3 g GAE/100 w_(db) after 300 discharges. The extraction of polyphenols was satisfactorily described by the Peleg's model (R~2 > 0.995).Extracts obtained with HVED were then concentrated using membranes with different molecular weight cut off (0.15 μm, 150 and 50 kDa). The dead-end filtration of obtained extracts followed the cake filtration mechanism with membranes UP150 (150 kDa) and UV050 (50 kDa), and the combined mechanism (standard pore blocking/cake filtration) with FSMO, 15PP membrane (0.15 μm). The polyphenols content and physico-chemical properties of the permeates and retentates were evaluated. The polyphenols rejection of 87% and 91% were achieved with UP150 and UV050 membranes, respectively.
机译：葡萄籽是多酚的丰富来源。在这项研究中，高压放电（HVED）被用作从葡萄籽中提取多酚的替代方法。通过电导率崩解指数Z和提取物中的多酚浓度评估提取效率。结果表明，HVED处理可从葡萄籽中有效提取多酚。 300次放电后，提取的多酚的最大浓度达到8.3 g GAE / 100 w_（db）。用Peleg模型（R〜2> 0.995）令人满意地描述了多酚的提取，然后将HVED提取物用截留分子量不同（0.15μm，150和50 kDa）的膜进行浓缩。所得提取物的死端过滤遵循采用膜UP150（150 kDa）和UV050（50 kDa）的滤饼过滤机制，以及采用FSMO，15PP膜（0.15μm）的组合机制（标准孔封闭/滤饼过滤）。评价了渗透物和截留物的多酚含量和理化性质。 UP150和UV050膜分别实现了87％和91％的多酚截留率。

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