Boussetta Nadia, Lebovka Nikolaï, Vorobiev Eugène, Adenier Hervé, Bedel-Cloutour Catherine, Lanoisellé Jean-Louis
Unité Transformations Intégrées de la Matière Renouvelable and UMR 6022-CNRS, Génie Enzymatique et Cellulaire, Université de Technologie de Compiègne, Centre de Recherches de Royallieu, B.P. 20529, 60205 Compiègne Cedex, France.
J Agric Food Chem. 2009 Feb 25;57(4):1491-7. doi: 10.1021/jf802579x.
The objective of this study was to investigate the effects of pulsed electric field (PEF) and high-voltage electrical discharges (HVED) application on the efficiency of aqueous extraction of total soluble matter and polyphenols from grape skins ( Vitis vinifera L.) at different temperatures within 20-60 degrees C. The highest level of polyphenol concentration C was reached after about 60 min of extraction for HVED treatment: C(HVED) = 21.4 +/- 0.8 micromol of gallic acid equivalent (GAE)/g of dry matter (DM). Almost the same level of C was reached after 180 min of extraction for the PEF-treated skins. These levels exceeded the value C = 19.1 +/- 0.5 micromol of GAE/g of DM for the untreated samples. The difference between degrees Brix values for HVED-treated and untreated systems decreased with temperature increase (from 40 to 60 degrees C), but a large difference in the total amount of polyphenols was observed for HVED-treated and untreated systems. The activation energies were W(u) = 31.3 +/- 3.7 kJ/mol and W(PEF) = 28.9 +/- 5.5 kJ/mol for untreated and PEF-treated systems, respectively.
本研究的目的是调查脉冲电场（PEF）和高压放电（HVED）处理对在20至60摄氏度不同温度下从葡萄皮（Vitis vinifera L.）中提取总可溶性物质和多酚的水提取效率的影响。对于HVED处理，在提取约60分钟后达到最高多酚浓度C：C（HVED）= 21.4±0.8微摩尔没食子酸当量（GAE）/克干物质（DM）。对于PEF处理的葡萄皮，在提取180分钟后达到几乎相同的C水平。这些水平超过了未处理样品的C = 19.1±0.5微摩尔GAE/克DM的值。HVED处理和未处理系统之间的波美度值差异随温度升高（从40至60摄氏度）而减小，但在HVED处理和未处理系统中观察到多酚总量存在很大差异。未处理和PEF处理系统的活化能分别为W（u）= 31.3±3.7千焦/摩尔和W（PEF）= 28.9±5.5千焦/摩尔。
