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A limited metabolomics analysis validates sonication-assisted extraction of Ice Wine grape pomace polyphenols and demonstrates their seasonal variation
Journal of Food Measurement and Characterization ( IF 2.9 ) Pub Date : 2019-12-16 , DOI: 10.1007/s11694-019-00343-w
Jeffrey A. Stuart , Shehab Selim , Sam McGowan

Plant polyphenols have received a great deal of attention for their putative health-promoting effects. Grapes are a dietary source of polyphenols such as resveratrol, quercetin, catechin, and delphinidin. These compounds are particularly plentiful in the skins and seeds pomace) of grape berries. The levels of some polyphenols, like resveratrol, have been reported to increase in late fall and early winter. Here we developed a rapid and simple bath sonication-based method for extracting polyphenols from the pomace of Vidal and Cabernet Franc grapes into a 1.5% aqueous solution of beta-cyclodextrin (BCD). BCD is an inexpensive and generally recognized as safe food additive that is widely used in food manufacturing. Using a limited metabolomics approach, the levels of 28 individual polyphenols in these extracts were determined. We demonstrate a yield of 1.30–3.18 µg resveratrol per mg lyophilized extract from Cabernet Franc berries harvested between November and January. In addition, the extraction protocol developed yields measurable levels of polydatin, quercetin, catechin, delphinidin, and other polyphenols. The levels of many of these polyphenols vary significantly between November, December, and January based on data from 2015, 2016, and 2017. In summary, we demonstrate an efficacious method for extracting polyphenols from waste winter grape pomace that yields a wide range of polyphenols in an edible extract form and show how the levels of these polyphenols varies from November to January.

中文翻译:

有限的代谢组学分析验证了超声辅助提取冰酒果渣多酚的效果,并证明了其季节性变化

植物多酚因其促进健康的作用而受到了广泛关注。葡萄是白藜芦醇,槲皮素,儿茶素和飞燕草素等多酚的饮食来源。这些化合物在葡萄浆果的皮和种子渣中特别丰富。据报道,一些白藜芦醇等多酚的含量在秋末和初冬会增加。在这里,我们开发了一种基于浴超声处理的快速,简单的方法,该方法用于从Vidal和Cabernet Franc葡萄的果渣中提取多酚到1.5%的β-环糊精(BCD)水溶液中。BCD是一种廉价的食品,通常被认为是安全的食品添加剂,广泛用于食品生产中。使用有限的代谢组学方法,确定了这些提取物中28种单独的多酚的水平。我们证明,从11月至1月间收获的赤霞珠浆果中,每毫克冻干提取物的白藜芦醇产量为1.30-3.18 µg白藜芦醇。此外,开发的提取方案可产生可测量水平的多角蛋白,槲皮素,儿茶素,飞燕草素和其他多酚。根据2015年,2016年和2017年的数据,这些多酚中的许多多酚的含量在11月,12月和1月之间变化很大。总而言之,我们证明了一种有效的方法,该方法可从废弃的冬季葡萄渣中提取多酚,产生多种多酚。以可食用提取物的形式显示这些多酚的含量在11月至1月之间如何变化。开发的提取方案可产生可测量水平的多肽,槲皮素,儿茶素,飞燕草素和其他多酚。根据2015年,2016年和2017年的数据,许多这些多酚的水平在11月,12月和1月之间变化很大。总而言之,我们证明了一种有效的方法,该方法可从废弃的冬季葡萄渣中提取多酚,产生多种多酚。以可食用的提取物形式显示这些多酚的含量在11月至1月之间如何变化。开发的提取方案可产生可测量水平的多肽,槲皮素,儿茶素,飞燕草素和其他多酚。根据2015年,2016年和2017年的数据,这些多酚中的许多多酚的含量在11月,12月和1月之间变化很大。总而言之,我们证明了一种有效的方法,该方法可从冬​​季葡萄渣中提取多酚,产生多种多酚。以可食用的提取物形式显示这些多酚的含量在11月至1月之间如何变化。
更新日期:2019-12-16
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