Grape Seed Extracts (GSE) are known for their anti-oxidative and anti-inflammatory effects, and exert various physiological benefits including anti-carcinogenic, anti-aging, anti-diabetic, and cardioprotective effects. Grape pomace is the major byproduct of the wine and juice industry, which is rich in polyphenols including flavonoids (anthocyanins, flavanols, flavonols, and flavanones) and non-flavonoids (phenolic acids and their derivatives, stilbenes, and lignans). The total antioxidant content was higher in RGPE than WGPE. Furthermore, monogalloylated A-type dimers with (epi)cat and (epi)afz were detected in both GSE and WGPE.Ĭonclusion: RGPE contains relatively greater amounts of polyphenolics than WGPE, and more A-type PAC was detected in GSE. Other singly and doubly charged A-type PACs only detected in GSE. (epi)catechins, B-type PACs, A-type PAC dimers, and single A-type linked PAC trimers and tetramers were detected in RGPE, WGPE and Grape Seed Extract (GSE). ![]() Using direct-infusion electrospray ionization tandem mass spectrometry, glucosides of quercetin and peonidin were detected in both RGPE and WGPE, while quercetin, malvidin derivatives and petunidin 3- p-coumaroylgluside only found in RGPE. The total contents of polyphenolics, flavonoids and PAC and total antioxidant activities of Red Grape Pomace Extract (RGPE) were higher than those in White Grape Pomace Extract (WGPE). Methods and findings: The current study compared polyphenolics from different grape extracts and further characterized A-type Proanthocyanidins (PAC), which have not been studied previously. Background: Grape pomaces are rich sources of polyphenolics that are reportedly beneficial for health, but their content and quality between red and white pomaces have not been systemically compared.
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