Comparison of the antioxidant properties and flavonols in various parts of Korean red onions by multivariate data analysis
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To compare the antioxidant properties and flavonols in various parts; dry skin (DS) and edible portion (EP), of 8 red onions (Allium cepa L, ROs), total content of phenolics (TPC), flavonoids (TFC), and anthocyanins (TAC) and DPPH radical scavenging properties were estimated and the content of six flavonols were quantified by HPLC–PDA analysis. The major component of DS and EP of RO was quercetin and quercetin-4′-glucoside, respectively. Score plots of the PCA and PLS-DA were segregated by flavonols content and antioxidant properties according to the EP and DS of ROs. Loading plot of the PCA showed that the quercetin and sum of flavonol content were highly correlated with antioxidant activity of ROs. Therefore, flavonol content and antioxidant activity can be used as markers for distinct parts of ROs.
KeywordsRed Allium cepa L. Antioxidants Principal component analysis Partial least squares discriminant analysis Quercetine
This research was supported by Golden Seed Project (Center for Horticultural Seed Development, No. 213003-04-3-WTB11), Ministry of Agriculture, Food and Rural Affairs (MAFRA), Ministry of Oceans and Fisheries (MOF), Rural Development Administration (RDA) and Korea Forest Service (KFS). And this work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) [grant number. NRF-2015R1D1A3A01020708].
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