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The concentrations of 15 polyphenols (the phenolic acids gentisic, vanillic, ferulic, m-coumaric, p-coumaric, caffeic, and gallic acid; the trihydroxystilbenes cis- and trans-resveratrol and cis- and trans-polydatin; and the flavonoids, catechin, epicatechin, quercetin, and morin) were measured in wines from a range of white (Chardonnay, Riesling, Seyval Blanc, Vidal) and red (Pinot Noir, Cabernet Sauvignon, Cabernet Franc, Merlot, Gamay Noir) cultivars grown in the viticultural region of Niagara, ON, Canada, to determine whether significant and characteristic differences in the content and relative patterns of individual polyphenols could be identified among the wines of various cultivars. An assay involving solid-phase extraction followed by derivatization and gas chromatography/mass spectrometry was used to quantify the polyphenols. Overlapping values between red and white wines were observed for gentisic …