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Proantocyanidins (PCs) found in plant products, are reported to be beneficial to human health. A thiolysis-HPLC method was developed to determine PC in health foods and the basic PC material, grape seed extract (GSE). PCs were quantitatively resolved by acid-catalysis in the presence of benzyl mercaptan as nucleophiles. The reaction solutions of actual purchased products were injected into an HPLC...
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