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Principal component analysis of the contents of bound phenolic acids in different oat products. A, C and E are score plots and B, D and F the corresponding loading plots. Letters on loading plots represent phenolic acids: A, 4-hydroxybenzoic acid; B, caffeic acid; C, vanillic acid; D, 4-hydroxybenzaldehyde; E, syringic acid; F, p-coumaric acid; g, vanillin; h, ferulic acid; I, sinapic acid.
