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The chromatographic separations showed the presence of eleven free phenolic acids (trans-cinnamic, o-coumaric, p-coumaric, chlorogenic, ferulic, gallic, caffeic, p-hydroxybenzoic, syringic, tannic and vanillic) in the walnut tissues. The p-hydroxybenzoic acid was a predominant compound in the green husks (618.8 µg·g-1), though, high content of it was found in leaves obtained in July (478.3 µg·g-1)...
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