Abstract
The antioxidant activity of ferulic acid (1), iso-ferulic acid (2), coniferyl aldehyde (3), methyl ferulate (4), and ethyl ferulate (5) were investigated using 2,2′-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) and ferric-reducing antioxidant power (FRAP) assays and autoxidation of triacylglycerols of commercially available sunflower oil (TGSO). The compounds tested for ability to scavenge ABTS radical cations was in the order of ferulic acid > coniferyl aldehyde ≈ iso-ferulic acid > ethyl ferulate ≈ methyl ferulate. The results of the FRAP assay for ferulic acid, iso-ferulic acid, and coniferyl aldehyde were similar to and higher than those of methyl ferulate and ethyl ferulate. In the lipid system, iso-ferulic acid showed weak antioxidant activity. The other ferulates exhibited much stronger, yet similar, activities.
Highlights
Phenolic acids and their derivatives have potential biological function
The results indicated differences between individual ferulates in term of their their structure
The ability of the tested compounds to scavenge ABTS radical cations was in the order of ferulic ferulic acid acid > coniferyl aldehyde ≈
Summary
Phenolic acids and their derivatives have potential biological function. They are widely spread throughout the plant kingdom and in foods of plant origin. The antioxidant properties of phenolic acids depends on their chemical structure. Cinnamic acid derivatives have been characterized as more potent than benzoic acid derivatives, due to the resonance stabilization enhanced by the conjugation between π electrons of the ring and the π bond of the side-chain [1]. The ortho-dixydroxyl substitution pattern is commonly regarded as important for the radical scavenging activities of phenolic acids [2,3]. The antiradical activity of phenolic acids is positively associated with methoxy groups no matter the substituent position [3]
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