Abstract
Abstract The influence of hydroxycinnamic acids (HCA) on the oxy-radical generated system, potassium iodide/hydrogen peroxide, was investigated through the enhancement of triiodide (I3−) yield. Caffeic acid, chlorogenic acid, and p-coumaric acid were used as typical representatives of HCA. A linear correlation, with positive slopes, was found between absorption maximum of I3− at 351 nm and HCA concentration in all cases. The magnitude of enhanced I3− production was found to increase in the following order: p-coumaric acid < chlorogenic acid ≤ caffeic acid. A reaction mechanism, which includes negative influence of oxygen-centered free radicals on the I3− yield, was proposed. The enhanced production of I3− by HCA is attributed to their radical scavenging activity. Supported by literature data, results obtained in this study have showed the correlation between radical scavenging activities of HCA and their ability to enhanced I3− generation.
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