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Resveratrol has attracted interest as a wine constituent that may reduce heart disease. Published data on the molar absorptivity and chemical stability of cis- and trans-resveratrol have varied greatly. Accurate values for UV absorbance for trans-resveratrol UV λmax (EtOH) nm (ε) 308 (30 000) and cis-resveratrol UV λmax (EtOH) nm (ε) 288 (12 600) were determined and are used to improve chromatographic quantitation methods. Trials conducted under a variety of commonly encountered laboratory conditions show that trans-resveratrol is stable for months, except in high-pH buffers, when protected from light. cis-Resveratrol was stable only near pH neutrality when completely protected from light. Keywords: Antioxidant; phenolic; wine; grape; stilbene; isomer; UV spectroscopy; absorptivity
Trela et al. (Mon,) studied this question.
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