The testa or skins of peanuts are known sources of phenolic compounds and are currently used at low levels in animal feeds or discarded. In the United States, almost a million tons are produced annually. In this study, peanut skins were extracted with 70% ethanol solutions to concentrate small molecular weight polar materials. Ethanol was removed and the remained water slurry was spray dried with and without maltodextrin as a flow agent. The resulting powders were found to have total phenolic contents in excess of 800 mg/g of gallic acid equivalents and H-ORAC values higher than 4000 �moles Trolox/g on a dry weight basis. These extracts were also found to decrease the inflammatory response of Raw 264.7 cells when challenged by LPS as determined by the decrease in PGE2 produced over the control. Western blotting indicated that a decrease in COX-2 expression was the mechanism of response.

Bioactivity of spray dried powders prepared from solvent extracts of peanut skins

243rd National Meeting (2012)

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