Sweet potato peel is a waste product generated during post-harvest processing. However, it contains a variety of antioxidant phenolics. In our study, the profile of phenolics in the peel of the sweet potato harvested in Louisiana was investigated. Also, the antioxidant activity of the peel extract was evaluated using a cholesterol emulsion model at 37 �C. Chlorogenic acid was a dominant phenolic in the peel extract. Three different levels of the extract were applied to the oxidation model. The leading oxidation product 7 -ketocholesterol was determined by a HPLC method. Compared with the control group, the oxidation inhibition rates of the model mixed with 500, 100, and 20 �g/g of the extract were 100, 83, and 48 % after 48 hours, respectively. The results indicated the phenolics in sweet potato peel have significant activity in inhibiting cholesterol oxidation and may possess the health benefit of preventing cholesterol associated chronic diseases.

Phenolics in sweet potato peel inhibit cholesterol oxidation

245th National Meeting (2013)

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