Journal Articles

Phytochemical Changes in Phenolics, Anthocyanins, Ascorbic Acid, and Carotenoids Associated with Sweetpotato Storage and Impacts on Bioactive Properties.

September 05, 2013

Phytochemical Changes in Phenolics, Anthocyanins, Ascorbic Acid, and Carotenoids Associated with Sweetpotato Storage and Impacts on Bioactive Properties. Food Chemistry. E-Pub September 5, 2013. Mary H. Grace , Gad Yousef, Sally J. Gustafson, Van-Den Truong, G. Craig Yencho , Mary Ann Lila.

Plants for Human Health Institute, Department of Food, Bioprocessing and Nutrition Sciences, North Carolina State University, NC Research Campus; USDA-ARS, SAA Food Science Research Unit, Department of Food, Bioprocessing, and Nutrition Sciences, North Carolina State University, Raleigh, NC; Department of Horticultural Science, North Carolina State University, Raleigh, NC 27695.

Abstract

Sweetpotato phytochemical content was evaluated in four genotypes (NCPUR06-020, Covington, Yellow Covington, and NC07-847) at harvest and after curing/storage for 4 or 8 months. Curing and storage for up to 8 months did not significantly affect total phenolic content in Covington, Yellow Covington, and NC07-847, however for NCPUR06-020, a purple-fleshed selection, total phenolic content declined mainly due to anthocyanin degradation during storage. Covington had the highest carotenoid content at harvest time (281.9 μg/g DM), followed by NC07-847 (26.2 μg/g DM), and after 8 months, total carotenoids had increased by 25% and 50%, respectively. Antioxidant activity gradually declined during storage, and freshly harvested sweetpotatoes also demonstrated higher anti-inflammatory capacity as gauged by inhibition of lipopolysaccharide-induced reactive oxygen species (ROS) in SH-SY5Y cells. Gradual changes in sweetpotato phytochemical content and antioxidant and anti-inflammatory capacity were noted during normal long-term storage, but the specific effects were genotype-dependent.

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