8Furuta S, Suda I, Nishiba Y, Yamakawa O. 1998. High tert- butylperoxyl radical scavenging activity of sweet potato cul- tivars with purple flesh [ J ]. International Journal of Food Science and Technology, 4( 1 ) : 33-35.
9Huang Z L, Wang B W, Eaves Doris H, et al. Phenolic compound pro- file of selected vegetables frequently consumed by African Americans in the southeast United States [J]. Food Chemistry, 2007,103 ( 4 ) : 1395 - 1402.
