Formation of CD hydroperoxides in the incubation medium of Caco-2 Cells with DHA (30 μmol/L) and GSE (45.8 ppm that contained 47 μmol/L catechin, 46 μmol/L epicatechin, 23 μmol/L EGCG, and 6 μmol/L procyanidin B2) for 2 or 6 h. Results are mean ± SD, n = 3. *Different from DHA+GSE at that time, P < 0.05. CD, conjugated diene; EGCG, epigallocatechin gallate; GSE, grape seed extract.