Antioxidant activity of a new capsaicin derivative from capsicum annuum

A new capsaicin derivative, 6,7-dihydro-5',5'-dicapsaicin (1), and a known capsaicin metabolite, (omega)-hydroxycapsaicin (2),(1) were isolated from the fruit of Capsicum annuum. Their structures were established on the basis of spectroscopic evidence. Compound 1 showed almost the same antioxidant activity as capsaicin, but did not have a pungent taste.