Reaction of Paprika Carotenoids, Capsanthin and Capsorubin, with Reactive Oxygen Species

The reaction of paprika carotenoids, capsanthin and capsorubin, with reactive oxygen species (ROS), such as superoxide anion radical (center dot O-2(-)), hydroxyl radical (center dot OH), and singlet oxygen (O-1(2)), was analyzed by LC/PDA ESI-MS and ESR spectrometry. Capsanthin formed both the 5,6-epoxide and 5,8-epoxide by reaction with center dot O-2(-) and center dot OH. Furthermore, capsanthin also formed 5,6-and 5,8-endoperoxide on reaction with O-1(2). The same results were obtained in the case of capsanthin diacetate. On the other hand, capsorubin showed higher stability against these ROS. Capsorubin formed 7,8-epoxide on reaction with center dot O-2(-) and center dot OH and 7,8-endoperoxide on reaction with O-1(2).