In the primary reaction of hypocrellin A sensitized photooxidn., 1O2, O2. and H2O2 were formed, and the yield of O2. increased with the addition of a reducing substrate (such as 5-hydroxytryptophan, tryptophan, histidine, methionine and lysine). 1O2, O2. and H2O2 were resp. formed through energy transfer between triplet hypocrellin A and grout state O and the reduction of ground state O by hypocrellin A anions. Some free radicals were produced because of the weak H abstraction power of hypocrellin A, which promotes the interconversion of different forms of activated O species. Therefore, it was considered that both activated O species and free radicals were involved in the hypocrellin A sensitized photooxidn.

Key words: REACTION MECHANISM, ENERGY TRANSFER, PHOTOSENSITIZATION OXIDATION, HYPOCRELLA BAMBUSAE, SINGLE ELECTRON TRANSFER REACTION