Abstract
In most bioluminescent processes, a fluorescent molecule is generated in the excited singlet state as a result of an enzymatic reaction. This species then relaxes to the ground state with emission of light. Work carried out in this and associated laboratories during the last decade has shown that triplet (carbonyl) species can also be generated enzymatically. Since triplet species have much longer intrinsic lifetimes than singlet species, they are potentially of importance in biological systems. The aim of this paper is to provide pertinent, detailed information regarding one of the most striking and widely investigated enzymatic systems which gives rise to an elec- tronically excited product in its triplet state. Students should find this unique system intriguing and interested investigators may find it worthwhile to consider using this system to replace light in order to accomplish certain photochemical and photobiological transformations. The enzymatic generation and transfer of triplet energy is an entirely new field, which opens the way for understanding the biological occurrence of photochemical-like phenomena in the absence of light. 1
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