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PHOTOCHEMICAL BEHAVIOUR OF A TRYPTOPHANYL ESTER OF RIBOFLAVIN A.M. Edwards and C. Bustos Pontificia Universidad Católica de Chile, Facultad de Química, Departamento Química Física. Casilla 306, Correo 22, Santiago-CHILE. E-mail: aedwards@puc.cl Abstract.- The photochemical behaviour of a tryptophanyl ester of riboflavin was studied. Both aerobic and anaerobic visible light (450nm) irradiation produced photodegradation of both flavinic and indolic components of the ester. The importance of a radical mechanism is discused.