Molar absorptivity (e) and E(1%, 1 cm) values have been obtained at different pH of the medium containing vitamin B2 in the solution. s-values ranged from 12000-26000 when the measurement was made at 265 nm  at different pH. E(1%, 1 cm) values ranged from 323-710, increasing from lower to higher values as the pH of the medium was changed from 2.6-7.8. 


KARAMAT MAHMOOD ,MUNAWAR HUSSAIN ,M AMINUDDIN ,