Laser photolysis and pulse radiolysis studies on Silybin in ethanol solutions

Fu, H.*; Katsumura, Yosuke; Lin, M.; Muroya, Yusa*

In the present work, laser photolysis techniques have been used to study the transient species of silybin (abbreviated as SLB) in ethanol solutions. It has been demonstrated that the exposure of silybin to 248 nm excimer laser gives rise to monophotonic ionization with a high quantum yield. The transient species have been identified, and a series of related kinetics parameters have also been obtained. For the sake of comparison, we approached the problem using another way to reduce silybin, i.e. attack of solvated electrons, e, produced in pulse radiolysis. The rate constant for reaction of e was determined to be 3.810 dmmols at 720 nm, which is consistent with 4.610 dmmols, obtained by laser photolysis.