Laser photolysis and pulse radiolysis studies on silybin in ethanol solutions

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, esol−, produced in pulse radiolysis. The rate constant for reaction of esol− was determined to be 3.8×109 dm3 mol−1 s−1 at 720 nm, which is consistent with 4.6×109 dm3 mol−1 s−1, obtained by laser photolysis.