Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1233069 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2009 | 5 Pages |
Abstract
Using 266Â nm laser flash photolysis it has been demonstrated that Berberine (BBR) in aqueous solution is ionized via a mono-photonic process giving a hydrated electron, anion radical that formed by hydrated electron react with steady state of BBR, and neutral radical that formed from rapid deprotonation of the radical cation of BBR. The quantum yield of photoionization is determined to be 0.03 at room temperature with KI solution used as a reference. Furthermore utilizing pH changing method and the SO4â radical oxidation method, the assignment of radical cation of BBR was further confirmed, the pKa value of it was calculated, and the related set up rate constant was also determined.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Ling-Li Cheng, Mei Wang, Hui Zhu, Kun Li, Rong-Rong Zhu, Xiao-Yu Sun, Si-De Yao, Qing-Sheng Wu, Shi-Long Wang,