Characterization of the transient species generated by the photoionization of Berberine: A laser flash photolysis study

Using 266 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 deprotona...

Full description

Saved in:
Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2009-09, Vol.73 (5), p.955-959
Main Authors: Cheng, Ling-Li, Wang, Mei, Zhu, Hui, Li, Kun, Zhu, Rong-Rong, Sun, Xiao-Yu, Yao, Si-De, Wu, Qing-Sheng, Wang, Shi-Long
Format: Article
Language:English
Subjects:
Berberine
Laser flash photolysis
Mono-photonic ionization
Radicals
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using 266 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 SO 4 − radical oxidation method, the assignment of radical cation of BBR was further confirmed, the p K a value of it was calculated, and the related set up rate constant was also determined.
ISSN:1386-1425
DOI:10.1016/j.saa.2009.05.001