title: Platinum particles-modified electrode for HPLC with pulsed amperometric detection of thiols in rat striatum.
abstract: A new chemically modified electrode based on the immobilization of Pt particles is fabricated and exhibits electrocatalytic oxidation for L-cysteine (L-Cys), glutathione (GSH) and penicillamine (PEN) with relatively high sensitivity. It is also adaptable to HPLC for pulsed amperometric detection (PAD) of these thiols. PAD largely improves the detection sensitivity because the alternated polarizations can effectively clean and reactivate the electrode surface. It is shown that the peak currents of L-Cys, GSH and PEN are linear to their concentrations, with the calculated detection limit of 1.1 x 10(-7), 1.8 x 10(-7) and 3.8 x 10(-7) mol L(-1), respectively (S/N = 3). The method has been successfully applied to assess the contents of L-Cys and GSH in rat striatal microdialysates. The average contents of the two analytes in rat striatum are 2.6 x 10(-6) and 2.8 x 10(-6) mol L(-1), respectively.
authors.affiliation: Department of Chemistry, East China Normal University, Shanghai 200062, People's Republic of China.
authors.forename: Xu-Ni
authors.initials: XN
authors.lastname: Cao
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Li
authors.forename: Hai-Hong
authors.initials: HH
authors.lastname: Xu
authors.forename: Li
authors.initials: L
authors.lastname: Lin
authors.forename: Yue-Zhong
authors.initials: YZ
authors.lastname: Xian
authors.forename: Katsunobu
authors.initials: K
authors.lastname: Yamamoto
authors.forename: Li-Tong
authors.initials: LT
authors.lastname: Jin
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003342:Corpus Striatum / Q000737:chemistry*; D003545:Cysteine / Q000032:analysis; D004563:Electrochemistry; D004566:Electrodes; D005978:Glutathione / Q000032:analysis; D010084:Oxidation-Reduction; D010396:Penicillamine / Q000032:analysis; D010984:Platinum; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013438:Sulfhydryl Compounds / Q000032:analysis*; D013997:Time Factors
chemical_list: D013438:Sulfhydryl Compounds; D010984:Platinum; D005978:Glutathione; D010396:Penicillamine; D003545:Cysteine