A CE-LIF method based on long wavelength fluorescence labeling for the analysis of thiols in human urine.
A rapid and robust CE method using a long wavelength fluorescent reagent 1,7-dimethyl-3,5-distyryl-8-phenyl-(2-maleimide)difluoroboradiaza-s-indacene as the labeling reagent has been developed for the simultaneous determination of thiols, including glutathione, cysteine, homocysteine, N-acetylcysteine, cysteinylglycine, and penicillamine. The derivatization reaction was carried out in 14 mmol/L pH 8.5 borate buffer at 30°C for 6 min and the labeled thiols derivatives were separated with the running buffer containing 30 mmol/L pH 7.4 phosphate, 30% v/v acetonitrile and 8 mmol/L SDS within 12 min. Detection limits ranged from 0.4 to 2.4 nmol/L. To demonstrate the capability of this method, it was applied to the analysis of thiols in human urine with recoveries of 92.4-105.6%. The derivatization reaction was much faster at milder conditions, and the analysis was rapider. Moreover, with excitation wavelength at long wavelength region, background interference from samples was reduced effectively. The present method seems to be a potential choice for quantifying thiols in human urine.
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China.|Suzhou Institute of Wuhan University, Suzhou, P. R. China.
Ya-Jun
YJ
Duan
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China.
Li-Yun
LY
Zhang
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China.|Suzhou Institute of Wuhan University, Suzhou, P. R. China.
Xiao-Feng
XF
Guo
Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, P. R. China.
Hong
H
Wang
D019075:Electrophoresis, Capillary / Q000379:methods*; D005456:Fluorescent Dyes / Q000737:chemistry*; D006801:Humans; D057230:Limit of Detection; D016014:Linear Models; D013438:Sulfhydryl Compounds / Q000652:urine*
D005456:Fluorescent Dyes; D013438:Sulfhydryl Compounds
1,7-Dimethyl-3,5-distyryl-8-phenyl-(2-maleimide)difluoroboradi-aza-s-indacene; Capillary electrophoresis; LIF; Long wavelength; Thiols