Determination of ascorbic acid in individual rat hepatocyte by capillary electrophoresis with electrochemical detection.
A method for the direct determination of ascorbic acid (AA) in individual rat hepatocyte based on capillary electrophoresis (CE) coupled with electrochemical detection (ECD) using a new kind of homemade carbon fiber micro-disk bundle electrode has been described. Individual rat hepatocytes were injected into a fused-silica capillary with an inner diameter of 25 microm, and lysed by 0.1% sodium dodecylsulfate (SDS) as cell lysis solution. The following conditions were suitable for the determination of AA: running buffer, 1.83 x 10(-2) mol/l Na2HPO4-1.70 x 10(-3) mol/l NaH2PO4 (pH 7.8); separation voltage, 20.0 kV; detection potential, 0.80 V (vs. saturated calomel electrode (SCE)). The concentration limit of detection (LOD) of the method was 1.7 x 10(-6) mol/l at a signal-to-noise (S/N) ratio of 3, and the mass LOD was 3.0 fmol. The linear dynamic range was from 5.0 x 10(-6) to 5.0 x 10(-4) mol/l with a correlation coefficient of 0.9962 for the injection voltage of 5.0 kV and injection time of 10s. The relative standard deviation (R.S.D.) was 0.85% for the migration time and 1.8% for the peak current. This method was successfully applied to AA determination in rat hepatocyte. The recovery was between 91% and 97%, and the amount of AA in single rat hepatocyte ranged from 28 to 63 fmol.
Sun
Xuemei
X
Key Laboratory of Eco-chemical Engineering, Ministry of Education, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
Niu
Yan
Y
Bi
Sai
S
Zhang
Shusheng
S
D000818:Animals; D001205:Ascorbic Acid / Q000032:analysis*; D004563:Electrochemistry / Q000379:methods*; D019075:Electrophoresis, Capillary / Q000379:methods*; D022781:Hepatocytes / Q000737:chemistry* / Q000378:metabolism; D008297:Male; D051381:Rats
D001205:Ascorbic Acid