Xu Guowang

The application of spline wavelet transform to the determination of electroosmotic mobility in capillary electrophoresis.

The rule of current change was studied during capillary electrophoresis (CE) separation process while the conductivity of the sample solution was different from that of the buffer. Using a quadratic spline wavelet of compact support, the wavelet transforms (WTs) of capillary electrophoretic currents were performed. The time corresponding to the maximum of WT coefficients was chosen as the time of current inflection to calculate electroosmotic mobility. The proposed method was suitable for different CE modes, including capillary zone electrophoresis, nonaqueous CE and micellar electrokinetic chromatography. Compared with the neutral marker method, the relative errors of the developed method for the determination of electroosmotic mobility were all below 2.5%.

Study on the Nature of Spleen Qi Deficiency Based on Metabonomics

This study aimed at analyzing small molecule metabolites c in plasma in order to find the spectra of plasma in metabolic syndromes (MS) of spleen qi deficiency, which is different from other kinds of deficiency. The basic documents related to subjects were collected in combination with the diagnostic criteria of metabolic syndrome and spleen qi deficiency. UPLC-Q-TOF-MS was used in the separation of plasma metabolites. The results showed that the spectrum of plasma in MS of the spleen qi deficiency is different from healthy subjects in metabonomics (P < 0.05). It is concluded that three compounds are possibly the latent markers of MS; another three compounds may be the potential markers of the spleen qi deficiency.

Capillary electrophoretic study on UDP-sugars in cells

Glucose is an important regulator of cell growth and metabolism. Uridine diphosphate sugars (UDP-sugars), as the intermediate products of metabolism, play pivotal roles as precursors in the synthesis of complex carbohydrates and glycolipids as well as lectose. It is very important to study their metabolism in cells in clinical biochemistry. A capillary electrophoretic method has been developed for the analysis of UDP-sugars and nucleotides. By using an uncoated capillary (70cm × 50 μm) and 20 mmol/L borax buffer (pH 9), 4 important UDP-sugars can be analyzed in 15 min at 22 kV with satisfactory precision and sensitivity. The developed method has been applied to analyze UDP-sugars concentrations in lymphocytes, fibroblasts and mesangial cells, and the results show it not only is much better than HPLC method, but also can be used to measure the energy charge of cells.