Simultaneous determination of serum concentrations of amoxicillin and clavulanate potassium in human blood using high-performance liquid chromatography / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish a chromatography-based method for simultaneous analysis of the concentrations of amoxicillin and clavulanate potassium in human blood.</p><p><b>METHODS</b>With paracetamol as the internal control, human plasma samples, after treatment with methanol for protein sedimentation and centrifugation, were loaded for analysis with high-performance liquid chromatography (HPLC). HPLC analysis was carried out using a C18 column (5 µm, 4.6 mm×150 mm) with the mobile phase of acetonitrile-PBS (0.05 mol/L) of 10:90 (pH 2.3), UV detection wavelength of 220 nm, flow rate of 1.0 ml/min, and column temperature of 25 degrees celsius;.</p><p><b>RESULTS</b>The retention time of acetaminophen for potassium clavulanate, amoxicillin sodium and the internal control was 5.3, 7.2, and 8.5 min, respectively, and no interference by the endogenous impurities in the plasma samples was found. Amoxicillin sodium showed a good linearity within the concentration range of 0.52-4.16 µg/ml (r(2)=0.9996), and potassium clavulanate had a good linearity within the range of 0.266-2.14 µg/ml (r(2)=0.9998). The minimum detectable concentrations of amoxicillin sodium and potassium clavulanate were 0.065 µg/ml and 0.066 µg/ml, respectively. The relative recoveries of amoxicillin sodium were 95.9%-96.5% (n=5), and those of clavulanate potassium were 92.5%-98.8% (n=5); the intra- and inter-day RSD of amoxicillin sodium was 1.84%-6.4% and 2.1%-7.8%, as compared to that of potassium clavulanate of 3.57%-8.6% and 1.8%-9.1%, respectively.</p><p><b>CONCLUSION</b>This method is simple, accurate, sensitive, specific and reproducible for analyzing the concentrations of amoxicillin and clavulanate potassium simultaneously in human plasma.</p>

Differentiation of Candida Species by PCR-SSCP Fingerprinting Analysis / 微生物学通报

Thirty strains of seven Candida species from CICC(China Center of Industrial Culture Collection)were studied. The strains were differentiated by ITS1 region PCR-SSCP fingerprinting analysis and ITS2 region PCR-SSCP fingerprinting analysis. Results showed that both ITS1 region and ITS2 region were able to differentiate the seven species of Candida clearly. Contrasting the maps and effects on the identification of Candida species of ITS1 region with that of ITS2 region, result indicated that on the identification of Candida species the application of ITS2 region was better than ITS1 region.