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G Nakagawa

Publications and source records attributed to G Nakagawa.

4 recordsLinked to original sources
PubMed1992

Reversed-phase high-performance liquid chromatography of several metal-8-quinolinethiol complexes.

The reversed-phase high-performance liquid chromatography of 8-quinolinethiol (Hqt) complexes of Fe, Co, Ni, Cu, Zn, Hg and Pb on an octadecyl-bonded silica gel stationary phase was examined. The Pb complex dissociated in the column. The retention and separation of other complexes depended on the composition of the mobile phase. EDTA as an additive displaced the Zn complex and eliminated its peak. All the other metal complexes and also Hqt and its disulphide were separated in 23 min by using methanol-water (82:18, v/v) as the mobile phase. The complexes formed by the reaction of Co(II) and Hqt gave three peaks, which were assigned as fac(S)-CoIII(qt)3, mer(S)-CoIII(qt)3 and CoII(qt)2, respectively. This method is applicable to the simultaneous determination of Fe, Co, Ni, Cu and Hg.

Chromatography, High Pressure Liquid↗
PubMedDate not supplied

Separation of nucleotides by high-voltage capillary electrophoresis.

A new separation method using high-voltage capillary electrophoresis was applied to the analysis of several nucleotides. This system consisted of a micro-bore glass capillary column of 80-micron i.d., a high-voltage power supply, and a uv detector set at 254 nm. Seven nucleotides (cyclic AMP, AMP, ADP, ATP, GMP, GDP, and GTP) were separated completely from each other in 0.02 M phosphate buffer (pH 7) containing 0.5% ethylene glycol by applying about 150 V/cm. The theoretical plate number for AMP was nearly 45,000. A good separation of nucleotides in biological samples of rat blood, liver, and kidney was attained under the same conditions as above. Concentrations of nucleotides in these biological samples were measured by using pyridoxamine as an internal standard.

Animals↗