Jun Ueyama1, Yusuke Ishikawa2, Takaaki Kondo3, Megumi Motoyama3, Hiroyuki Matsumoto2, Tadashi Matsushita4. 1. Department of Pathophysiological Laboratory Sciences, Field of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan ueyama@met.nagoya-u.ac.jp. 2. Department of Medical Technique, Nagoya University Hospital, Nagoya, Japan. 3. Department of Pathophysiological Laboratory Sciences, Field of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, Nagoya, Japan. 4. Department of Transfusion Medicine, Nagoya University Hospital, Nagoya, Japan.
Abstract
BACKGROUND: Previously, high-performance liquid chromatography (HPLC) equipped with ultraviolet or fluorescence detectors has been used for separation of human mercaptalbumin (HMA) and human non-mercaptalbumin (HNA). However, it is difficult to perform reliable chromatographic analysis due to peak interference of such serum compounds as uric acid and bilirubin. The aim of this study is to explore a selective and simple analytical method for the determination of HMA and HNA. METHOD: HMA and HNA in serum sample were separated by HPLC and reacted with bromocresol green using a postcolumn reaction scheme. RESULTS: A complete separation of HMA and HNA is achieved in less than 30 min by using weak anion exchange columns and isocratic elution. Within-run and between-day precisions at albumin concentration of 45 g/L were 4.2 and 1.7% for HMA and 4.5 and 4.6% for HNA, respectively. There was no interference in HMA and HNA peaks when bilirubin-, haemoglobin- or chyle-spiked pooled serum samples were analysed. CONCLUSION: Our method is reliable and not labour-intensive and, therefore, might be applicable for clinical and epidemiological studies.
BACKGROUND: Previously, high-performance liquid chromatography (HPLC) equipped with ultraviolet or fluorescence detectors has been used for separation of human mercaptalbumin (HMA) and human non-mercaptalbumin (HNA). However, it is difficult to perform reliable chromatographic analysis due to peak interference of such serum compounds as uric acid and bilirubin. The aim of this study is to explore a selective and simple analytical method for the determination of HMA and HNA. METHOD:HMA and HNA in serum sample were separated by HPLC and reacted with bromocresol green using a postcolumn reaction scheme. RESULTS: A complete separation of HMA and HNA is achieved in less than 30 min by using weak anion exchange columns and isocratic elution. Within-run and between-day precisions at albumin concentration of 45 g/L were 4.2 and 1.7% for HMA and 4.5 and 4.6% for HNA, respectively. There was no interference in HMA and HNA peaks when bilirubin-, haemoglobin- or chyle-spiked pooled serum samples were analysed. CONCLUSION: Our method is reliable and not labour-intensive and, therefore, might be applicable for clinical and epidemiological studies.