Advances and applications of microwave spectroscopy are recommended, and the instrument structure... more Advances and applications of microwave spectroscopy are recommended, and the instrument structure and principle are also illuminated. Its applications in the analyses of molecular structure, conformation, weakly bound complexes, analytical chemistry, and interstellar media are reviewed. Future trends of microwave spectroscopy are discussed.
This is an original report proposed a CE method for direct analysis of the underivatized amino ac... more This is an original report proposed a CE method for direct analysis of the underivatized amino acids using UV detection with relatively higher sensitivity, which was based on coordination interactions between amino acids and Cu (II) ions. In addition, an online sweeping preconcentration technique was easily combined to improve the detection sensitivity. Satisfying separations of the amino acids were obtained under optimized conditions: 50 mmol/L CuSO4–0.05% HAc–H2O (pH 4.5), and the separation voltage of 15 kV. The LODs for the analytes ranged from 0.1 to 0.5 μmol/L. The linearity of detection for all analytes was two orders of magnitude with the correlation coefficients greater than 0.99. The repeatability was displayed with an RSD less than 3% for migration time and peak height (n = 5). Moreover, some amino acids in real samples of human saliva and green tea were analyzed by this direct UV detection CE method with acceptable sensitivity.
Advances and applications of microwave spectroscopy are recommended, and the instrument structure... more Advances and applications of microwave spectroscopy are recommended, and the instrument structure and principle are also illuminated. Its applications in the analyses of molecular structure, conformation, weakly bound complexes, analytical chemistry, and interstellar media are reviewed. Future trends of microwave spectroscopy are discussed.
This is an original report proposed a CE method for direct analysis of the underivatized amino ac... more This is an original report proposed a CE method for direct analysis of the underivatized amino acids using UV detection with relatively higher sensitivity, which was based on coordination interactions between amino acids and Cu (II) ions. In addition, an online sweeping preconcentration technique was easily combined to improve the detection sensitivity. Satisfying separations of the amino acids were obtained under optimized conditions: 50 mmol/L CuSO4–0.05% HAc–H2O (pH 4.5), and the separation voltage of 15 kV. The LODs for the analytes ranged from 0.1 to 0.5 μmol/L. The linearity of detection for all analytes was two orders of magnitude with the correlation coefficients greater than 0.99. The repeatability was displayed with an RSD less than 3% for migration time and peak height (n = 5). Moreover, some amino acids in real samples of human saliva and green tea were analyzed by this direct UV detection CE method with acceptable sensitivity.
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