The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform
Peng Gao - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of catecholamines and their metabolites in adrenal gland by liquid chromatography tandem mass spectrometry
Analytica chimica acta, 2008Co-Authors: Xianzhe Shi, Peiyuan Yin, Peng GaoAbstract:Abstract Two simple, rapid and specific analytical methods for 13 catecholamines and their metabolites have been developed based on liquid chromatography tandem mass spectrometry in a multiple reaction monitoring mode. Tyrosine, dopamine, dihydroxyphenylalanine, epinephrine, norepinephrine, 3-methoxytyramine, normetanephrine, metanephrine and isoproterenol (internal standard) were separated on a Kromasil™ Cyano analytical column by a mobile phase consisting of 60% (v/v) acetonitrile and 40% (v/v) water adjusted with formic Acid to pH 3.0, and detected by positive ionization electrospray tandem mass spectrometry. While vanillymandelic Acid, 3,4-dihydroxymandelic Acid, homovanillic Acid, 3,4-dihydroxyphenylacetic Acid, 4-hydroxy-3-methoxyphenylglycol and 5-hydroxy-2-Indolecarboxylic Acid (internal standard) were separated on a reversed-phase Shim-Pak VP-ODS column with the mobile phase of 60% (v/v) acetonitrile, and 40% (v/v) water adjusted with formic Acid to pH 4.5 and detected in the negative ionization electrospray tandem mass spectrometry. The influence of various parameters such as column type and mobile phase composition on separation and sensitivity were investigated. The limits of detection were in the range of 0.5–20 ng mL−1. The mean recoveries determined from three different concentrations of each analyte were above 85.4%. The precision of the method calculated as relative standard deviation was lower than 5.3%. Deduced from the results of real sample analysis, adrenal gland synthesizes and stores the catecholamine hormones norepinephrine and epinephrine.
Xianzhe Shi - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of catecholamines and their metabolites in adrenal gland by liquid chromatography tandem mass spectrometry
Analytica chimica acta, 2008Co-Authors: Xianzhe Shi, Peiyuan Yin, Peng GaoAbstract:Abstract Two simple, rapid and specific analytical methods for 13 catecholamines and their metabolites have been developed based on liquid chromatography tandem mass spectrometry in a multiple reaction monitoring mode. Tyrosine, dopamine, dihydroxyphenylalanine, epinephrine, norepinephrine, 3-methoxytyramine, normetanephrine, metanephrine and isoproterenol (internal standard) were separated on a Kromasil™ Cyano analytical column by a mobile phase consisting of 60% (v/v) acetonitrile and 40% (v/v) water adjusted with formic Acid to pH 3.0, and detected by positive ionization electrospray tandem mass spectrometry. While vanillymandelic Acid, 3,4-dihydroxymandelic Acid, homovanillic Acid, 3,4-dihydroxyphenylacetic Acid, 4-hydroxy-3-methoxyphenylglycol and 5-hydroxy-2-Indolecarboxylic Acid (internal standard) were separated on a reversed-phase Shim-Pak VP-ODS column with the mobile phase of 60% (v/v) acetonitrile, and 40% (v/v) water adjusted with formic Acid to pH 4.5 and detected in the negative ionization electrospray tandem mass spectrometry. The influence of various parameters such as column type and mobile phase composition on separation and sensitivity were investigated. The limits of detection were in the range of 0.5–20 ng mL−1. The mean recoveries determined from three different concentrations of each analyte were above 85.4%. The precision of the method calculated as relative standard deviation was lower than 5.3%. Deduced from the results of real sample analysis, adrenal gland synthesizes and stores the catecholamine hormones norepinephrine and epinephrine.
Jean-jacques Aaron - One of the best experts on this subject based on the ideXlab platform.
-
Infrared study of Indolecarboxylic Acids associations with lanthanide acetates
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1998Co-Authors: Alphonse Tine, Philippe Guillaume, A. Massat, Jean-jacques AaronAbstract:Abstract IR spectra of three indole-carboxylic Acids, including 2-Indolecarboxylic Acid, 5-Indolecarboxylic Acid and 3-indoleacetic Acid have been investigated in their crystalline form (KBr pellets) and in DMSO solution, in the presence and the absence of lanthanide (Dy3+, Er3+, Eu3+, Nd3+ and Yb3+) acetates. This study demonstrates that complexes are formed between indole carboxylates and Ln3+ ions, providing evidence for proton transfer processes between Indolecarboxylic Acids and lanthanide acetate ions. Monodentate and bidentate structures are proposed for these complexes.
Peiyuan Yin - One of the best experts on this subject based on the ideXlab platform.
-
Analysis of catecholamines and their metabolites in adrenal gland by liquid chromatography tandem mass spectrometry
Analytica chimica acta, 2008Co-Authors: Xianzhe Shi, Peiyuan Yin, Peng GaoAbstract:Abstract Two simple, rapid and specific analytical methods for 13 catecholamines and their metabolites have been developed based on liquid chromatography tandem mass spectrometry in a multiple reaction monitoring mode. Tyrosine, dopamine, dihydroxyphenylalanine, epinephrine, norepinephrine, 3-methoxytyramine, normetanephrine, metanephrine and isoproterenol (internal standard) were separated on a Kromasil™ Cyano analytical column by a mobile phase consisting of 60% (v/v) acetonitrile and 40% (v/v) water adjusted with formic Acid to pH 3.0, and detected by positive ionization electrospray tandem mass spectrometry. While vanillymandelic Acid, 3,4-dihydroxymandelic Acid, homovanillic Acid, 3,4-dihydroxyphenylacetic Acid, 4-hydroxy-3-methoxyphenylglycol and 5-hydroxy-2-Indolecarboxylic Acid (internal standard) were separated on a reversed-phase Shim-Pak VP-ODS column with the mobile phase of 60% (v/v) acetonitrile, and 40% (v/v) water adjusted with formic Acid to pH 4.5 and detected in the negative ionization electrospray tandem mass spectrometry. The influence of various parameters such as column type and mobile phase composition on separation and sensitivity were investigated. The limits of detection were in the range of 0.5–20 ng mL−1. The mean recoveries determined from three different concentrations of each analyte were above 85.4%. The precision of the method calculated as relative standard deviation was lower than 5.3%. Deduced from the results of real sample analysis, adrenal gland synthesizes and stores the catecholamine hormones norepinephrine and epinephrine.
Alphonse Tine - One of the best experts on this subject based on the ideXlab platform.
-
Infrared study of Indolecarboxylic Acids associations with lanthanide acetates
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 1998Co-Authors: Alphonse Tine, Philippe Guillaume, A. Massat, Jean-jacques AaronAbstract:Abstract IR spectra of three indole-carboxylic Acids, including 2-Indolecarboxylic Acid, 5-Indolecarboxylic Acid and 3-indoleacetic Acid have been investigated in their crystalline form (KBr pellets) and in DMSO solution, in the presence and the absence of lanthanide (Dy3+, Er3+, Eu3+, Nd3+ and Yb3+) acetates. This study demonstrates that complexes are formed between indole carboxylates and Ln3+ ions, providing evidence for proton transfer processes between Indolecarboxylic Acids and lanthanide acetate ions. Monodentate and bidentate structures are proposed for these complexes.
