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- W2772047801 abstract "Abstract A method is described for the analysis of amino acids, monoamines and metabolites by high-performance liquid chromatography with electrochemical detection (HPLC–ED) from individual brain areas. The chromatographic separations were achieved using microbore columns. For amino acids we used a 100×1 mm I.D. C 8 , 5 μm column. A binary mobile phases was used: mobile phase A consisted of 0.1 M sodium acetate buffer (pH 6.8)–methanol–dimethylacetamide (69:24:7, v/v) and mobile phase B consisted of sodium acetate buffer (pH 6.8)–methanol–dimethylacetamide (15:45:40, v/v). The flow-rate was maintained at 150 μl/min. For monoamines and metabolites we used a 150×1 mm I.D. C 1 8 5 μm reversed-phase column. The mobile phase consisted of 25 m M monobasic sodium phosphate, 50 m M sodium citrate, 27 μ M disodium EDTA, 10 m M diethylamine, 2.2 m M octane sulfonic acid and 10 m M sodium chloride with 3% methanol and 2.2% dimethylacetamide. The potential was +700 mV versus Ag/AgCl reference electrode for both the amino acids and the biogenic amines and metabolites. Ten rat brain regions, including various cortical areas, the cerebellum, hippocampus, substantia nigra, red nucleus and locus coeruleus were microdissected or micropunched from frozen 300-μm tissue slices. Tissue samples were homogenized in 50 or 100 μl of 0.05 M perchloric acid. The precise handling and processing of the tissue samples and tissue homogenates are described in detail, since care must be exercised in processing such small volumes while preventing sample degradation. An aliquot of the sample was derivatized to form the tert .-butylthiol derivatives of the amino acids and γ-aminobutyric acid. A second aliquot of the same sample was used for monamine and metabolite analyses. The results indicate that the procedure is ideal for processing and analyzing small tissue samples." @default.
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- W2772047801 date "1998-06-13" @default.
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- W2772047801 title "Procedure for the sample preparation and handling for the determination of amino acids, monoamines and metabolites from microdissected brain regions of the rat" @default.
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