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Determination of regional distributions of phenylethylamine andmeta-andpara-tyramine in rat brain regions and presence in human and dog plasma by an ultra-sensitive negative chemical ion gas chromatography-mass spectrometric (NCI-GC-MS) method

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Abstract

Using a new ultrasensitive method the trace biogenic amines, phenylethylamine,meta-tyramine andpara-tyramine have been quantitated in brain regions obtained from a single rat. Phenylethylamine concentrations in ng/g wet tissue (mean±std. error) were as follows: caudate 2.71±0.73, hypothalamus 0.45±0.15, cerebellum 0.09±0.02, olfactory bulb 0.35±0.11, stem 0.13±0.03, hippocampus 0.20±0.11, cortex 0.69±0.13 and the rest (remainder of the brain) 2.81±0.41. Mean whole brain was 1.23±0.19 ng/g, in agreement with previous measurements.meta-Tyramine concentrations (ng/g) were: caudate 2.69±0.19, hypothalamus 0.32±0.16, cerebellum 0.07±0.04, olfactory bulb 0.09±0.04, stem 0.04±0.01, hippocampus, 0.07±0.02, cortex 0.18±0.15 and the rest 0.15±0.06, with a mean whole brain value of 0.26±0.05 ng/g andpara-tyramine concentrations were: caudate 8.99±1.60, hypothalamus 0.93±0.13, cerebellum 0.78±0.27, olfactory bulb 0.70±0.13, stem 0.90±0.36, hippocampus 0.40±0.06, cortex 1.78±0.28 and the rest 2.38±0.12 and mean whole brain was 1.90±0.25 ng/g. In human plasma the concentrations of the three amines were found to be 31.3±3.4 pg/ml, 5.3±1.6 pg/ml and 66.0±9.9 pg/ml respectively and in dog blood 95.3±4.6 pg/ml, 24.0±7.6 pg/ml and 486±43 pg/ml respectively. When monoamine oxidase inhibitors were added to the blood immediately after collection there were no significant increases in the amine levels indicating that MAO-B is not present in plasma in significant quantities.

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  1. Neuropsychiatric Research Unit Department of Psychiatry, A114 Medical Research Building, University of Saskatchewan, S7N 0W0, Saskatoon, Saskatchewan, Canada

    D. A. Durden & B. A. Davis

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Durden, D.A., Davis, B.A. Determination of regional distributions of phenylethylamine andmeta-andpara-tyramine in rat brain regions and presence in human and dog plasma by an ultra-sensitive negative chemical ion gas chromatography-mass spectrometric (NCI-GC-MS) method. Neurochem Res 18, 995–1002 (1993). https://doi.org/10.1007/BF00966759

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