Abstract
Abstract– The time course for accumulation of acetylcholine was measured in rat brain regions after treatment with 15 mg/kg, i.v., dichlorvos. With this dose of dichlorvos 84‐96% of the brain cholinester‐ase is inhibited within 1 min. After killing and concomitant enzyme inactivation through microwave irradiation, the acetylcholine levels were measured by pyrolysis‐gas chromatography. In the brain regions studied, the striatum had the highest rate of accumulation of acetylcholine and the cerebellum had the lowest. The calculated turnover time in minutes for the regions of the brain were cerebral cortex 0.9; hippocampus 1; striatum 1.4; cerebellum 1.7; medulla‐pons 2.2; midbrain 4.5; thalamus 5.6.
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