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Quantitative and Qualitative Changes in the Skeletal Muscle Acetylcholinesterase Activity of Oreochromis niloticus Exposed to Methylparathion

Author(s): Elena Catap | Glorina Pocsidio

Journal: Science Diliman
ISSN 0115-7809

Volume: 6;
Start page: 56;
Date: 1994;
Original page

Keywords: acetylcholinesterase | oreochromis niloticus | methylparathion

Spectrophotometric assays and histochemical tests for acetylcholinesterase activity in the epaxial skeletal muscle of maturing Oreochromis niloticus after in-vivo exposure to 0.10 mg/L methylparathion showed significant inhibition of the enzyme by the pesticide. The assays manifested enzyme inhibition, after 48 and 96 hours of exposure, of 43.19% and 56.62%, respectively. These results were confirmed by the occurrences of decreased sites of acetylcholinesterase activity in the muscle fibers as exhibited upon performance of histochemical tests.
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