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This study was designed to investigate the effects of molluscicidal components of  Myristica fragrans  Houtt. (Myristicaceae) on certain enzymes in the nervous tissue of freshwater snail  Lymnaea acuminata  Lamarck (Lymnaeidae).  In vivo  and  in vitro  treatments of trimyristin and myristicin (active molluscicidal components of  Myristica fragrans  Houtt.) significantly inhibited the acetylcholinesterase (AChE), acid and alkaline phosphatase (ACP/ALP) activities in the nervous tissue of  Lymnaea acuminata . The inhibition kinetics of these enzymes indicates that both the trimyristin and myristicin caused competitive noncompetitive inhibition of AChE. Trimyristin caused uncompetitive and competitive/noncompetitive inhibitions of ACP and ALP, respectively whereas the myristicin caused competitive and uncompetitive inhibition of ACP and ALP, respectively. Thus results from the present study suggest that inhibition of AChE, ACP, and ALP by trimyristin and myristicin in the snail  Lymnaea acuminata  may be the cause of the molluscicidal activity of  Myristica fragrans .

Enzyme Inhibition by Molluscicidal Components ofMyristica fragransHoutt. in the Nervous Tissue of SnailLymnaea acuminata