Abstract

The aim of present study A modified electrometric method was described and validated for measurement of cholinesterase (ChE) activity of plasma and tissues in normal wild bird (collared dove), for using the normal data of measured of ChE as comparison basis with data of ChE activity in bird which exposure to Organophosphorus and Crabmeats insecticide in wild environment. Replicate assay for the precision of the method produced a coefficient of variation 3.94 % in plasma and 4.59 % in the brain tissues. There was significant difference in plasma ChE activity by using acetylcholine iodide and acetylthiocholine iodide as substrates with no significant difference in bran. The maximum activity of ChE was in the plasma (0.82 ∆pH/30 min) whereas the minimum ChE activity in Pectorals muscle was (0.06 ∆pH / 30 min) when use acetylthiocholine iodide as substrates in the A modified electrometric method. Quinidine sulfate specifically inhibited pseudo ChE in the plasma, and it was estimated to be 25%, where as true ChE activity in the plasma was 75%. Dichlorvos at the concentration of (0.5, 1 μM/L) significantly inhibited plasma ChE in vitro by presenting 38%, 94%. These results indicate that the used of modified electrometric method its blind and subtle for measurement of ChE activities in (collared dove).