Abstract:
In this work, nanocrystalline titanosilicate and ZSM-5 were synthesized in the presence of propyltriethoxy silane as an additive. Electrochemical biosensors based on nanocrystalline zeolites were fabricated through the covalent immobilization of
the enzyme acetylcholinesterase for the ultra-trace detection
of toxic organophosphate pesticides such as malathion, parathion methyl, monocrotopos, and dichlorvos. The results show
that, among the zeolite-based biosensors investigated in this
study, the nanocrystalline titanosilicate-based acetylcholinesterase biosensor exhibited the highest electrocatalytic activity.
The nanocrystalline titanosilicate-based acetylcholinesterase
biosensor exhibited excellent sensitivity, selectivity, stability,
linear range, and limit of detection. The analytical performance
of the developed sensor was demonstrated in the determination of these pesticides in a range of real samples (apples, cabbages, tap water, and river water) with satisfactory recovery
