ION-EXCHANGER MODIFIED PVC MEMBRANES SELECTIVITY STUDIES AND RESPONSEAMPLIFICATION OF OXALATE AND LACTATE ENZYME ELECTRODES

We report on a novel method of oxidase enzyme electrode response ampli fication, using unplasticized PVC and plasticized PVC, respectively. T he anion exchanger tricaprylylmethylammonium chloride (Aliquat 336s) a nd hydrophobic isopropylmyristate (IPM) plasticizer have been used tog ether to modify PVC. Resulting structures are anionic substrate select ive and hydrogen peroxide impermeable and can be used as outer membran es of a classical dual membrane amperometric enzyme electrode where an oxidase is used to generate H2O2 for electrochemical detection. Their effect on sensor sensitivity and linearity is considered. (C) 1997 El sevier Science.