Highly efficient and simple reagent immobilisation procedure for an optrode membrane has been developed. The preparation procedure combines two well-known physical immobilisation procedures, viz. adsorption and encapsulation techniques, applied sequentially which, in turn, produce a combined optical sensing layer. The sensitive polymeric encapsulated membrane (PEM) contains the polymeric resin, which can adsorb a large amount of indicator dye, encapsulated within porous polymeric structure. The procedure has been tested in the preparation of a pH sensor.
Full text available here.