Enantioselective, potentiometric membrane electrodes based on maltodextrins.: Their applications for the determination of l-proline

The construction of enantioselective, potentiometric membrane electrodes (EPMEs) impregnated with the following maltodextrins having dextrose equivalence (DE) 4.0–7.0 (I), 13.0–17.0 (II) and 16.5–19.5 (III)—as chiral selectors is described. The response characteristics showed that the proposed electrodes could be reliably utilized in the assay of l-proline (l-Pro) as raw material, with the best enantioselectivity and time-stability exhibited when the EPME based on malodextrin I was used. The three EPMEs showed very low detection limits (of 10−9 mol/l magnitude order). The surfaces of the electrodes are easily renewable by simply polishing on an alumina paper.