Zeolite encapsulated Ni(II)-Schiff-base complex: A novel size-selective electro-catalyst for the determination of the purity of stevioside

► Synthesis of (NiII{salnptn(4-OH)2})/zeolite Y nano-composite. ► Fabrication of a modified electrode from this nanocomposite. ► Voltammetric determination of purity of stevioside by this modified electrode. ► Low cost, simple preparation, fast response, good stability. ► Good selectivity, wide linear range, applied detection limit, high reproducibility.