octahydrate (ZrOCl2·8H2O, ≥99.5%),
methylene blue (C16H18ClN3S.XH2O), β-cyclodextrin, dopamine hydrochloride, and TMB
were purchased from Sigma-Aldrich. H2O2 (30
wt %), 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide
(MTT), and 2′,7′-dichlorofluorescin diacetate (DCFH-DA)
were purchased from Alfa-Asser. Fresh neem leaves were collected from
the University of North Bengal Campus. All the chemicals are used
in this work were analytical graded and used without further purification.