MTT (3-[4,5-dimethylthiazol]-2.5 diphenylterazolium bromide assay; Thiazole Blue Tetrazolium, M2128, Sigma Aldrich, Missouri, United States); phosphate buffer saline (PBS; Bioenno Tech, California, United States); dimethyl sulfoxide (DMSO; AnalaR, BDH limited, Poole, England); sterile water (API IPHA, IPHA laboratory, Bandung-Indonesia); Roswell Park Memorial Institute (RPMI) 1,640 (Invitrogen Life Technologies Inc., Burlington, ON, Canada); 10% (v/v) fetal bovine serum (FBS; Gibco, Carlsbad, California, United States); chitosan (Bio-chitosan, Indonesia); and maltodextrine (Qinghuadong Lihua Starch, China).
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