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MTT cell viability assay. Caco-2 cells were treated with the bare MSPs and the final solids (MSPs-OA) at concentrations of 50, 100, 250, 500, 750 and 1000 μg/mL (increasing from light grey to black) for 24 h. After incubation, cell viability was quantified using MTT reagent and solubilization of formazan crystals into DMSO.
