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Mesenchymal stem cells viability measured by mitochondrial activity depletion in the control group and cells treated with graphene oxide nanofilm (nGO), l-glutamine (L-Glu) and nGO with L-Glu supplementation (nGOxL-Glu). MTT assay was performed after 48 h of primary culture. The error bars represent standard error of mean (n = 6 per group). Different letters (a–b) above the columns indicate statistically significant differences (p ≤ 0.05) analysed by Tukey’s HSD test
