Facile bio-synthesis of gold nanoparticles by using extract of Hibiscus sabdariffa and evaluation of its cytotoxicity against U87 glioblastoma cells under hyperglycemic condition

•Extracts of plant Hibiscus sabdariffa was used for synthesis of gold nanoparticles.•Stability of the gold nanoparticles was studied in presence of glucose.•Cytotoxicity of nanoparticles was studied against U87 Glioblastoma multiforme.•Nanoparticles were investigated for cyctotoxicity under hyperglycemic condition.