Abstract

Gold nanoflowers (GNFs) prepared by reduction of HAuCl4 by ascorbic acid were capped with human serum albumin (HSA) by either electrostatic or covalent attachment to prevent their self-aggregation. Measurement of surface plasmon resonance absorbance changes under different stress conditions showed that GNFs stabilised by covalent attachment of HSA were more stable than those stabilised by electrostatic attachment. Cytotoxicity of the covalently conjugated GNF was also studied in cultured human oral cancer cell lines by measuring the metabolic activity via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay.

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