Synthesis and characterization of gold nanorods using the natural products resveratrol, gallic acid, and a purified fraction of Stryphnodendron obovatum by seedless method

•Seddless synthesis of gold nanorods using natural polyphenolic compounds with pharmacological uses are described.•Natural polyphenolic compounds allows the production of more stable gold nanorods in large volumes.•Natural polyphenolic compounds can stay on gold nanorods surface after the synthesis.•The results reinforce the potencial biomedical aplication of gold nanorods produced by the described method.