ECO-FRIENDLY SYNTHESIS OF GOLD NANOPARTICLES USING AVERRHOA CARAMBOLA L.
Keywords:gold nanoparticles, Averrhoa carambola L., antibacterial, eco-friendly method.
In this work we report an eco-friendly method for the synthesis of gold nanoparticles (AuNPs) using Averrhoa carambola L. fruit extract at different temperatures. AuNPs were formed and coated conjugatedly with the components of aqueous fruit extract of Averrhoa carambola L. as verified under UV-vis spectroscopy, transmission electron microscopy (TEM) and used for testing of antimicrobial activity. AuNPs - Averrhoa carambola L. extract combination showed synergistic effect on the antibacterial activity as judged by well diffusion method. AuNPs alone did not showed the antibacterial activity, and Averrhoa carambola L. extract had the inhibition zone of 8.8 ± 1.08 mm, while the combination of AuNPs - Averrhoa carambola L. extract showed 16.33 ± 2.33 mm inhibition zone when Averrhoa carambola L. extract was 285 mg/ml. Therefore, green-synthesized AuNPs by our protocol are potential to biomedical applications.