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. | Journal of Science and Technology 54 (2A) (2016) 14-20 ECO-FRIENDLY SYNTHESIS OF GOLD NANOPARTICLES USING AVERRHOA CARAMBOLA L. Nguyen Thi Nhat Hang1, 2, *, Mai Thi Ngoc Lan Thanh2, 3, Nguyen Anh Dung 2, Tran Ngoc Hung 2, Nguyen Thi Phuong Phong 1 1 University of Science Ho Chi Minh City, 227 Nguyen Van Cu street, District 5, Ho Chi Minh City, Vietnam Ho Chi Minh City 2 Thu Dau Mot University, No. 6 Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam 3 Ho Chi Minh City University of Technology, 268 Ly Thuong Kiet street, District 10, Ho Chi Minh City, Vietnam * Email: hangntn@ Received: 6 May 2016; Accepted for publication: 20 June 2016 ABSTRACT 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 ± mm, while the combination of AuNPs Averrhoa carambola L. extract showed ± mm inhibition zone when Averrhoa carambola L. extract was 285 mg/ml. Therefore, green-synthesized AuNPs by our protocol are potential to biomedical applications. Keywords: gold nanoparticles, Averrhoa carambola L., antibacterial, eco-friendly method. 1. INTRODUCTION During the past several years, the studies are focused towards greener method for the synthesis of nanoparticles. Among them, gold nanoparticles (AuNPs) are attractive materials due to their potential applications in diverse fields, including drug delivery, sensors and .
