BIOSYNTHESIS OF SILVER NANOPARTICLE FROM SEAWEED EXTRACT AND ITS ANTIBACTERIAL ACTIVITY AGAINST HUMAN PATHOGENS

In the present study, we report the four different seaweed (Spatoglossum asperum, Enteromorpha compressa, Caulerpa scalpelliformis and Padina gymnospora) extract to produce silver nanoparticles (AgNPs) by reduction of silver nitrate. It was noted that synthesis process was considerably rapid and silver nanoparticles were generated within few minutes of silver ions coming in contact with the seaweed extract. A peak at 419, 418, 390 and 392 nm corresponding to the plasmon absorbance of AgNPs which was noted in the UV–vis spectrum of the seaweed extract that contained silver ions. Fourier transform infrared spectroscopic analysis of the nanoparticles indicated the presence of protein which was regarding a capping agent surrounding the AgNPs. Among the four seaweed the antibacterial activity of synthesized nanoparticles from Caulerpa scalpelliformis shows maximum inhibitory activity against four tested pathogenic bacteria.