S.D.K

The synthesis, characterization and application of biologically synthesized nanomaterials are an important aspect in nanotechnology. Biological synthesis of silver nanoparticles has received a tremendous attention and has been a focus of research due to their high chemical, thermal stability and promising applications in medicinal field due to its environmental friendly approach and also low cost techniques. In the present study silver nanoparticles were synthesized using the aqueous extract of red seaweed Gracilaria dura (Ag.) J.Ag. as the reducing agent. The formation of silver nanoparticles was confirmed by colour change, UV-Visible Spectroscopy, FT-IR and X-Ray Diffraction Method (XRD). The nanoparticles showed an absorbance at 446nm on UV-Vis spectroscopy. The presence of proteins was identified by Fourier Transform-Infra Red spectroscopy (FT-IR).The presence of elemental silver was characterized by X-Ray Diffraction Method (XRD).These results not only provide a green approach for the synthesis of nanoparticles but also open a door for new pharmaceutical leads.

The present report deals with the study of phytochemicals present in Padina tetrastromatica Hauck collected from the south east coast of Tamil Nadu, India. The phytochemicals of different extracts was analyzed by the standard procedure for UV-Vis spectroscopic and HPLC. The UV-Vis phytochemical profile of different extracts of Padina tetrastromatica Hauck was predicted. The qualitative HPLC fingerprint profile of methanol extract of Padina tetrastromatica Hauck was chosen at a wavelength of 660 nm due to sharpness of the peaks and suitable baseline. The profile showed one prominent peak at a retention time of 1.500 min and seven moderate peaks were also noted at the retention times of 2.220, 2.400, 2.500, 2.800, 3.000, 3.300 and 6.300 min respectively. The present study on Padina tetrastromatica Hauck fashioned a novel phytochemical marker in standardization of the quality of the drug used for medicine.