Green Synthesis of Silver Nanoparticles using Strobilanthes flaccidifolius Nees. Leaf Extract and its Antibacterial Activity

The leaf extract of Strobilanthes flaccidifolius Nees. was used for the synthesis of silver nanoparticles through a green technique of synthesis. The nanoparticles was characterized by UV-VIS spectroscopy which proves the formation silver nanoparticles. FTIR (Fourier Transmission infra red spectroscopy) study was carried out to assess the biomolecule as indigo precursors, Energy dispersion X-ray analysis(EDX) data further proves it. EPR (Electron paramagnetic resonance technique) shows the free radical in silver neutral state and XRD(X-ray diffraction technique) also repots silver neutral formation.The morphology and the shape of the silver nanoparticles were determined by Scanning electron microscopy(SEM) and Tunneling electron microscopy (TEM).The nanoparticles adopted spherical morphology and the size ranging from 6nm to 54.11nm and average size was determined as 12.15± 5.3nm.The nanoparticles had antimicrobial activit

Isolation, identification and study of some properties of a <span style="mso-bidi-font-size:12.0pt" lang="EN-US">bioactive biopolymer which crystallizes at low <span style="mso-bidi-font-size:12.0pt" lang="EN-US">temperature from <i style="mso-bidi-font-style:normal">Ficus pomifera </i>Wall </span></span>

243-247A bioactive biopolymer 1 has been isolated from the chloroform extract of leaves of Ficus pomifera Wall. which is crystallized at low temperature. The structure of 1 has been identified by using UV, IR, Mass, 1H NMR, 13C NMR, two dimensional NMR and COSY. It has been found to exist as two pairs of enantiomers which are evident from its UV, Powder-XRD and RP-HPLC data. The enantiomers are separated by chiral-HPLC and majority negative isomer is confirmed with polarimeter. The compound shows antioxidant activity and antimicrobial activity against all five species<b style="mso-bidi-font-weight: normal"> of bacteria, Proteus mirabilis<span style="font-style: normal;mso-bidi-font-style:italic">, Klebsiella pneumoniae, Escherichia coli, Salmonella paratyphi and Pseudomonas aeruginosa, and antifungal activity against Aspergillus flavus. Absolute configuration of a monomer model has been generated by TDDFT calculation. </span