In the obtained spectra, the Bragg peak position and their intensities were compared with the standard JCPDS files. The result shows that the particles have a cubic structure. The size of the Autophagy animal study silver nanoparticles was found OICR-9429 cost to be 5 nm. The XRD pattern thus clearly indicated that the AgNPs formed in the present synthesis were crystalline
in nature. Pasupuleti et al. and other reserachers observed a similar XRD pattern of silver nanoparticles using Rhinacanthus nasutus leaf extract. Some unassigned peaks (*) have also been observed suggesting that the crystallization of bio-organic phase [26, 30–33]. Figure 2 XRD pattern of silver nanoparticles synthesized using A. cobbe leaf broth. FTIR spectra of AgNPs The FTIR spectra were recorded to identify potential biomolecules that contributed to the reduction of the Ag+ ions and to the capping of the bioreduced AgNPs . Figure 3A shows FTIR spectra of A. cobbe leaf extract observed at 3,420 and 1,730 cm-1 are characteristic of the O-H and C = O stretching modes for the OH and C = O groups possibly
secondary metabolites of leaf extract. Figure 3B shows the FTIR spectra of purified silver nanoparticles, the presence of bonds due to O-H stretching (around 3,441 cm-1), C = O group (around 1,636 cm-1), the peak at 1,636 cm-1 could be assigned to the vibrations due to amide I band present in the proteins and the peak around 1,384 cm-1 assigned to geminal methyl group. The minor band 1,054 cm-1 corresponds to C-N stretching alcohols, Oxymatrine the band 594, and 887 cm-1 regions for C-H out of plane selleck bend, which are characteristics of aromatic phenols . The spectra also illustrate a prominent shift in the wave numbers corresponding to amide I band (1,636 cm-1) and amide II band (1520 cm-1) linkages, validates that free amino (-NH2) or carboxylate (-COO-)
groups in compounds of the A. cobbe leaf extract have interacted with AgNPs surface making AgNPs highly stable. The energy at this vibration is sensitive to the secondary and tertiary structure of the proteins. The band observed at 3,441 cm-1 was characteristic of - NH stretching of the amide (II) band. Several bands between 2,000 cm-1 to 3,000 cm-1 were absent, which could be attributed to protein precipitation occurring during the reduction and stabilization of the AgNPs . We have observed some additional peaks of silver nanoparticles located at around 1,054 cm-1 can be assigned as the C-N stretching vibrations of amine. This present result obtained from A.cobbe agrees with those reported previously for Rhinacanthus nasutus , Thevetia peruviana , latex of Jatropha curcas . Our observation lends support to a previous study in which formation of spherical silver nanoparticles was reported by using various plant extracts. Further, the FTIR patterns of A.