Utilization of reducing potential of Kalanchoe daigremontiana extract in production of gold nanoparticles

The rapid and wonderful development of nanotechnology, both in the field of making nanoparticles and nanostructures and in the field of widespread applications, has made it one of the requirements of human life. Of the various nanoparticles, metal nanoparticles and especially gold nanoparticles have attracted more attention due to their many and increasing properties and applications. Among the three physical, biological and chemical methods for the production of nanoparticles, the biological method has the most advantages due to its cheapness, high speed, ease of production and safety and compatibility for living organisms and the environment. The aim of this study was to biosynthesis of gold nanoparticles using the extract of Kalanchoe daigremontiana. The leaf extract of plant was exposed to a solution of gold salt (HAuCl۴.۳H۲O) at a concentration of ۱ mM. The change color from pale yellow to purple red was the first sign of the production of gold nanoparticles. Subsequent spectrophotometric analysis showed a specific adsorption peak of nanoparticles (about ۵۵۰ nm). Transmission Electron Microscope (TEM), Sscanning Electron Microscope (SEM), particle size analysis (PSA) and X-ray diffraction (XRD) were used to analyze the size and shape of the nanoparticles. They showed that produced nanoparticles were spherical with an average size of ۳۵ nm. The results of infrared spectroscopy (FTIR) analysis also showed that heterocyclic compounds such as alkaloids and flavonoids in plant extracts reduce metal ions and produce gold nanoparticles.

کلیدواژه ها:

Reducing potential ، Plant ، Kalanchoe daigremontiana ، Gold nanoparticles