Abstract
Ag nanoparticles (AgNPs) have been synthesized via green method using rambutan (Nephelium lappaceum L.) peel (RP) extract. RP extract was prepared by washing the RP using tap water thoroughly and boiling it in distilled water at 70°C for 60 min. RP extract and AgNO3 were used as the starting materials for the synthesis of AgNPs. RP extract was added to 10-3 M AgNO3 solution with a ratio by volume of 1:10 (RP : AgNO3), stirred at room temperature. The solution’s color changes from reddish to dark brown, indicating the reduction of Ag+ in the solution. The synthesized AgNPs were characterized using UV-Visible Spectrophotometer, FTIR Spectrophotometer, and Scanning Electron Microscopy-Energy-dispersive X-ray Spectroscopy (SEM-EDS) instruments. UV-Visible spectra show that the AgNPs have the maximum absorption band at 450 nm which is typical for AgNPs. The FTIR spectra revealed that the protein in RP extract acts as the capping agent for the synthesized AgNPs. The synthesized AgNPs were tested for their antibacterial activity against Salmonella parathypi A. The antibacterial test shows that 50 μL of AgNPs resulted in the inhibition zone of 4 mm against the aforementioned microorganism.
Highlights
Nanoparticles are known as particles with the size ranging from 1 to 100 nm [1]
Rambutan peel (RP) extract and AgNO3 were used as starting materials for the synthesis of Ag nanoparticles (AgNPs) in this work
In the synthesis of AgNPs using RP extract, the color of the extract changed from reddish to dark brown due to the reduction of Ag+ in the solution
Summary
Nanoparticles are known as particles with the size ranging from 1 to 100 nm [1]. Nanoparticles have obtained great interest due to their unique properties. The physical and chemical properties of metallic nanoparticles are different with bulk metals. Metallic nanoparticles have lower melting points, higher specific surface areas, specific optical properties, mechanical strengths and specific magnetizations [2]. Nanoparticles have been widely applied in many areas such as medicine, chemistry, pharmacy, industry, environment, biology, etc. One of the uses of nanoparticles is as antibacterial agents
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