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Group 1-21
Project Title Eco-friendly Synthesis of Silver and Copper nanoparticles
Synopsis Silver nanoparticles are widely used to combat antimicrobial infection, particularly against micro-organisms that have antibiotics resistance. However, the conventional method of synthesising silver nanoparticles is through the use of sodium borohydride, a toxic chemical which not only poses potential environmental and biological risks but is also expensive. Similarly, copper nanoparticles have exhibited significant antibiotic, anti­microbial, and anti­fungal properties when added to plastics (Will et al., 2003). Copper nanoparticles have also been of particular interest due to their low cost and potential applications in catalysis, cooling fluid or conductive inks (Thi et al., 2011).In this study, an eco-friendly method was used to synthesize both silver and copper nanoparticles through the reaction of silver nitrate with biomolecules present in soursop peels for silver nanoparticles and copper (II) sulfate with soursop peels for copper nanoparticles to investigate the antimicrobial properties of the synthesized silver and copper nanoparticles against Staphylococcus epidermidis (S.epidermidis). Soursop peel (Annona muricata) extract contains polyphenols and vitamin C which could act as reducing agents, reducing silver ions to silver atoms which in turn aggregate to form silver nanoparticles. Results show that 2ml of Soursop peel extract reacts with 1M of silver nitrate to produce the greatest yield of silver nanoparticles. The silver nanoparticles formed are spherical in shape and have an average size of 26 nm. It exhibited antimicrobial properties against S.epidermidis, resulting in a 96% decrease in colonies. Likewise, a synthesis of copper nanoparticles was carried out. Though some peaks were detected in the Energy-dispersive X-ray spectroscopy results, however, we cannot conclude that the presence of copper peaks as it was likely due to the copper plate on which the sample was placed on. An investigation using UV-Vis shows no peaks which suggest that no copper nanoparticles were present. The absence of copper nanoparticles was further confirmed through Scanning Electron Microscope which confirmed that copper nanoparticles were not successfully synthesised when soursop peel extract is added to copper (II) sulfate. (322 word)
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Team Members
(Names & Classes)
Group Leader:
JADEN NG��������� 3S3
Group Member/s:
CHAM JEE-AN, JARVIS��������� 3S2
CHIN QI REN��������� 3S3