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| Green Synthesis of Gold Nanoparticles Using Lallamantia Royleana Seed Extract and Evaluation of Its Antioxidant Activity |
Samina Rashid Ahmed, Sadia Noor, Maria Anwar Khan
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Abstract:
The development of an eco-friendly protocol for the synthesis of nanomaterials is an important aspect of research in nanotechnology. The present study demonstrates a facile and rapid synthesis of gold nanoparticles (AuNPs) by Lallementia royleana (LR) seed extract for some potential biomedical applications. The synthesized AuNPs were characterized by UV-visible spectroscopy, Fourier transform infrared (FTIR) spectroscopy, atomic absorption spectroscopy (AAS) and thermogravimetric analysis (TGA). The LR seed extract played a dual role by reducing Au+3 to Au0 and stabilizing the resulting NPs. The formation of AuNPs was confirmed through UV-visible spectroscopy by measuring characteristic ?SPR peaks between 532-554 nm. The different reaction parameters; amount of LR mucilage, temperature and pH were optimized using conventional method. The optimum conditions were found to be; LR amount (10.0 mL), temperature (60 °C) and pH (12) to obtain the high yield of AuNPs with narrow size distribution. Fourier transform infrared analysis showed the interaction between AuNPs and functional groups responsible for reduction and stabilization. Unreacted amount of gold ions was measured by atomic absorption spectroscopy and maximum yield was found to be 94.45 %. The surface topography was observed by atomic force microscopy. The antioxidant potential of synthesized AuNPs was evaluated by DPPH, hydroxyl radical scavenging and reducing power assays which shows a concentration dependent effect on the antioxidant potential of AuNPs.
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