Abstract
Addition of microwave-exposed aqueous extracellular anti-malignant guava (Psidium guajava) leaf extract to the aqueous gold chloride solution yielded stable polyshaped gold nanoparticles of high composition. Microwave-assisted route selected for the preparation of aqueous guava leaf extract was to suppress the enzymatic action. The formation of nanoparticles was understood from the UV–visible and X-ray diffraction studies. The size and shape analysis was done using field emission scanning electron microscopy, transmission electron microscopy, and atomic force microscopy. Zeta potential experiment shows that the bio-functionalized gold nanoparticles colloidal solution obtained as above will maintain its stability even after 30 weeks of storage. It is observed that the flavonoids which are separated during microwave heating of extracellular solution of the guava leaves are responsible for the biosynthesis of gold nanoparticles.











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Acknowledgments
Financial supports from DST (grant no.SR/S1/PC-10/2005), UGC (D.O. no.F.14-4/2001 (Innov.Policy/ASIST)), and BRNS, DAE (no. 2009/34/BRNS) are acknowledged. We thank Prof. G. U. Kulkarni for fruitful guidance and Selvi Rajan, JNCASR Bangalore for FESEM measurements. We are grateful to Prof. Manohar Badiger (NCL, Pune) for zeta potential measurements. Raghunandan Deshpande thanks Dr. Appala Raju, Principal of HKES College of pharmacy, Gulbarga for encouraging the research program.
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Raghunandan, D., Basavaraja, S., Mahesh, B. et al. Biosynthesis of Stable Polyshaped Gold Nanoparticles from Microwave-Exposed Aqueous Extracellular Anti-malignant Guava (Psidium guajava) Leaf Extract. Nanobiotechnol 5, 34–41 (2009). https://doi.org/10.1007/s12030-009-9030-8
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DOI: https://doi.org/10.1007/s12030-009-9030-8