Theses and Dissertations

Date of Award


Document Type


Degree Name

Master of Science (MS)



First Advisor

Dr. Jasons G. Parsons

Second Advisor

Dr. Jose J. Gutierrez

Third Advisor

Dr. Arnulfo Mar


Joshi, Leela, Green Synthesis/Biosynthesis of Silver Nanoparticles by Using Orange Peel Extract. Master of Science (MS), December, 2018, 40 pages, 23 figures, references, 36 titles. In this work, we report synthesis of silver nanoparticles (AgNPs) with an average size of ~6 nm. The aqueous solution of Ag+ ions is reduced using an aqueous extract from orange peel (Citrus Sinensis) at varying pHs. Reduction of Ag+ ions in solution was monitored using UV-visible absorption spectroscopy, and the corresponding surface plasmon resonance of AgNPs at 435 nm. The solution changed color from yellow to reddish-brown upon bioreduction of silver nitrate in orange peel extract. This eco-friendly nanobiotechnology synthesis route is preferred over toxic and expensive chemical and physical methods. The synthesis performed using a 3 mM concentration of silver nitrate at two different temperatures—room temperature and 80 °C. The resultant products were characterized by UV-vis spectroscopy, X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy, high performance liquid chromatography, and transmission Electron Microscopy techniques.


Copyright 2018 Leela Joshi. All Rights Reserved.

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