eprintid: 9208
rev_number: 2
eprint_status: archive
userid: 1
dir: disk0/00/00/92/08
datestamp: 2023-11-09 16:21:10
lastmod: 2023-11-09 16:21:10
status_changed: 2023-11-09 16:14:32
type: article
metadata_visibility: show
creators_name: Ng, H.C.
creators_name: Khe, C.S.
creators_name: Aziz, A.
creators_name: Merican, Z.M.A.
creators_name: Sokkalingam, R.
creators_name: Chew, T.L.
creators_name: Lai, C.W.
title: Biosynthesis of silver nanoparticles using unriped Carica papaya fruit extract with different PH conditions
ispublished: pub
note: cited By 0
abstract: Silver nanoparticles were successfully synthesised at room temperature from silver nitrate using unripe Carica papaya fruit extract as a reducing and capping agent. PH of the reaction solution was adjusted with the addition of sodium hydroxide from pH 5.6 (original pH of the broth) to pH 6.5, pH 7.5 and pH 8.5. Quasi spherical silver nanoparticles were obtained across the studied pH range. The average particle size obtained decreased from 34 nm to 15 nm as the pH of the solution increased from 5.6 to 8.5. From the observations and ultra violet-visible spectrophotometer analysis, the rate of reduction and formation of silver nanoparticles increased as the pH increased. The crystalline nature of the as-synthesised silver nanoparticles in a cubic structure was confirmed by the peaks in X-ray diffraction and selected area electron diffraction. From Fourier transform infrared spectra, it was found that proteins in unripe papaya fruit extract were strongly bounded to the surface of silver nanoparticles as a capping agent. The thin layer of protein coating also further confirmed under high resolution transmission electron microscope. A plausible formation mechanism has been briefly proposed. Copyright © 2017 Inderscience Enterprises Ltd.
date: 2017
publisher: Inderscience Publishers
official_url: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028698575&doi=10.1504%2fIJNP.2017.086127&partnerID=40&md5=cdfff4e6968871c28e55199d2c0bd0ce
id_number: 10.1504/IJNP.2017.086127
full_text_status: none
publication: International Journal of Nanoparticles
volume: 9
number: 2
pagerange: 55-70
refereed: TRUE
issn: 17532507
citation:   Ng, H.C. and Khe, C.S. and Aziz, A. and Merican, Z.M.A. and Sokkalingam, R. and Chew, T.L. and Lai, C.W.  (2017) Biosynthesis of silver nanoparticles using unriped Carica papaya fruit extract with different PH conditions.  International Journal of Nanoparticles, 9 (2).  pp. 55-70.  ISSN 17532507