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Hazardous phytotoxic nature of cobalt and zinc oxide nanoparticles assessed using <i>Allium cepa</i>
Ghodake, Gajanan,Seo, Yeong Deuk,Lee, Dae Sung Elsevier 2011 Journal of hazardous materials Vol.186 No.1
<P><B>Abstract</B></P><P>The increasing use of nanotechnology requires the clarification of the behavior and the effects of nanoparticles (NPs) as they are released into the environment. This study was to investigate the phytotoxicity of cobalt and zinc oxide NPs using the roots of <I>Allium cepa</I> (onion bulbs) as an indicator organism. The effects of cobalt and zinc oxide NPs on the root elongation, root morphology, and cell morphology of a plant, as well as their adsorption potential, were determined through the hydroponic culturing of <I>A</I>. <I>cepa</I>. <I>A. cepa</I> roots were treated with dispersions of the cobalt and zinc oxide NPs having three different concentrations (5, 10, and 20μgml<SUP>−1</SUP>). With increasing concentrations of the NPs, the elongation of the roots was severely inhibited by both the cobalt and the zinc oxide NPs as compared to that in the control plant (untreated <I>A. cepa</I> roots). Massive adsorption of cobalt oxide NPs into the root system was responsible for the phytotoxicity. Zinc oxide NPs caused damage because of their severe accumulation in both the cellular and the chromosomal modules, thus signifying their highly hazardous phytotoxic nature.</P>
Ghodake, G.,Kim, D.Y.,Jo, J.H.,Jang, J.,Lee, D.S. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.33 No.-
<P>This study demonstrates casein hydrolytic peptide (CHP)-mediated synthesis of crystalline gold nanoparticles (AuNPs). The AuNPs formation was triggered by the addition of an aqueous NaOH solution due to the catalytic properties of OH- and/or hydration of the functional groups of CHPs. The CHPs were capable of forming a monolayer on the AuNP surface via electrostatic interactions, thus playing an important role in long-term stability (12 months). The AuNPs resulted in lower viability in the human prostate cancer cell line as compared to the normal mouse hepatocyte cell line; this property exhibits the potential of AuNPs for applications in cancer therapy. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Biogenic Nano-Synthesis; towards the Efficient Production of the Biocompatible Gold Nanoparticles
Ghodake, Gajanan,Eom, Chi-Yong,Kim, Si-Wouk,Jin, Eon-Seon Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
We present a rapid biogenic method for the production of nanoscale gold particles using pear extract. The formation and stability of pear-derived gold nanoparticles (Pear-AuNPs) were monitored by ultraviolet-visible spectroscopy. Their morphology, elemental composition and crystalline phase were determined by transmission electron microscopy, energy-dispersive X-ray spectroscopy and selected area electron diffraction. The average core size of crystalline Pear-AuNPs was in the range of $10{\pm}5\;nm$ and the observed morphology was spherical. The X-ray photoelectron spectrum showed a strong peak for the pure 'Au' phase. The circular dichroism spectrum indicated the natural capping ability of the pear extract, which generated peptide-gold nanoparticles. These nanoparticles were stable in aqueous solution for two months. A cell viability assay of Pear-AuNPs showed biocompatibility with human embryonic kidney 293 cells. Accordingly, this eco-friendly process for the bio-mimetic production of Pear-AuNPs is nontoxic in nature; consequently, it will find potential application in nano-biotechnology.
Gajanan Ghodake,Surendra Shinde,Ganesh Dattatraya Saratale,Avinash Kadam,Rijuta Ganesh Saratale,Dae-Young Kim 한국섬유공학회 2020 Fibers and polymers Vol.21 No.4
Cellulose-based water filters are an affordable alternative to remove particulate matter; however, bacteria are toosmall to be removed simply through size exclusion. Cellulose-based water filters prepared by layer-by-layer (LBL) assemblywith polypropylene-polyethylene (PP/PE) fabric decorated with silver nanoparticles (AgNPs) were tested to remove bacteriafrom water samples. The gallic acid reduction method was used to produce potent antibacterial AgNPs; their decoration ontoPP/PE woven fabrics and the preparation of five-layered paper filters were further investigated. The use of acidic conditionsfor loading AgNPs and improving their spatial distribution onto the PP/PE fabrics, as revealed by scanning electronmicroscopy, was found to be correlated with the fabrics’ antibacterial activity. The PP/PE fabrics decorated with a higherdensity of AgNPs (at pH 2) showed 96.7 % and 97.9 % reductions in the growth of E. coli and S. aureus, respectively. Similarly, paper filters fabricated by LBL assembly of AgNP@PP/PE fabrics with cellulose filters deactivated growing E. coli and S. aureus bacteria with good efficiency: approximately 99.4 % and 98.7 %, respectively. The results indicate thatfabricating water purification filters from the cellulose-based paper is feasible with LBL type assembly. The assembled paperfilters could be commercialized for point-of-use water purification in the future to prevent the spread of water-borne diseases.
Gajanan Ghodake,Surendra Shinde,Avinash Kadam,Rijuta Ganesh Saratale,Ganesh Dattatraya Saratale,Asad Syed,Omar Shair,Marzouq Alsaedi,Dae-Young Kim 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
Metal chelation-enhanced changes in surface plasmon resonance (SPR) band of gallic acid-functionalizedAgNP solution to monitor aluminum ions (Al3+) is reported herein. In aqueous solution, Al3+ selectivelyinduced a strong absorbance with large shifts up to125 nm from the SPR band with color changing fromorange to red. This study illustrates that hydroxyl groups of phenol affect the response of a probe thattunes the absorbance maxima to a longer wavelength at 525 nm. Moreover, the rapid formation of aAgNP-Al3+ coordination complex was demonstrated by real-time monitoring, adsorptive removal, andenergy dispersive spectroscopy mapping.
Biogenic Nano-Synthesis; towards the Efficient Production of the Biocompatible Gold Nanoparticles
Gajanan Ghodake,엄치용,김시욱,진언선 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.10
We present a rapid biogenic method for the production of nanoscale gold particles using pear extract. The formation and stability of pear-derived gold nanoparticles (Pear-AuNPs) were monitored by ultraviolet-visible spectroscopy. Their morphology, elemental composition and crystalline phase were determined by transmission electron microscopy, energydispersive X-ray spectroscopy and selected area electron diffraction. The average core size of crystalline Pear-AuNPs was in the range of 10 ± 5 nm and the observed morphology was spherical. The X-ray photoelectron spectrum showed a strong peak for the pure ‘Au’ phase. The circular dichroism spectrum indicated the natural capping ability of the pear extract, which generated peptide-gold nanoparticles. These nanoparticles were stable in aqueous solution for two months. A cell viability assay of Pear-AuNPs showed biocompatibility with human embryonic kidney 293 cells. Accordingly,this eco-friendly process for the bio-mimetic production of Pear-AuNPs is nontoxic in nature; consequently, it will find potential application in nano-biotechnology.