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Pune, India

Khatiwora E.,P.A. College | Adsul V.B.,Ym College | Ruikar A.D.,P.A. College | Deshpande N.R.,P.A. College | Kashalkar R.V.,P.A. College
Biosciences Biotechnology Research Asia

Natural products are used as traditional medicines from ancient times. They are having a great importance in Ayurveda. One of the medicinal plant species is Ipomoea carnea, which belongs to convolvulaceae family and fistulosa sub-family. Many Ipomoea species having antimicrobial activities were reported in literature. The present study explored the antibacterial activities of hexane, chloroform, ethyl acetate, acetone and methanol extracts of stem of I. carnea against, gram negative bacteria Escherichia coli(ATCC10536), Klebseilla pneumoniae (ATCC33495), Proteus mirabilis (ATCC12453) and Pseudomonas aeruginosa (ATCC10662) and gram positive becteria Bacillus subtilis (ATCC11774), Staphylococcus aureus (ATCC1026) and Bacillus cereus (ATCC10876). Air shade dried powdered material was extracted using solvents of increasing polarity from non-polar (n-haxane) to polar (methanol) solvents. These extracts were tested against above seven bacterial strains in concentration 40 iL/ml. The antibacterial activity was determined by using disc diffusion method. Streptomycin was used as a standard. Acetone and methanol extracts of J. carnea stem showed significant activity. Therefore, these extracts were selected for further investigation to determine its therapeutic potential. Source

Kadam P.M.,Smt Kasturbai Walchand College | Tarwal N.L.,Shivaji University | Mali S.S.,Shivaji University | Deshmukh H.P.,Ym College | Patil P.S.,Shivaji University
Electrochimica Acta

In the present investigation, the structural, morphological and electrochromic properties of multiwalled carbon nanotubes (MWCNT)-tungsten oxide (WO 3) composites were investigated. The WO 3 thin films were prepared by patented pulsed spray pyrolysis technique (PSPT) onto ITO coated glass substrates. A reticulated mesh like structure suitable for embedding is achieved by optimizing the deposition parameters. The functionalized MWCNT with 20-30 nm in diameter were embedded by drop casting/micro-injector method into the reticulated mesh-like morphology in WO 3 host lattice is exploited for enhanced optical modulation. Enhancement in electrochromic properties in terms of optical modulation (ΔOD), coloration efficiency (CE) and switching times (t b and t c) was studied and reported. © 2011 Elsevier Ltd. All rights reserved. Source

Kalyankar V.K.,Abasaheb Garware College | Dagade S.P.,Ym College | Waghmode S.A.,Abasaheb Garware College
Research Journal of Chemistry and Environment

In this paper, we have isolated a superoxide dismutase enzyme (SOD) from novel source Papaver somniferum L. (Poppy seeds). Isolated SOD enzyme was characterized by SOD assay, SDS-PAGE for molecular weight detection. The obtained metalloenzyme was further processed to Apo enzyme on treatment with EDTA and acetic acid. This Apo enzyme was used as a source for the synthesis of Silver nanoparticles. The Apo enzyme was optimized for pH, temperature and concentration for biosynthesis of Silver nanoparticles. Synthesized silver nanoparticles were characterized by UV-VIS, TEM, XRD and FTIR measurements. Source

Sonavane A.C.,Shivaji University | Inamdar A.I.,Shivaji University | Inamdar A.I.,Dongguk University | Dalavi D.S.,Shivaji University | And 2 more authors.
Electrochimica Acta

Nickel oxide/polypyrrole (NiO/PPy) thin films were deposited by a two step process in which the NiO layer was electrodeposited potentiostatically from an aqueous solution of NiCl2·6H2O at pH 7.5 on fluorine doped tin oxide (FTO) coated conducting glass substrates, followed by the deposition of polypyrrole (PPy) thin films by chemical bath deposition (CBD) from pyrrole mixed with ammonium persulfate (APS). The NiO/PPy films were further characterized for their structural, optical, morphological and electrochromic properties. X-ray diffraction study indicates that the films composed of polycrystalline NiO and amorphous PPy. Infrared transmission spectrum reveals chemical bonding between NiO and PPy. Rectangular faceted grains were observed from scanning electron microscopy results. The electrochromic (EC) property of the film was studied using cyclic voltammogram (CV), chronoamperometry (CA) and optical modulation. The NiO/PPy presents superior EC properties than their individual counterparts. The coloration/bleaching kinetics (response time of few ms) and coloration efficiency (358 cm2/C) were found to be improved appreciably. The dramatic improvement in electrochemical stability (from about 500 c/b cycles for PPy to 10,000 c/b cycles for NiO/PPy) was observed. This work therefore demonstrates a cost-effective and simple way of depositing highly efficient, faster and stable NiO/PPy electrodes for EC devices. © 2009 Elsevier Ltd. All rights reserved. Source

Pawar O.,Hv Desai College | Deshpande N.,Abasaheb Garware College | Dagade S.,Ym College | Waghmode S.,Abasaheb Garware College | Nigam Joshi P.,CSIR - National Chemical Laboratory
Journal of Experimental Nanoscience

Green synthesis of nanoparticles is regarded as a safe and non-toxic process whereas conventional synthesis using chemical methods produces toxic substance. This study provides a novel insight for enzymatic synthesis method of silver nanoparticles using purple acid phosphatase, isolated from Limonia acidissima (wood apple) as a new source and used in the synthesis of silver nanoparticles. Stable silver nanoparticles were produced by sonochemical method using apoenzyme as a stabilising and capping agent and were characterised by various physicochemical techniques like UV–Visible spectroscopy, Fourier-transform infrared, X-ray diffraction and transmission electron microscopy. X-ray study shows that nanoparticles are composed of silver and silver oxide. The synthesised nanoparticles exhibited excellent antimicrobial activity against Escherichia coli, Pseudomonas aeruginosa and Staphylococcus aureus. © 2015 Taylor & Francis. Source

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