Development of reliable and eco-friendly process for the synthesis of metallic nanoparticles is an important step in the field of application of nanotechnology. We have developed modern method by using agriculture waste to synthesize silver nanoparticles by employing an aqueous peel extract of Annona squamosa in AgNO3. Controlled growth of silver nanoparticles was formed in 4 h at room temperature (25 °C) and 60 °C. AgNPs were irregular spherical in shape and the average particle size was about 35 ± 5 nm and it is consistent with particle size obtained by XRD Scherer equation. © 2012 Elsevier B.V. All rights reserved.

Kumar R

Computer Science

School of Computer Science and Engineering

Chennai Campus

Mohana Roopan S

Department of Chemistry

School of Advanced Sciences

Vellore Campus

Prabhakarn A

Khanna V.G

Chakroborty S.

Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

A facile microwave-assisted reaction was used to synthesize graphene oxide with cerium oxide nanoparticles (GO-CeO2 NPs) from water extracts of Moringa oleifera flower. The one step microwave synthesis treatment was used for reduction of ceria atom to cerium oxide nanoparticles along with the reduction of graphene oxide. The synthesized GO-CeO2 NPs were analysed by various analytical instrumentation techniques and we found the size of nanoparticles as 50 nm with a spherical shape. Further, the green synthesized GO-CeO2 NPs were employed as a catalyst to reduce 4-nitrophenol and achieved a degradation rate of 95.45%. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Journal of Inorganic and Organometallic Polymers and Materials

Degradation Treatment of 4-Nitrophenol by Moringa oleifera Synthesised GO-CeO2 Nanoparticles as Catalyst

Metal nanoparticles have a great impact and even change the composition of soil microbial communities. This poses the risk of their accumulation in the ecosystem, which may call on health hazard. Statistical techniques such as Plackett-Burman design, Response Surface Methodology were used for optimizing medium constituents for Bacillus cereus SVK1 and other critical variables responsible for the production of biomolecules and biosynthesis of hematite nanoparticles. The effect of hematite nanoparticles on the growth of soil bacteria were tested by agar-well diffusion method and dynamic growth curve techniques. Bacterial growth inhibition was not observed with hematite nanoparticle concentration of up to 25mg/mL. In addition, hematite nanoparticles enhanced the growth of the soil bacteria. The results show that hematite nanoparticles were non-toxic to soil bacteria indicating their scope for wide range of applications. The effective cytotoxic concentration (CTC50) of hematite nanoparticles against MCF-7, A549, Hep3B and Vero cell lines was found to be 207.58, 224.69, 193.26 and 2530μg/mL respectively. Hematite nanoparticles didn't cause lysis of red blood cells.

Colloids and Surfaces B: Biointerfaces

Evaluation of cytotoxicity of hematite nanoparticles in bacteria and human cell lines

A facile phyto chemical extracellular synthesis of Palladium nanoparticles (Pd NPs) with the help of starting material Palladium acetate and easily available wild plant Catunaregum spinosa (C. Spinosa) were developed. The phyto chemicals present in the plant acts as secondary metabolites for Pd NPs formation. In most of the industries carcinogenic dyes are released into water bodies in an uncontrolled manner among this Congo red is also released; which said to be a toxic diazo dye. These effluents can play a prominent role in affecting the flora and fauna. In this perspective Pd NPs is synthesized by using C. spinosa root bark aqueous extract in an ecofriendly manner by using bottom-up approach. Further the Pd NPs was monitored by UV–Vis spec and characterized by FT-IR, XRD, TEM, EDAX, Zeta potential. Green synthesized Pd nanomaterials identified as agglomerated spherical shape particles and size average of 47 ± 2 nm by microscopical analysis. Further the synthesized Pd NPs were investigated against the homogenous catalytic degradation Congo red results in 83%. © 2016, Springer Science+Business Media New York.

Journal of Cluster Science

Environmental Friendly Synthesis of Palladium Nanoparticles and its Photocatalytic Activity Against Diazo Dye to Sustain the Natural Source

The present work describes the eco-friendly synthesis of silver nanoparticles using dried fruit extract of C. carandas. The synthesized AgNPs were characterized by UV-Vis analysis, FTIR, XRD, SEM and TEM with histogram. The TEM image of the precipitated solid phase of AgNPs showed in the range of 23 ± 2 nm in size. Further, the catalytic degradation on crystal violet dye in the presence of C. carandas dried fruit extract and AgNPs was also studied.

Inorganic and Nano-Metal Chemistry

Green synthesis and catalytic application of silver nanoparticles usingCarissa carandasfruits

We present the microbial green synthesis of silver nanoparticles (NPs) by Streptomyces ghanaensis VITHM1 strain (MTCC No. 12465). The secondary metabolites in the cell free supernatant of this bacterium when incubated with 1 mmol/L AgNO3, mediated the biological synthesis of AgNPs. The synthesized AgNPs were characterized by UV-visible spectrum, X-ray diffraction (XRD), atomic force microscope, scanning electron microscopy equipped with energy dispersive spectroscopy, transmission electron microscopy, FT-IR spectroscopy, dynamic light scattering and zeta potential. They were highly stable and, spherical in shape with the average size of 30‒50 nm. The secondary metabolites involved in the formation of AgNPs were identified gas chromatographymass spectrography. The 3D structure of the unit cell of the synthesized AgNPs was determined using XRD data base. The synthesized AgNPs exhibited significant antibacterial activity against tested bacterial pathogens, and did not show haemolysis on human red blood cells. This green synthesis could provide a new platform to explore and use AgNPs as antibacterial therapeutic agents.[Figure not available: see fulltext.] © 2016, Higher Education Press and Springer-Verlag Berlin Heidelberg.

Frontiers of Chemical Science and Engineering

Streptomyces ghanaensis VITHM1 mediated green synthesis of silver nanoparticles: Mechanism and biological applications

Plant products may be alternative sources of parasitic control agents, since they constitute a rich source of bioactive compounds that are eco-friendly and nontoxic products. The plant extracts are good and safe alternatives due to their low toxicity to mammals and easy biodegradability. In the present study, fruit peel aqueous extract of Annona squamosa (Annonaceae) extracted by immersion method exhibited adulticidal activity against Haemaphysalis bispinosa (Acarina: Ixodidae) and the hematophagous fly, Hippobosca maculata (Diptera: Hippoboscidae), and larvicidal activity against the cattle tick Rhipicephalus (Boophilus) microplus (Acari: Ixodidae), Anopheles subpictus, and Culex quinquefasciatus (Diptera: Culicidae). The chemical composition of A. squamosa fruit peel aqueous extract was analyzed by gas chromatography-mass spectrometry. The major chemical constituent of peel aqueous extract of A. squamosa was identified as 1H- cycloprop[e]azulen-7-ol decahydro-1,1,7-trimethyl-4-methylene- [1ar-(1aα,4aα, 7β, 7 a, β, 7bα)] (28.55%) by comparison of mass spectral data and retention times. The other major constituents present in the aqueous extract were retinal 9-cis- (12.61%), 3,17-dioxo-4-androsten-11alpha-yl hydrogen succinate (6.86%), 1-naphthalenepentanol decahydro-5-(hydroxymethyl)-5,8a-dimethyl-y,2- bis(methylene)-(1α,4aβ,5α,8aα) (14.83%), 1-naphthalenemethanol decahydro -5-(5-hydroxy-3-methyl-3-pentenyl)- 1,4a-di methyl - 6-methylene -(1S-[1α, 4aα, 5α(E), 8aβ] (4.44%), (-)-spathulenol (20.75%), podocarp-7-en-3-one13β-methyl-13-vinyl- (5.98%), and 1-phenanthrene carboxaldehyde 7-ethenyl-1,2,3,4,4a,4,5,6,7,9,10,10a- dodecahydro-1,4a,7-trimethyl-[1R-(1α,4aβ.4bα,7β, 10aα)]-(5.98%). The adult and larval parasitic mortalities observed in fruit peel aqueous extract of A. squamosa were 31, 59, 80, 91, and100%; 27, 42, 66, 87, and 100%; and 33, 45, 68, 92, and 100% at the concentrations of 250, 500, 1,000, 1,500, and 2,000 ppm, respectively, against Haemaphysalis bispinosa, Hippobosca maculata, and R. microplus. The observed larvicidal efficacies were 36, 55, 72, 92, 100% and 14, 34, 68, 89, and 100% at 200, 400, 600, 800, and 1,000 ppm, respectively, against A. subpictus and C. quinquefasciatus. The highest parasite mortality was found after 24 h of exposure against Haemaphysalis bispinosa (LC50∈=∈404.51 ppm, r 2∈=∈0.890), Hippobosca maculata (LC50∈= ∈600.75 ppm, r 2∈=∈0.983), the larvae of R. microplus (LC50∈=∈548.28 ppm, r 2∈=∈0.975), fourth-instar larvae of A. subpictus (LC50∈=∈327.27 pm, r 2∈=∈0.970), and C. quinquefasciatus (LC50∈= ∈456.29 ppm, r 2∈=∈0.974), respectively. The control (distilled water) showed nil mortality in the concurrent assay. The χ 2 values were significant at p∈&lt;∈0.05 level. Therefore, the eco-friendly and biodegradable compounds from fruit peel aqueous extract of A. squamosa may be an alternative to conventional synthetic chemicals, particularly in integrated approach for the control of Haemaphysalis bispinosa, Hippobosca maculata, R. microplus, and the medically important vectors A. subpictus and C. quinquefasciatus. © 2011 Springer-Verlag.

Parasitology Research

Acaricidal, insecticidal, and larvicidal efficacy of fruit peel aqueous extract of Annona squamosa and its compounds against blood-feeding parasites

In recent years the utilization of secondary metabolites from plant extract has emerged as a novel technology for the synthesis of various nanoparticles. In this paper we studied the potential of nanocrystalline palladium nanoparticles production using acaricidal, insecticidal and larvicidal efficacy of Annona squamosa L aqueous peel extract as the biomaterial for the first time. The synthesized nanoparticles were characterized and confirmed as palladium nanoparticles by using UV-visible spectroscopy, XRD and TEM analysis. The results clearly showed that the compounds containing OH as a functional group played a critical role in capping the nanoparticles. Also the results highlight the possibility of green pathways to produce palladium nanoparticles. © 2011 Elsevier B.V.

Acaricidal, insecticidal, and larvicidal efficacy of aqueous extract of Annona squamosa L peel as biomaterial for the reduction of palladium salts into nanoparticles

Journal	Data powered by TypesetSpectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
Publisher	Data powered by TypesetElsevier BV
ISSN	1386-1425
Open Access	0