scholarly journals Biosynthesis of fluorescent silver nanoparticles from Leea coccinea leaves and their antibacterial potentialities against Xanthomonas phaseoli pv phaseoli

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
María del Carmen Travieso Novelles ◽  
Annie Rubio Ortega ◽  
Beatriz Alvarez Pita ◽  
Mylene Corzo López ◽  
Lianet Díaz Pérez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Characterization ◽  
Kinetic Studies ◽  
Spectroscopic Techniques ◽  
Stabilizing Agents ◽  
Physico Chemical ◽  
Environmentally Safe ◽  
Uv Visible ◽  
Microbial Growth Inhibition ◽  
High Degree

AbstractThe synthesis of silver nanoparticles (SNP) from plants is a simple, fast and environmentally safe route. In the present study, the aqueous extract of fresh leaves from Leea coccinea L. was evaluated as a possible source of reducing and stabilizing agents to obtain SNP. The synthesized SNP were characterized by spectroscopic techniques such as UV–visible spectrophotometry and Fourier transform infrared spectroscopy (FTIR), scanning electron and confocal microscopies and the antimicrobial activity against Xanthomonas phaseoli pv. phaseoli was evaluated using agar diffusion methods. The results showed that the evaluated extract was promising for the green synthesis of the SNP, which was visually identified by the formation of a dark-brown complex and the presence of a peak of maximum absorption at 470 nm in a UV–VIS spectrum. FTIR spectrum of SNP showed main characteristic signals of aromatic compounds, carboxylic group among others confirmed by phytochemical screening that made evident the presence of flavonoids, phenols, leucoanthocyanidins, terpenes and steroids groups. Fluorescent SNP with high degree of agglomeration were observed by the microscopical technics used. A promising antibacterial activity of SNP was shown by a zone of microbial growth inhibition. These results suggested the need for going deeper in the physico-chemical characterization and kinetic studies, as well as the biological evaluations to make possible the use of this plant source in the future development of antibacterial formulations for bean seed protection.

scholarly journals Biosynthesis of Fluorescent Silver Nanoparticles From Leea Coccinea Leaves and Their Antibacterial Potentialities Against Xanthomonas Phaseoli Pv Phaseoli

2020 ◽  
Author(s):  
María del Carmen Travieso Novelles ◽  
Annie Rubio Ortega ◽  
Beatriz Alvarez Pita ◽  
Mylene Corzo López ◽  
Lianet Díaz Pérez ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Chemical Characterization ◽  
Kinetic Studies ◽  
Biological Evaluation ◽  
Spectroscopic Techniques ◽  
Zone Of Inhibition ◽  
Stabilizing Agents ◽  
Environmentally Safe ◽  
Uv Visible ◽  
High Degree

Abstract The synthesis of Silver Nanoparticles (SNP) from plants is a simple, fast and environmentally safe route. In the present study, the aqueous extract of fresh leaves from Leea coccinea L. was evaluated as a possible source of reducing and stabilizing agents to obtain SNP. The synthesized SNP were characterized by spectroscopic techniques such as UV-Visible spectrophotometry and Fourier Transform Infrared spectroscopy (FTIR), Scanning Electron and Confocal microscopies and the antimicrobial activity was evaluated against to Xanthomonas phaseoli pv. phaseoli using the agar diffusion methods. The results showed that the evaluated extract was promising for the green synthesis of the SNP, which were visually identified by the formation of a dark brown complex and by the presence of a peak of maximum absorption at 470 nm in a UV-VIS spectrum. FTIR spectrum of SNP showed main characteristic signals of aromatic compounds, carboxylic group between others confirmed through phytochemical screening that evidenced the presence of flavonoids, phenols, leucoanthocyanidins, terpenes and steroids groups. Fluorescents SNP with high degree of agglomeration were visualized by microscopies technical used. A promissory antibacterial activity of SNP was demonstrated by a zone of inhibition of the microbial growing. These results suggest the need to go deeper in the physical-chemical characterization and kinetic studies and the biological evaluation to make possible the use of this vegetable source to future develop of antibacterial formulations to the bean seeds protection.

scholarly journals Silver-Nanoparticles Embedded Pyridine-Cholesterol Xerogels as Highly Efficient Catalysts for 4-nitrophenol Reduction

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1486
Author(s):  
Ganesh Shimoga ◽  
Eun-Jae Shin ◽  
Sang-Youn Kim
Keyword(s):  
Silver Nanoparticles ◽  
Trisodium Citrate ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Physico Chemical ◽  
Efficient Reduction ◽  
Nitrophenol Reduction ◽  
Uv Visible ◽  
Average Size

Two xerogels made of 4-pyridyl cholesterol (PC) and silver-nanocomposites (SNCs) thereof have been studied for their efficient reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of aqueous sodium borohydride. Since in-situ silver doping will be effective in ethanol and acetone solvents with a PC gelator, two silver-loaded PC xerogels were prepared and successive SNCs were achieved by using an environmentally benign trisodium citrate dehydrate reducing agent. The formed PC xerogels and their SNCs were comprehensively investigated using different physico-chemical techniques, such as field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), powdered X-ray diffraction (XRD) and UV-Visible spectroscopy (UV-Vis). The FE-SEM results confirm that the shape of xerogel-covered silver nanoparticles (SNPs) are roughly spherical, with an average size in the range of 30–80 nm. Thermal degradation studies were analyzed via the sensitive graphical Broido’s method using a TGA technique. Both SNC-PC (SNC-PC-X1 and SNC-PC-X2) xerogels showed remarkable catalytic performances, with recyclable conversion efficiency of around 82% after the fourth consecutive run. The apparent rate constant (kapp) of SNC-PC-X1 and SNC-PC-X2 were found to be 6.120 × 10-3 sec-1 and 3.758 × 10-3 sec-1, respectively, at an ambient temperature.

Quantitation and Adsorption of Glyphosate Using Various Treated Clay

2017 ◽  
Vol 231 (11-12) ◽  
Author(s):  
Rodrigo Mattos ◽  
Sabir Khan ◽  
Sajjad Hussain ◽  
José de Alencar Simoni
Keyword(s):  
Low Cost ◽  
Chemical Characterization ◽  
Adsorption Capacities ◽  
Physico Chemical ◽  
As Adsorption ◽  
Uv Visible

AbstractThe objective of this work is to develop a low-cost, alternative UV-visible Spectrophotometer method using ninhydrin to the current chromatography techniques (GC and HPLC), which is usually use for the quantitation of glyphosate. The physico-chemical characterization, such as adsorption capacities, effect of time and temperature has been studied. The reaction between the ninhydrin and compounds that present NH

A Facile Method for the Synthesis of Silver Nanoparticles in the Presence of Sodium Phosphate

2011 ◽  
Vol 109 ◽  
pp. 174-177 ◽  
Author(s):  
Yu Li Shi ◽  
Qi Zhou ◽  
Li Yun Lv ◽  
Wang Hong
Keyword(s):  
Electron Microscopy ◽  
Silver Nanoparticles ◽  
Sodium Phosphate ◽  
X Ray Diffraction ◽  
Visible Spectroscopy ◽  
X Ray ◽  
Stabilizing Agents ◽  
Transmission Electron ◽  
Silver Nps ◽  
Uv Visible

A facile method for the synthesis of silver nanoparticles (NPs) has been developed by using sodium phosphate (Na3PO4) as stabilizing agents and glucose the reducing agent, respectively. The obtained silver NPs have been characterized by X-ray diffraction (XRD), UV-visible spectroscopy (UV-vis) and transmission electron microscopy (TEM). It was found that in the presence of sodium phosphate, silver NPs with different morphologies and sizes were obtained. The formation mechanism of diverse silver NPs was studied preliminarily.

scholarly journals Synthesis, Crystal Structures, Hirshfeld Surfaces Analysis and Physico-Chemical Characterization of Two New ZnII and CdII Halidometallates

2021 ◽  
Author(s):  
ali rayes ◽  
Manel moncer ◽  
Irene Ara ◽  
Dege Necmi ◽  
Brahim Ayed
Keyword(s):  
Single Crystal ◽  
Crystal Structures ◽  
Chemical Characterization ◽  
Chair Conformation ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
X Ray ◽  
3 Dimensional ◽  
Physico Chemical ◽  
Ft Ir

Abstract Two new organic-inorganic hybrid materials, based on 1,3-CycloHexaneBis-(Methyl Amine), abbreviated CHBMA, namely(H2CHBMA)ZnCl4.2H2O (CP1) and (H2CHBMA)CdI4.2H2O (CP2), have been synthesized under mild conditions in acidic media and characterized by single-crystal X-ray diffraction, spectroscopic techniques (13C NMR, FT-IR, RAMAN) and thermal analysis. The crystal structures of the two compounds were solved by single-crystal X-ray diffraction methods. Both compounds show a 3-dimensional supramolecular structure directed by various interactions between tetrahalidometallate anions (ZnCl42-, CdI42-), water molecule and organic cations (H2CHBMA)2+. For both compounds, the cyclohexane ring of the template cation is in a chair conformation with the methyl-ammonium substituent in the equatorial positions and the two terminal ammonium groups in a cis conformation but with two different orientations (upward for CP1 and downward for CP2) which influences the supramolecular architecture of the two structures. Hirshfeld surface analysis and the associated two-dimensional finger print plots were used to explore and quantify the intermolecular interactions in the crystals.

scholarly journals Phytomediated Photo-Induced Green Synthesis of Silver Nanoparticles Using Matricaria chamomilla L. and Its Catalytic Activity against Rhodamine B

Biomolecules ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1604
Author(s):  
Abdulmohsen Ali Alshehri ◽  
Maqsood Ahmad Malik
Keyword(s):  
Silver Nanoparticles ◽  
Aqueous Extract ◽  
Rhodamine B ◽  
Uv Light ◽  
Reaction Medium ◽  
Extended Period ◽  
Ftir Analysis ◽  
Matricaria Chamomilla ◽  
Stabilizing Agents ◽  
Uv Visible

The bio-fabrication of silver nanoparticles (AgNPs) was carried out through the facile green route, using the aqueous extract of Matricaria chamomilla L. Herein, we have developed a cost-efficient, ecofriendly, and photo-induced method for the biomolecule-assisted synthesis of AgNPs using an aqueous extract of Matricaria chamomilla L. as a bio-reducing and capping/stabilizing agent. The biomolecule-capped AgNPs were confirmed from the surface plasmon resonance (SPR) band at λmax = 450 nm using a UV–visible spectrometer. The stability of the AgNPs was confirmed by recording the UV–visible spectra for a more extended period, and no precipitation was observed in the sol. The morphology and structure of photo-induced biomolecule-capped AgNPs were characterized by different microscopic and spectroscopy techniques such as TEM, SEM, EDX, XRD, and FTIR analysis. The role of phytochemicals as reducing and stabilizing agents was confirmed by comparative FTIR analysis of the AgNPs and pure Matricaria chamomilla L. aqueous extract. The obtained result shows that the AgNPs are mostly spherical morphology with an average size of about 26 nm. Furthermore, the thermal stability of biomolecule-capped AgNPs was examined by TGA-DTG analysis that showed a weight loss of approximately 36.63% up to 800 °C. Moreover, the potential photocatalytic activity of photo-induced AgNPs against Rhodamine B (RB) was examined in the presence of UV light irradiation. The catalyst reusability, the effect of catalyst dosage and initial dye concentration, and the effect of the temperature and pH of the reaction medium were also assessed.

scholarly journals Physico-Chemical Characterization and Biological Screening of Cyanex 302 complexes

2012 ◽  
Vol 4 (2) ◽  
pp. 427 ◽  
Author(s):  
T. K. Pal ◽  
M. A. Alam ◽  
M. A. A. A. A. Islam ◽  
S. R. Paul
Keyword(s):  
Metal Complexes ◽  
Magnetic Measurements ◽  
Chemical Characterization ◽  
Molar Conductance ◽  
Mass Determination ◽  
Ir Studies ◽  
Cyanex 302 ◽  
Physico Chemical ◽  
Uv Visible ◽  
Antibacterial And Antifungal

Several new complexes of Cr(III), Mn(II), Fe(II), Co(II) and Cu(II) containing Cyanex 302 [bis(2,4,4-trimethylpentyl) monothiophosphinic acid] were synthesized and characterized by elemental analysis, molar conductance, molecular mass determination, magnetic, UV-Visible and IR studies. The prepared metal complexes has the compositions: 2. [CrL3].H2O, 3. K[MnL3].H2O, 4. [FeL2].H2O, 5. K[CoL3] and 6. K[CuL3].H2O (Where, L means anion of bis(2,4,4-trimethylpentyl) monothiophosphinic acid). The complexes 2, 3, 5 and 6 are assumed to have octahedral geometries, but the complex 4 is tetrahedral based on experimental data. From magnetic measurements all the complexes are found to be paramagnetic. Measured molar conductance showed that the complexes 2 and 4 are non-electrolytes and complexes 3, 5 and 6 are electrolytes. Besides, some metal complexes have shown very good antibacterial and antifungal activities.Keywords:  Bis(2,4,4-trimethylpentyl) monothiophosphinic acid; Biological activity.© 2012 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v4i2.9366 J. Sci. Res. 4 (2), 427-435 (2012)

scholarly journals Synthesis and characterization of mixed ligand catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes

2017 ◽  
Vol 52 (2) ◽  
pp. 89-96
Author(s):  
B Begum ◽  
A Sarker ◽  
AKM Lutfor Rahman ◽  
NC Bhoumik
Keyword(s):  
1H Nmr ◽  
Molar Conductance ◽  
Bidentate Ligand ◽  
Mixed Ligand ◽  
Vanadium Complexes ◽  
Spectroscopic Techniques ◽  
Physico Chemical ◽  
Ft Ir ◽  
Uv Visible

Diamine-mono-dithiocarbamates are mono-basic bidentate ligand forming stable complexes with transition metals. Mixed ligand catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes were synthesized and characterized using FT-IR, UV-visible and 1H-NMR spectroscopic techniques. The formation of vanadium complexes was con?rmed by the disappearance of ?S-H band in the complexes which was present in the ligands and incidence of ?V-S and ?V-O band in FT-IR spectra of the complexes. The mono-dithiocarbamate with one uncoordinated ?NH/NH2 group was indicated by the presence of ?N-H vibrational band in both the ligands and complexes. In the 1H-NMR spectra, the peak for –SH proton of ligands disappeared in the complexes suggest the formation of [VL2Cat] complex. Non-electrolytic nature of the synthesized complexes was established by their low molar conductance values. The +4 oxidation state of vanadium was con?rmed by the electronic spectra of the complexes. On the basis of all physico-chemical data, a six-coordinated octahedral structure has been suggested for catecholato-bis (diamine-mono-dithiocarbamato) vanadium (IV) complexes.Bangladesh J. Sci. Ind. Res. 52(2), 89-96, 2017

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