Biogenic synthesis and antibacterial activity of controlled silver nanoparticles using an extract of Gongronema Latifolium

Publication date: Available online 15 July 2019Source: Materials Chemistry and PhysicsAuthor(s): Samson O. Aisida, Kenneth Ugwu, Paul A. Akpa, Assumpta C. Nwanya, Paul M. Ejikeme, S. Botha, Ishaq Ahmad, M. Maaza, Fabian I. EzemaAbstractBiogenic synthesis of silver nanoparticles (AgNPs) was conducted via an aqueous extract of fresh leaf of Gongronema Latifolium (FLGL) an herbaceous flowering plant as a fuel agent. The effects of different AgNO3 concentration with the fixed volume of FLGL on the properties of the formulated AgNPs were investigated. Also, the antibacterial activity AgNPs formed was observed through the solid agar plates supplemented with different concentrations of nano-sized AgNPs on Gram-negative (Coliform, Escherichia coli), and Gram-positive (Staphylococcus Aurea) bacterial strain. We observed from the various characterizations of AgNPs that the variation in the concentration of AgNO3 coupled with the incubation period played a major role in controlling the particle sizes and dispersions. The UV–visible confirmed the formation of AgNPs with the surface Plasmon resonance (SPR) peak value at 430 nm in the visible region showing the type as well as the nature of the particles in the colloidal solution. The Fourier transform infrared spectroscopy revealed the functional groups liable for the biogenic process of AgNPs. The X-ray diffraction pattern shows a single-phase crystalline structures in size range of 9–31 nm for the three concentrations. T...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research

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Publication date: Available online 8 August 2019Source: Journal of Photochemistry and Photobiology A: ChemistryAuthor(s): Peng She, Jun Li, Hegang Bao, Xiuquan Xu, Zhou HongA b s t r a c tIn this present study, a novel visible-light-driven Ag nanoparticles (Ag NPs) decorated P-doped g-C3N4 (Ag/PCN) composites were successfully fabricated via a facile method combination of one-pot pyrolysis and green reduction. The structure information of as-prepared samples were well characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoele...
Source: Journal of Photochemistry and Photobiology A: Chemistry - Category: Chemistry Source Type: research
Publication date: Available online 16 August 2019Source: Polymer TestingAuthor(s): Natalia Sienkiewicz, Sylwia CzłonkaAbstractThis paper presents the effect of natural compound (E,E)-1,7-bis(4-Hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione (curcumin) on the antibacterial, anti-aging, mechanical and morphological properties of polyurethane (PU) rigid foams. Concentrations of 1 wt%, 2 wt% and 5 wt% of antibacterial compound was used, and the infection reduction capacity was evaluated for different types of bacteria (Escherichia coli (G-) and Staphylococcus aureus (G+). In order to determine all assumed properties t...
Source: Polymer Testing - Category: Chemistry Source Type: research
Publication date: Available online 15 August 2019Source: Innovative Food Science &Emerging TechnologiesAuthor(s): Hiba N. Rajha, Anna-Maria Abi Khattar, Sally El Kantar, Nadia Boussetta, Nikolai Lebovka, Richard G. Maroun, Nicolas Louka, Eugene VorobievAbstractThe effects of aqueous extraction of bioactive compounds from pomegranate peels using conventional extraction (CE) and extraction assisted by infrared irradiation (IR), ultrasound (US), pulsed electric fields (PEF), and high-voltage electrical discharges (HVED) have been compared. For the extractions assisted by US, PEF and HVED, the saturation in extraction was ...
Source: Innovative Food Science and Emerging Technologies - Category: Food Science Source Type: research
ConclusionThe microfractionation protocol developed in this study enabled time-efficient screening of many plants species, using a small quantity of sample material. In addition, microfractionation served as a guiding tool for identifying individual antimicrobial compounds. Through this process, flavonoids were isolated from Derris scandens, out of which dalpanithin and vicenin-3 showed activity in the low micromolar range. The high hit rate for in vitro antibacterial properties from this ethnopharmacologically guided sample collection gives credence to the Sri Lankan traditional herbal medicine as a source for drug discov...
Source: Journal of Ethnopharmacology - Category: Drugs & Pharmacology Source Type: research
r H Abstract CD33 is a myeloid-associated marker and belongs to the sialic acid-binding immunoglobulin (Ig)-like lectin (Siglec) family. Such types of receptors are highly expressed in acute myeloid leukemia, which could be used in its treatment. CD33 shows high variability in its expression levels with still unknown reasons. Here, we investigated the CD33 expression of monocytes in human blood samples processed at different temperatures and in dependence on their phagocytic activity against opsonized Escherichia coli. The samples were stained by fluorescently labelled anti-human CD14 to specify the monocyte popul...
Source: General Physiology and Biophysics - Category: Physiology Authors: Tags: Gen Physiol Biophys Source Type: research
Abstract The escalating burden of antibiotic drug resistance necessitates research into novel classes of antibiotics and their mechanism of action. Pyrrolomycins are a family of potent natural product antibiotics with nanomolar activity against Gram-positive bacteria, with a yet elusive mechanism of action. In this work, we dissect the apparent Gram-positive specific activity of pyrrolomycins and show that Gram-negative bacteria are equally sensitive to pyrrolomycins when drug efflux transporters are removed, and that albumin in media plays a large role in pyrrolomycin activity. Selection of resistant mutants allo...
Source: Antimicrobial Agents and Chemotherapy - Category: Microbiology Authors: Tags: Antimicrob Agents Chemother Source Type: research
Publication date: Available online 8 August 2019Source: Journal of Saudi Chemical SocietyAuthor(s): R.S. Sathishkumar, A. Sundaramanickam, R. Srinath, T. Ramesh, K. Saranya, M. Meena, P. SuryaAbstractIn the present study, we developed an eco-friendly method of stable silver nanoparticles (AgNPs) production using the aqueous extract of Trichodesmium erythraeum. The biosynthesized AgNPs were characterized using UV-Vis spectroscopy, Fourier Transform Infrared (FTIR) spectroscopy, Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Energy-Dispersive X-ray (EDX), and X-ray diffraction (XRD). The results affirmed ...
Source: Journal of Saudi Chemical Society - Category: Chemistry Source Type: research
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Source: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Category: Chemistry Source Type: research
In this study, positively charged hydroxyapatite – barium titanate composites showed antibacterial activity against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa with remarkable inhibition zone and moreover Confocal Laser Scanning Microscopy confirmed the reduction of cell counts in polarized samples from qualitative and antibacterial rate percentage reduction studies. These bactericidal and bacteria repelling action may be attributed to the positively polarized surface of the hydroxyapatite – barium titanate composites that rupture the bacteria membrane during culture.
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
This study investigates the removal of foodborne pathogens using dielectrophoretic filter with different voltage and frequency. Experiments are conducted using food samples that are artificially contaminated by E. coli, S. aureus, S. typhi and Pseudomonas spp. Results indicate that the AC signal of 15 V with 1 MHz frequency is suitable for removing bacterial population. The efficiency of DEP system is also analyzed by Scanning Electron Microscope.
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
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