New potential green, bioactive and antimicrobial nanocomposites based on cellulose and amino acid.

New potential green, bioactive and antimicrobial nanocomposites based on cellulose and amino acid. Int J Biol Macromol. 2019 Dec 17;: Authors: Hasanin MS, Moustafa GO Abstract The present study deals with novel synthesizing method of TEMPO oxidized cellulose (extracted from bagasse) (TOC) amino acids (l-phenyl alanine (Phe) and l-tryptophan (Trp)) nano-composites as potential antimicrobial biocompatible agents. The produced nanocomposites were characterized via Fourier transform Infrared (FT-IR) spectroscopy, thermal analysis (TGA and DTGA), scanning electron microscope(SEM), and transmission electron microscope (TEM) which approved that the synthesis of composites in nano-scale in spherical shape with average particle size 72 and 44.37 nm for l-phenylalanine composite (Phe-TOC) and l-tryptophan composite (Trp-TOC) respectively. The antimicrobial studies were carried out on (i) Gram-negative bacteria: Escherichia coli (NCTC-10416) and Pseudomonas aeruginosa (NCID-9016); (ii) Gram-positive bacteria: Streptococcus aurous (NCTC-7447) and Bacillus subtilis (NCID-3610); (iii) unicellular fungi: namely, Candida albicans (NCCLS 11). The results were cleared that the both composites have high effective, rapid and broad-spectrum antimicrobial activity. The Trp-TOC showed slightly higher antimicrobial activity than Phe-TOC especially in time required of killing performance. The Phe-TOC has required 20 h for killing all microbial population while Trp-TOC requir...
Source: International Journal of Biological Macromolecules - Category: Biochemistry Authors: Tags: Int J Biol Macromol Source Type: research

Related Links:

oltronieri : The synthesis of metal nanoparticles using plant extracts is a very promising method in green synthesis. The medicinal value of Moringa oleifera leaves and the antimicrobial activity of metallic copper were combined in the present study to synthesize copper nanoparticles having a desirable added-value inorganic material. The use of a hydroalcoholic extract of M. oleifera leaves for the green synthesis of copper nanoparticles is an attractive method as it leads to the production of harmless chemicals and reduces waste. The total phenolic content in the M. oleifera leaves extract was 23.0 ± 0.3 mg...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
CONCLUSIONS: In vitro antimicrobial activity showed that the suspension of ZNPs with 250 ppm concentration could effectively cause a proper reduction and inhibition in the growth of both Gram-positive and Gram-negative microorganisms. Therefore, the results revealed the efficacy of the antibacterial properties of synthesized ZNPs suspension in aqueous media. PMID: 31847595 [PubMed - as supplied by publisher]
Source: Current Eye Research - Category: Opthalmology Authors: Tags: Curr Eye Res Source Type: research
Publication date: Available online 9 December 2019Source: PolymerAuthor(s): O.I. Timaeva, N.A. Arkharova, A.S. Orekhov, V.V. Klechkovskaya, S.P. Mulakov, G.M. Kuz'micheva, I.I. PashkinAbstractComposite hydrogels in the poly-N-vinylpyrrolidone – RE(NO3)3 × xH2O system with RE = La, Gd, Yb were prepared in various forms (native, native dried in the air, dried in air and ground into powder). They were studied by methods of wide- and small-angle X-ray scattering, differential scanning calorimetry, scanning electron microscopy, and electron microprobe analysis. The composition of native PVP and PVP with powd...
Source: Polymer - Category: Chemistry Source Type: research
Canadian Journal of Chemistry, e-First Articles. Nanoparticles, 10 –14 nm, consisting of either Fe3O4 or Co0.2Fe2.8O4 stabilized with oleic acid, were prepared using solution combustion. Their structural and magnetic properties were examined using X-ray diffractometry, scanning electron microscopy, vibrating sample magnetometry, and Fourier-transform infrared spe ctroscopy. The properties of both sets of materials are similar, except that the cobalt-doped particles are considerably less magnetic. The in vitro inhibitory activities of the nanoparticles were assessed against pathogenic bacteria Shigella dysenteriae, Kl...
Source: Canadian Journal of Chemistry - Category: Chemistry Authors: Source Type: research
Possible mechanisms of the antimicrobial effects of polypeptide‑enriched Gastrodia elata Blume extracts. Mol Med Rep. 2019 Sep 25;: Authors: Kong F, Cai X, Zhai S, Wang R, Zheng X, Ma Y, Bi H, Wang D Abstract The present study aimed to evaluate the antimicrobial activity and the possible mechanisms of activity of polypeptide‑enriched Gastrodia elata extracts (GEP) against the gram‑negative bacteria Escherichia coli and Pseudomonas aeruginosa, the gram‑positive bacterium Staphylococcus aureus and the fungus Candida albicans. The antimicrobial activity of GEP was first confirmed by determining th...
Source: Molecular Medicine Reports - Category: Molecular Biology Tags: Mol Med Rep Source Type: research
In this study, a green synthesis approach was used to create a composite hydrogel (CoHy) of RSF stabilized with CarboxymethylCellulose-Na (CMC-Na) and loaded with AgNPs. Their swelling ratios were up to 59 g/g when tested in different physiologically relevant fluids. Material characterizations by Scanning electron microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS), and X-Ray Diffraction (XRD) confirmed the presence of AgNPs on the surface. Antimicrobial properties of the CoHy samples were evaluated using agar diffusion tests. The results showed distinct inhibition zones against major microorganisms found in...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: January 2020Source: Materials Science in Semiconductor Processing, Volume 105Author(s): V. Ganesan, M. Hariram, S. Vivekanandhan, S. MuthuramkumarAbstractThe Periconium sp. extract mediated sol-gel process was effectively utilized for the synthesis of ZnO nanoparticles. The aqueous fungal extract acted as chelating agent for the Zn2+ ions and lead to the formation of gel. The dried gel was characterized by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), Thermogravimetric/differential thermal analysis (TG/DTA) respectively to identify th...
Source: Materials Science in Semiconductor Processing - Category: Materials Science Source Type: research
utarowska Studies on the functionalization of materials used for the construction of filtering facepiece respirators (FFRs) relate to endowing fibers with biocidal properties. There is also a real need for reducing moisture content accumulating in such materials during FFR use, as it would lead to decreased microorganism survival. Thus, in our study, we propose the use of superabsorbent polymers (SAPs), together with a biocidal agent (biohalloysite), as additives in the manufacturing of polypropylene/polyester (PP/PET) multifunctional filtering material (MFM). The aim of this study was to evaluate the MFM for stability...
Source: Molecules - Category: Chemistry Authors: Tags: Article Source Type: research
Fusobacteria are common obligately anaerobic Gram-negative bacteria of the oral cavity that may act as a bridge between early and late colonizing bacteria in dental plaque, and have a role in oral and extra-oral infections. Fusobacterium nucleatum has a crucial role in oral biofilm structure and ecology, as revealed in experimental and clinical biofilm models. The aim of this study was to investigate the impact of various Fusobacterium species on in vitro biofilm formation and structure in three different oral biofilm models namely a supragingival, a supragingival “feeding”, and a subgingival biofilm model. The...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
o IS, De Souza AO Abstract Biogenic silver nanoparticles (AgNPs) were obtained throughout the fungal biosynthesis using extracellular filtrate of the epiphytic fungus B. ochroleuca and were incorporated in cotton and polyester fabrics by common impregnation procedure that was repeated once, twice or four times. Both fabrics were analyzed by scanning electron microscopy (SEM), and the effectiveness of impregnation was determined using inductively coupled plasma optical emission spectrometry (ICP OES). The AgNPs loaded fabrics showed potent antimicrobial activity on Staphylococcus aureus and Escherichia coli as well...
Source: Biomedical Microdevices - Category: Biomedical Engineering Authors: Tags: Biomed Microdevices Source Type: research
More News: Biochemistry | Candida | Gastroenteritis | Nanotechnology | PET Scan | Science | Study