Synthesis of N, Zn-doped carbon dots for the detection of Fe3+ ions and bactericidal activity against Escherichia coli and Staphylococcus aureus

Publication date: Available online 6 December 2019Source: Journal of Photochemistry and Photobiology B: BiologyAuthor(s): Sai Kumar Tammina, Yang Wan, Yan Yan Li, Yaling YangAbstractA simple and one-step microwave digestion method was utilized to synthesize the highly photoluminescent glucosamine derived nitrogen and zinc doped carbon dots (N, Zn-CDs) with a bluish-green luminescence property. The synthesized N, Zn-CDs inherited a good photoluminescence property with a quantum yield of 74% and which were characterized with XPS, XRD, TEM, FT-IR, UV–Vis, and fluorescence spectrometry. More importantly N, Zn-CDs served as a fluorescence sensor for the detection of Fe3+ ions, under optimal conditions, a good linear relationship was established in the concentration range of 0.25–125 μM. Also, the experimental results showed the detection limit of N, Zn-CDs against Fe3+ was 0.15 μM, this could be a promising assay for sensing Fe3+ ions. In addition, the role of zinc doping was also explored by conducting the detection under the similar experimental conditions in the absence of zinc, reports revealed the reason for high photoluminescence was due to the zinc doping. Along with the sensing application, our group had investigated the bactericidal property of synthesized N, Zn-CDs against gram-negative (Escherichia coli) and gram-positive pathogens (Staphylococcus aureus). N, Zn-CDs displayed good bactericidal activity against both pathogens under light condition, ...
Source: Journal of Photochemistry and Photobiology B: Biology - Category: Speech-Language Pathology Source Type: research

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Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
Publication date: Available online 11 January 2020Source: Biocatalysis and Agricultural BiotechnologyAuthor(s): Bruna Jummes, William Gustavo Sganzerla, Cleonice Gonçalves da Rosa, Carolina Montanheiro Noronha, Michael Ramos Nunes, Fabiano Cleber Bertoldi, Pedro Luiz Manique BarretoAbstractPalmarosa (Cymbopogon martinii) essential oil is a rich source of geraniol monoterpene, with antimicrobial and antioxidant properties. However, bioactive compounds present chemical instability under adverse temperature conditions due to their high volatility characteristics. Therefore, the aim of this work was to produce poly-&eps...
Source: Biocatalysis and Agricultural Biotechnology - Category: Biotechnology Source Type: research
Abstract In this article, an original method is proposed for address and covalent immobilization of anti-E. coli antibodies on a screen-printed electrode (SPE). The method is based on a copper-catalyzed "click" reaction between a polyvinylbenzylazide (PVBA) film electrochemically deposited on the electrode surface and acetylene fragments of propargyl-N-hydroxysuccinimide ester. The products of electrochemical oxidation of copper particles incorporated in the polymer film on the electrode were first used for catalysis of the click reaction. This approach allowed us to reduce the immobilization time from a...
Source: Analytical and Bioanalytical Chemistry - Category: Chemistry Authors: Tags: Anal Bioanal Chem Source Type: research
Publication date: January 2020Source: Saudi Journal of Biological Sciences, Volume 27, Issue 1Author(s): Jehan S. Al-Brahim, Afrah E. MohammedAbstractNowadays, the innovative study of silver nanoparticles (AgNPs) is excessive since they have incredible biomedical applications. The current study aimed to find out the potential of honey from two different floral sources (Ziziphus spina-christi and Acacia gerrardii) as biogenic mediators to synthesize AgNPs and to evaluate their antioxidant, cytotoxic and antimicrobial abilities. Biogenic AgNPs were studied for particle characterizations and the expected biomolecules helped i...
Source: Saudi Journal of Biological Sciences - Category: Biology Source Type: research
Publication date: Available online 24 December 2019Source: Journal of Alloys and CompoundsAuthor(s): P. Hajipour, A. Bahrami, A. Eslami, A. Hosseini-Abari, H. Hagh RanjbarAbstractCopper oxide particles have found applications as strong photocatalytic antibacterial agents in recent years. This paper investigates the facile chemical bath deposition synthesis and antibacterial properties of nanocrystalline CuO, CuO-GO, and CuO-GO-Ag nanocomposites. CuO samples were synthesized through a chemical bath deposition method and the introduction of GO nanosheets and silver nanoparticles into the precursor solutions was used to obtai...
Source: Journal of Alloys and Compounds - Category: Chemistry Source Type: research
Staphylococcus aureus causes localized infections or invasive diseases (abscesses or endocarditis). One of its virulence factors is staphylocoagulase (SCG), which binds prothrombin to form a complex with thrombin-like proteolytic activity and leads to uncontrolled fibrin generation at sites of bacterial inoculation. The aim of this study was to characterize the formation, structure, mechanical properties and lysis of SCG-generated clots. Recombinant SCG was expressed in Escherichia coli, purified and the amidolytic activity of its complexes with human prothrombin (SCG-PT) and thrombin (SCG-T) was determined using human thr...
Source: Frontiers in Immunology - Category: Allergy & Immunology Source Type: research
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Source: Saudi Journal of Biological Sciences - Category: Biology Source Type: research
Publication date: Available online 16 December 2019Source: European Polymer JournalAuthor(s): Roya Sedghi, Marziye Gholami, Alireza Shaabani, Mahyar Saber, Hassan NiknejadAbstractThe aim of this study was to prepare the new chitosan derivative nanofibers and evaluate their potential in the prevention of local breast cancer recurrence. In this work, the anticancer properties of nanofibers were increased and the side effects of using them were minimized. The chemical structure and morphology of the nanofibers were investigated by Fourier transform infrared spectroscopy (FT-IR), CHNS elemental analysis, X-ray diffraction (XRD...
Source: European Polymer Journal - Category: Chemistry 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 13 December 2019Source: Chinese Chemical LettersAuthor(s): Li Jin, Xun Liu, Changhao Bian, Jie Sheng, Yishan Song, Yongheng ZhuAbstractTo develop a novel food preservation technology for efficiently enhance bactericidal activity in a long term, hollow mesoporous silica spheres (HMSS) with regular nanostructures were applied to encapsulate natural organic antimicrobial agents. The chemical structures, morphologies and thermal stabilities of linalool, HMSS and linalool-functionalized hollow mesoporous silica spheres (L-HMSS) nanoparticles were evaluated by polarimeter, field emission scanni...
Source: Chinese Chemical Letters - Category: Chemistry Source Type: research
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