51
|
Woźniak-Budych MJ, Przysiecka Ł, Langer K, Peplińska B, Jarek M, Wiesner M, Nowaczyk G, Jurga S. Green synthesis of rifampicin-loaded copper nanoparticles with enhanced antimicrobial activity. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:42. [PMID: 28150115 DOI: 10.1007/s10856-017-5857-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 01/19/2017] [Indexed: 06/06/2023]
Abstract
The antimicrobial properties of copper and rifampicin-loaded copper nanoparticles were investigated using four strains: Staphylococcus aureus, Escherichia coli, Bacillus pumilis and Pseudomonas fluorescens. Spherical-shaped copper nanoparticles were synthesized via green reduction method from the peppermint extract. It was found that adsorption of rifampicin on the copper nanosurface enhances its biological activity and prevents the development of resistance. The interactions between rifampicin-copper nanoparticles and bacteria cells were monitored using atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). It was proven that loaded with rifampicin copper nanoparticles were able to damage the S. aureus cell membrane and facilitate the bacteria biofilm matrix disintegration. Moreover, the DNA decomposition of S. aureus treated with copper and rifampicin-copper nanoparticles was confirmed by agarose gel electrophoresis. The results obtained indicate that adsorption of rifampicin on the copper nanoparticles surface might provide the reduction of antibiotic dosage and prevent its adverse side effects.
Collapse
Affiliation(s)
- Marta J Woźniak-Budych
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland.
| | - Łucja Przysiecka
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Krzysztof Langer
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Barbara Peplińska
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Marcin Jarek
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Maciej Wiesner
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Grzegorz Nowaczyk
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| | - Stefan Jurga
- NanoBiomedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, Poznań, Poland
| |
Collapse
|
52
|
Green Hydroselenation of Aryl Alkynes: Divinyl Selenides as a Precursor of Resveratrol. Molecules 2017; 22:molecules22020327. [PMID: 28230754 PMCID: PMC6155768 DOI: 10.3390/molecules22020327] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 02/14/2017] [Accepted: 02/16/2017] [Indexed: 11/16/2022] Open
Abstract
A simple and efficient protocol to prepare divinyl selenides has been developed by the regio- and stereoselective addition of sodium selenide species to aryl alkynes. The nucleophilic species was generates in situ, from the reaction of elemental selenium with NaBH4, utilizing PEG-400 as the solvent. Several divinyl selenides were obtained in moderate to excellent yields with selectivity for the (Z,Z)-isomer by a one-step procedure that was carried out at 60 °C in short reaction times. The methodology was extended to tellurium, giving the desired divinyl tellurides in good yields. Furthermore, the Fe-catalyzed cross-coupling reaction of bis(3,5-dimethoxystyryl) selenide 3f with (4-methoxyphenyl)magnesium bromide 5 afforded resveratrol trimethyl ether 6 in 57% yield.
Collapse
|
53
|
Hisey B, Ragogna PJ, Gillies ER. Phosphonium-Functionalized Polymer Micelles with Intrinsic Antibacterial Activity. Biomacromolecules 2017; 18:914-923. [PMID: 28165737 DOI: 10.1021/acs.biomac.6b01785] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
New approaches to treat bacterial infections are badly needed to address the increasing problem of antibiotic resistance. This study explores phosphonium-functionalized block copolymer micelles as intrinsically antibacterial polymer assemblies. Phosphonium cations with varying alkyl lengths were conjugated to the terminus of a poly(ethylene oxide)-polycaprolactone block copolymer, and the phosphonium-functionalized block copolymers were self-assembled to form micelles in aqueous solution. The size, morphology, and ζ-potential of the assemblies were studied, and their abilities to kill Escherichia coli and Staphylococcus aureus were evaluated. It was found that the minimum bactericidal concentration depended on the phosphonium alkyl chain length, and different trends were observed for Gram-negative and Gram-positive bacteria. The most active assemblies exhibited no hemolysis of red blood cells above the bactericidal concentrations, indicating that they can selectively disrupt the membranes of bacteria. Furthermore, it was possible to encapsulate and release the antibiotic tetracycline using the assemblies, providing a potential multimechanistic approach to bacterial killing.
Collapse
Affiliation(s)
- Benjamin Hisey
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario , 1151 Richmond Street, London, Canada N6A 5B7
| | - Paul J Ragogna
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario , 1151 Richmond Street, London, Canada N6A 5B7
| | - Elizabeth R Gillies
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario , 1151 Richmond Street, London, Canada N6A 5B7.,Department of Chemical and Biochemical Engineering, The University of Western Ontario , 1151 Richmond Street, London, Canada N6A 5B9
| |
Collapse
|
54
|
|
55
|
Mmola M, Roes-Hill ML, Durrell K, Bolton JJ, Sibuyi N, Meyer ME, Beukes DR, Antunes E. Enhanced Antimicrobial and Anticancer Activity of Silver and Gold Nanoparticles Synthesised Using Sargassum incisifolium Aqueous Extracts. Molecules 2016; 21:E1633. [PMID: 27918447 PMCID: PMC6273965 DOI: 10.3390/molecules21121633] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 11/22/2016] [Accepted: 11/23/2016] [Indexed: 11/16/2022] Open
Abstract
A detailed, methodical approach was used to synthesise silver and gold nanoparticles using two differently prepared aqueous extracts of the brown algae Sargassum incisifolium. The efficiency of the extracts in producing nanoparticles were compared to commercially available brown algal fucoidans, a major constituent of brown algal aqueous extracts. The nanoparticles were characterised using TEM, XRD and UV/Vis spectroscopy and zeta potential measurements. The rate of nanoparticle formation was assessed using UV/Vis spectroscopy and related to the size, shape and morphology of the nanoparticles as revealed by TEM. The antioxidant, reducing power and total polyphenolic contents of the aqueous extracts and fucoidans were determined, revealing that the aqueous extracts with the highest contents produced smaller, spherical, more monodisperse nanoparticles at a faster rate. The nanoparticles were assessed against two gram-negative bacteria, two gram-positive bacteria and one yeast strain. In contrast to the literature, the silver nanoparticles produced using the aqueous extracts were particularly toxic to Gram-negative bacteria, while the gold nanoparticles lacked activity. The cytotoxic activity of the nanoparticles was also evaluated against cancerous (HT-29, MCF-7) and non-cancerous (MCF-12a) cell lines. The silver nanoparticles displayed selectivity, since the MCF-12a cell line was found to be resistant to the nanoparticles, while the cancerous HT-29 cell line was found to be sensitive (10% viability). The gold nanoparticles displayed negligible toxicity.
Collapse
Affiliation(s)
- Mokone Mmola
- School of Pharmacy, University of the Western Cape, Bellville 7535, South Africa.
- Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa.
| | - Marilize Le Roes-Hill
- Biocatalysis and Technical Biology Research Group, Institute of Biomedical and Microbial Biotechnology, Cape Peninsula University of Technology, Bellville 7535, South Africa.
| | - Kim Durrell
- Biocatalysis and Technical Biology Research Group, Institute of Biomedical and Microbial Biotechnology, Cape Peninsula University of Technology, Bellville 7535, South Africa.
| | - John J Bolton
- Department of Biological Sciences, University of Cape Town, Rondebosch 7701, South Africa.
| | - Nicole Sibuyi
- Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa.
| | - Mervin E Meyer
- Department of Biotechnology, University of the Western Cape, Bellville 7535, South Africa.
| | - Denzil R Beukes
- School of Pharmacy, University of the Western Cape, Bellville 7535, South Africa.
| | - Edith Antunes
- Department of Chemistry, University of the Western Cape, Bellville 7535, South Africa.
| |
Collapse
|
56
|
Wojcieszak D, Mazur M, Kalisz M, Grobelny M. Influence of Cu, Au and Ag on structural and surface properties of bioactive coatings based on titanium. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 71:1115-1121. [PMID: 27987668 DOI: 10.1016/j.msec.2016.11.091] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 11/14/2016] [Accepted: 11/23/2016] [Indexed: 12/31/2022]
Abstract
In this work influence of copper, silver and gold additives on structural and surface properties of biologically active thin films based on titanium have been described. Coatings were prepared by magnetron sputtering method. During each process metallic discs (targets) - Ti and the additive (Cu, Ag or Au) were co-sputtered in argon atmosphere. Structural investigation of as-deposited coatings was performed with the aid of XRD and SEM/EDS method. It was found that all prepared thin films were homogenous. Addition of Cu, Ag and Au resulted in nanocrystalline structure. Moreover, influence of these additives on hardness and antibacterial activity of titanium coatings was also studied. Ti-Cu, Ti-Ag and Ti-Au films had lower hardness as-compared to Ti. According to AAS results the difference of their activity was related to the ion migration process. It was found that Ti-Ag and Ti-Au coatings had biocidal effect related to direct contact of their surface with microorganisms. In the case of Ti-Cu antimicrobial activity had direct and indirect nature due to efficient ion migration process from the film surface to the surrounding environment. Functional features of coatings such as wettability and corrosion resistance were also examined and included in the comprehensive analysis.
Collapse
Affiliation(s)
- D Wojcieszak
- Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland
| | - M Mazur
- Faculty of Microsystem Electronics and Photonics, Wroclaw University of Technology, Janiszewskiego 11/17, 50-372 Wroclaw, Poland
| | - M Kalisz
- Motor Transport Institute, Jagiellonska 80, 03-301 Warsaw, Poland.
| | - M Grobelny
- Motor Transport Institute, Jagiellonska 80, 03-301 Warsaw, Poland
| |
Collapse
|
57
|
Cold welding of gold nanoparticles on mica substrate: Self-adjustment and enhanced diffusion. Sci Rep 2016; 6:32951. [PMID: 27597438 PMCID: PMC5011739 DOI: 10.1038/srep32951] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Accepted: 08/17/2016] [Indexed: 11/24/2022] Open
Abstract
From the images of HR-TEM, FE-SEM, and AFM, the cold welding of gold nanoparticles (AuNPs) on a mica substrate is observed. The cold-welded gold nanoparticles of 25 nm diameters are found on the mica substrate in AFM measurement whereas the size of cold welding is limited to 10 nm for nanowires and 2~3 nm for nanofilms. Contrary to the nanowires requiring pressure, the AuNPs are able to rotate freely due to the attractive forces from the mica substrate and thus the cold welding goes along by adjusting lattice structures. The gold nanoparticles on the mica substrate are numerically modeled and whose physical characteristics are obtained by the molecular dynamic simulations of LAMMPS. The potential and kinetic energies of AuNPs on the mica substrate provide sufficient energy to overcome the diffusion barrier of gold atoms. After the cold welding, the regularity of lattice structure is maintained since the rotation of AuNPs is allowed due to the presence of mica substrate. It turns out that the growth of AuNPs can be controlled arbitrarily and the welded region is nearly perfect and provides the same crystal orientation and strength as the rest of the nanostructures.
Collapse
|
58
|
Bernardi DS, Bitencourt C, da Silveira DSC, da Cruz ELCM, Pereira-da-Silva MA, Faccioli LH, Lopez RFV. Effective transcutaneous immunization using a combination of iontophoresis and nanoparticles. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 12:2439-2448. [PMID: 27431054 DOI: 10.1016/j.nano.2016.07.001] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 06/04/2016] [Accepted: 07/03/2016] [Indexed: 10/21/2022]
Abstract
Needle-free immunization strategies have been sought for years. Transcutaneous immunization using electroporation has been studied, but the high electrical voltage that must be applied may be painful and cause irreversible cell damage. The application of a weak electric field, such as in iontophoresis, has never been attempted. The aim of this work was to verify the potential of employing iontophoresis for transcutaneous immunization using ovalbumin (OVA) as a model antigen. To target the antigen presenting cells that are located in the viable epidermis, a vaccine formulation composed of OVA-loaded liposomes and silver nanoparticles (NPAg) was developed. In vitro cathodal iontophoresis of the OVA-liposomes associated with NPAg increased OVA penetration into the viable epidermis by 92-fold in comparison to passive delivery. In vivo, transcutaneous immunization with a suitable combination of liposome and iontophoresis induced the production of antibodies, differentiation of immune-competent cells and appeared to present an alternative strategy for needle-free vaccination.
Collapse
Affiliation(s)
- Daniela S Bernardi
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Claudia Bitencourt
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Denise S C da Silveira
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Estael L C M da Cruz
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Marcelo A Pereira-da-Silva
- Physics Institute of Sao Carlos-USP, Sao Carlos, SP, Brazil; Paulista Central University Center-UNICEP, Sao Carlos, SP, Brazil
| | - Lúcia Helena Faccioli
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil
| | - Renata F V Lopez
- University of São Paulo, School of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil.
| |
Collapse
|
59
|
Ahmed T, Javed S, Javed S, Tariq A, Šamec D, Tejada S, Nabavi SF, Braidy N, Nabavi SM. Resveratrol and Alzheimer’s Disease: Mechanistic Insights. Mol Neurobiol 2016; 54:2622-2635. [DOI: 10.1007/s12035-016-9839-9] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 03/04/2016] [Indexed: 12/28/2022]
|
60
|
Tannic acid-mediated green synthesis of antibacterial silver nanoparticles. Arch Pharm Res 2016; 39:465-473. [PMID: 26895244 DOI: 10.1007/s12272-016-0718-8] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 02/04/2016] [Indexed: 10/22/2022]
Abstract
The search for novel antibacterial agents is necessary to combat microbial resistance to current antibiotics. Silver nanoparticles (AgNPs) have been reported to be effective antibacterial agents. Tannic acid is a polyphenol compound from plants with antioxidant and antibacterial activities. In this report, AgNPs were prepared from silver ions by tannic acid-mediated green synthesis (TA-AgNPs). The reaction process was facile and involved mixing both silver ions and tannic acid. The absorbance at 423 nm in the UV-Visible spectra demonstrated that tannic acid underwent a reduction reaction to produce TA-AgNPs from silver ions. The synthetic yield of TA-AgNPs was 90.5% based on inductively coupled plasma mass spectrometry analysis. High-resolution transmission electron microscopy and atomic force microscopy images indicated that spherical-shaped TA-AgNPs with a mean particle size of 27.7-46.7 nm were obtained. Powder high-resolution X-ray diffraction analysis indicated that the TA-AgNP structure was face-centered cubic with a zeta potential of -27.56 mV. The hydroxyl functional groups of tannic acid contributed to the synthesis of TA-AgNPs, which was confirmed by Fourier transform infrared spectroscopy. The in vitro antibacterial activity was measured using the minimum inhibitory concentration (MIC) method. The TA-AgNPs were more effective against Gram-negative bacteria than Gram-positive bacteria. The MIC for the TA-AgNPs in all of the tested strains was in a silver concentration range of 6.74-13.48 μg/mL. The tannic acid-mediated synthesis of AgNPs afforded biocompatible nanocomposites for antibacterial applications.
Collapse
|