1
|
Motelica L, Vasile BS, Ficai A, Surdu AV, Ficai D, Oprea OC, Andronescu E, Mustățea G, Ungureanu EL, Dobre AA. Antibacterial Activity of Zinc Oxide Nanoparticles Loaded with Essential Oils. Pharmaceutics 2023; 15:2470. [PMID: 37896230 PMCID: PMC10610287 DOI: 10.3390/pharmaceutics15102470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 09/24/2023] [Accepted: 10/03/2023] [Indexed: 10/29/2023] Open
Abstract
One major problem with the overuse of antibiotics is that the microorganisms acquire resistance; thus the dose must be increased unsustainably. To overcome this problem, researchers from around the world are actively investigating new types of antimicrobials. Zinc oxide (ZnO) nanoparticles (NPs) have been proven to exhibit strong antimicrobial effects; moreover, the Food and Drugs Administration (FDA) considers ZnO as GRAS (generally recognized as safe). Many essential oils have antimicrobial activity and their components do not generate resistance over time. One of the drawbacks is the high volatility of some components, which diminishes the antimicrobial action as they are eliminated. The combination of ZnO NPs and essential oils can synergistically produce a stronger antimicrobial effect, and some of the volatile compounds can be retained on the nanoparticles' surface, ensuring a better-lasting antimicrobial effect. The samples were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopy (UV-Vis), and thermal analysis (TG-DSC) coupled with analysis of evolved gases using FTIR. The ZnO NPs, with a size of ~35 nm, exhibited a loading between 1.44% and 15.62%-the lower values were specific for limonene-containing oils (e.g., orange, grapefruit, bergamot, or limette), while high values were obtained from cinnamon, minzol, thyme, citronella, and lavender oils-highlighting differences among non-polar terpenes and alcohol or aldehyde derivatives. The antibacterial assay indicated the existence of a synergic action among components and a high dependency on the percentage of loaded oil. Loaded nanoparticles offer immense potential for the development of materials with specific applications, such as wound dressings or food packaging. These nanoparticles can be utilized in scenarios where burst delivery is desired or when prolonged antibacterial activity is sought.
Collapse
Affiliation(s)
- Ludmila Motelica
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
| | - Bogdan-Stefan Vasile
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Anton Ficai
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| | - Adrian-Vasile Surdu
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Denisa Ficai
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Ovidiu-Cristian Oprea
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| | - Ecaterina Andronescu
- National Research Center for Micro and Nanomaterials, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania; (L.M.); (E.A.)
- National Research Center for Food Safety, National University of Science and Technology POLITEHNICA Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, National University of Science and Technology POLITEHNICA Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| | - Gabriel Mustățea
- National R&D Institute for Food Bioresources—IBA Bucharest, Dinu Vintila Street 6, 021102 Bucharest, Romania
| | - Elena Loredana Ungureanu
- National R&D Institute for Food Bioresources—IBA Bucharest, Dinu Vintila Street 6, 021102 Bucharest, Romania
| | - Alina Alexandra Dobre
- National R&D Institute for Food Bioresources—IBA Bucharest, Dinu Vintila Street 6, 021102 Bucharest, Romania
| |
Collapse
|
2
|
Motelica L, Vasile BS, Ficai A, Surdu AV, Ficai D, Oprea OC, Andronescu E, Jinga DC, Holban AM. Influence of the Alcohols on the ZnO Synthesis and Its Properties: The Photocatalytic and Antimicrobial Activities. Pharmaceutics 2022; 14:pharmaceutics14122842. [PMID: 36559334 PMCID: PMC9783502 DOI: 10.3390/pharmaceutics14122842] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 12/14/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022] Open
Abstract
Zinc oxide (ZnO) nanomaterials are used in various health-related applications, from antimicrobial textiles to wound dressing composites and from sunscreens to antimicrobial packaging. Purity, surface defects, size, and morphology of the nanoparticles are the main factors that influence the antimicrobial properties. In this study, we are comparing the properties of the ZnO nanoparticles obtained by solvolysis using a series of alcohols: primary from methanol to 1-hexanol, secondary (2-propanol and 2-butanol), and tertiary (tert-butanol). While the synthesis of ZnO nanoparticles is successfully accomplished in all primary alcohols, the use of secondary or tertiary alcohols does not lead to ZnO as final product, underlining the importance of the used solvent. The shape of the obtained nanoparticles depends on the alcohol used, from quasi-spherical to rods, and consequently, different properties are reported, including photocatalytic and antimicrobial activities. In the photocatalytic study, the ZnO obtained in 1-butanol exhibited the best performance against methylene blue (MB) dye solution, attaining a degradation efficiency of 98.24%. The comparative study among a series of usual model dyes revealed that triarylmethane dyes are less susceptible to photo-degradation. The obtained ZnO nanoparticles present a strong antimicrobial activity on a broad range of microorganisms (bacterial and fungal strains), the size and shape being the important factors. This permits further tailoring for use in medical applications.
Collapse
Affiliation(s)
- Ludmila Motelica
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
| | - Bogdan-Stefan Vasile
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Anton Ficai
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| | - Adrian-Vasile Surdu
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Denisa Ficai
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
| | - Ovidiu-Cristian Oprea
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
- Correspondence:
| | - Ecaterina Andronescu
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
- National Research Center for Food Safety, University Politehnica of Bucharest, Splaiul Independentei 313, 060042 Bucharest, Romania
- Faculty of Chemical Engineering and Biotechnologies, University Politehnica of Bucharest, 1-7 Polizu St., 011061 Bucharest, Romania
- Academy of Romanian Scientists, Ilfov Street 3, 050044 Bucharest, Romania
| | - Dan Corneliu Jinga
- Department of Medical Oncology, Neolife Medical Center, Ficusului Bd. 40, 077190 Bucharest, Romania
| | - Alina Maria Holban
- Microbiology and Immunology Department, Faculty of Biology, University of Bucharest, 077206 Bucharest, Romania
| |
Collapse
|
3
|
Neacsu IA, Leau SA, Marin S, Holban AM, Vasile BS, Nicoara AI, Ene VL, Bleotu C, Albu Kaya MG, Ficai A. Collagen-Carboxymethylcellulose Biocomposite Wound-Dressings with Antimicrobial Activity. Materials (Basel) 2021; 14:1153. [PMID: 33804421 PMCID: PMC7957653 DOI: 10.3390/ma14051153] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/24/2021] [Accepted: 02/26/2021] [Indexed: 02/02/2023]
Abstract
Microbial infections associated with skin diseases are frequently investigated since they impact on the progress of pathology and healing. The present work proposes the development of freeze-dried, glutaraldehyde cross-linked, and non-cross-linked biocomposite dressings with a porous structure, which may assist the reepithelization process through the presence of collagen and carboxymethylcellulose, along with a therapeutic antimicrobial effect, due to silver nanoparticles (AgNPs) addition. Phisyco-chemical characterization revealed the porous morphology of the obtained freeze-dried composites, the presence of high crystalline silver nanoparticles with truncated triangular and polyhedral morphologies, as well as the characteristic absorption bands of collagen, silver, and carboxymethylcellulose. In vitro tests also assessed the stability, functionality, and the degradability rate of the obtained wound-dressings. Antimicrobial assay performed on Gram-negative (Escherichia coli), Gram-positive (Staphyloccocus aureus) bacteria, and yeast (Candida albicans) models demonstrated that composite wound dressings based on collagen, carboxymethylcellulose, and AgNPs are suitable for skin lesions because they prevent the risk of infection and have prospective wound healing capacity. Moreover, the cell toxicity studies proved that the obtained materials can be used in long time treatments, with no cytotoxic effects.
Collapse
Affiliation(s)
- Ionela Andreea Neacsu
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Sorina-Alexandra Leau
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
- Electrochemistry and Corrosion Department, “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, 060021 Bucharest, Romania
| | - Stefania Marin
- INCDTP-Division: Leather and Footwear Research Institute, 93 Ion Minulescu Str., 011061 Bucharest, Romania; (S.M.); (M.G.A.K.)
| | - Alina Maria Holban
- Microbiology and Immunology Department, Faculty of Biology, Research Institute of the University of Bucharest, University of Bucharest, 060101 Bucharest, Romania;
| | - Bogdan-Stefan Vasile
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Adrian-Ionut Nicoara
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Vladimir Lucian Ene
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
- National Research Center for Micro and Nanomaterials, University Politehnica of Bucharest, 060042 Bucharest, Romania
| | - Coralia Bleotu
- Stefan S. Nicolau’ Institute of Virology, Romanian Academy, 011061 Bucharest, Romania;
| | - Mădălina Georgiana Albu Kaya
- INCDTP-Division: Leather and Footwear Research Institute, 93 Ion Minulescu Str., 011061 Bucharest, Romania; (S.M.); (M.G.A.K.)
| | - Anton Ficai
- Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 060042 Bucharest, Romania; (I.A.N.); (S.-A.L.); (B.-S.V.); (A.-I.N.); (A.F.)
| |
Collapse
|
4
|
Motelica L, Popescu A, Răzvan AG, Oprea O, Truşcă RD, Vasile BS, Dumitru F, Holban AM. Facile Use of ZnO Nanopowders to Protect Old Manual Paper Documents. Materials (Basel) 2020; 13:ma13235452. [PMID: 33266076 PMCID: PMC7730434 DOI: 10.3390/ma13235452] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/24/2020] [Accepted: 11/27/2020] [Indexed: 01/23/2023]
Abstract
One of the main problems faced by libraries, archives and collectors is the mold degradation of the paper-based documents, books, artworks etc. Microfungi (molds) emerge in regular storage conditions of such items (humidity, usually over 50%, and temperatures under 21 °C). If the removal of the visible mycelium is relatively easy, there is always the problem of the subsequent appearance of mold as the spores remain trapped in the cellulosic, fibrillary texture, which acts as a net. Moreover, due to improper hand hygiene bacteria contamination, old books could represent a source of biohazard, being colonized with human pathogens. An easy and accessible method of decontamination, which could offer long term protection is therefore needed. Here, we present a facile use of the ZnO nanopowders as antimicrobial agents, suitable for cellulose-based products, conferring an extended antibacterial and anti-microfungal effect. The proposed method does not adversely impact on the quality of the cellulose documents and could be efficiently used for biodegradation protection.
Collapse
Affiliation(s)
- Ludmila Motelica
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Aurelian Popescu
- Department of Publications Restoration and Preservation, “Carol I” Central University Library, 010292 Bucharest, Romania;
| | - Anca-Gabriela Răzvan
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Ovidiu Oprea
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
- Correspondence: ; Tel.: +40-02-1402-3986
| | - Roxana-Doina Truşcă
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Bogdan-Stefan Vasile
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Florina Dumitru
- Faculty of Applied Chemistry and Material Science, University POLITEHNICA of Bucharest, 060042 Bucharest, Romania; (L.M.); (A.-G.R.); (R.-D.T.); (B.-S.V.); (F.D.)
| | - Alina-Maria Holban
- Microbiology & Immunology Department, Faculty of Biology, University of Bucharest, 077206 Bucharest, Romania;
| |
Collapse
|
5
|
Popescu RC, Savu D, Dorobantu I, Vasile BS, Hosser H, Boldeiu A, Temelie M, Straticiuc M, Iancu DA, Andronescu E, Wenz F, Giordano FA, Herskind C, Veldwijk MR. Efficient uptake and retention of iron oxide-based nanoparticles in HeLa cells leads to an effective intracellular delivery of doxorubicin. Sci Rep 2020; 10:10530. [PMID: 32601333 PMCID: PMC7324358 DOI: 10.1038/s41598-020-67207-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 06/01/2020] [Indexed: 12/12/2022] Open
Abstract
The purpose of this study was to construct and characterize iron oxide nanoparticles (IONPCO) for intracellular delivery of the anthracycline doxorubicin (DOX; IONPDOX) in order to induce tumor cell inactivation. More than 80% of the loaded drug was released from IONPDOX within 24 h (100% at 70 h). Efficient internalization of IONPDOX and IONPCO in HeLa cells occurred through pino- and endocytosis, with both IONP accumulating in a perinuclear pattern. IONPCO were biocompatible with maximum 27.9% ± 6.1% reduction in proliferation 96 h after treatment with up to 200 µg/mL IONPCO. Treatment with IONPDOX resulted in a concentration- and time-dependent decrease in cell proliferation (IC50 = 27.5 ± 12.0 μg/mL after 96 h) and a reduced clonogenic survival (surviving fraction, SF = 0.56 ± 0.14; versus IONPCO (SF = 1.07 ± 0.38)). Both IONP constructs were efficiently internalized and retained in the cells, and IONPDOX efficiently delivered DOX resulting in increased cell death vs IONPCO.
Collapse
Affiliation(s)
- R C Popescu
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Life and Environmental Physics, Reactorului 30, 077125, Magurele, Romania.,Politehnica University of Bucharest, Department of Science and Engineering of Oxide Materials and Nanomaterials, Polizu 1-7, 011061, Bucharest, Romania.,Heidelberg University, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Department of Radiation Oncology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany
| | - D Savu
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Life and Environmental Physics, Reactorului 30, 077125, Magurele, Romania.
| | - I Dorobantu
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Life and Environmental Physics, Reactorului 30, 077125, Magurele, Romania
| | - B S Vasile
- Politehnica University of Bucharest, Department of Science and Engineering of Oxide Materials and Nanomaterials, Polizu 1-7, 011061, Bucharest, Romania
| | - H Hosser
- Heidelberg University, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Center for Biomedicine and Medical Technology, Department of Anatomy and Developmental Biology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany
| | - A Boldeiu
- National Institute for Research and Development in Microtechnologies, Laboratory of Nanobiotechnology, Erou Iancu Nicolae 12A, 077190, Bucharest, Romania
| | - M Temelie
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Life and Environmental Physics, Reactorului 30, 077125, Magurele, Romania
| | - M Straticiuc
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Applied Nuclear Physics, Reactorului 30, 077125, Magurele, Romania
| | - D A Iancu
- "Horia Hulubei" National Institute for Research and Development in Physics and Nuclear Engineering, Department of Applied Nuclear Physics, Reactorului 30, 077125, Magurele, Romania
| | - E Andronescu
- Politehnica University of Bucharest, Department of Science and Engineering of Oxide Materials and Nanomaterials, Polizu 1-7, 011061, Bucharest, Romania
| | - F Wenz
- University Medical Center Freiburg, Hugstetter Straße 55, 79106, Freiburg, Germany
| | - F A Giordano
- Heidelberg University, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Department of Radiation Oncology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany
| | - C Herskind
- Heidelberg University, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Department of Radiation Oncology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany
| | - M R Veldwijk
- Heidelberg University, Medical Faculty Mannheim, Universitätsmedizin Mannheim, Department of Radiation Oncology, Theodor-Kutzer-Ufer 1-3, 68167, Mannheim, Germany.
| |
Collapse
|
6
|
Grumezescu V, Holban AM, Grumezescu AM, Socol G, Ficai A, Vasile BS, Truscă R, Bleotu C, Lazar V, Chifiriuc CM, Mogosanu GD. Usnic acid-loaded biocompatible magnetic PLGA-PVA microsphere thin films fabricated by MAPLE with increased resistance to staphylococcal colonization. Biofabrication 2014; 6:035002. [PMID: 24722318 DOI: 10.1088/1758-5082/6/3/035002] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Due to their persistence and resistance to the current therapeutic approaches, Staphylococcus aureus biofilm-associated infections represent a major cause of morbidity and mortality in the hospital environment. Since (+)-usnic acid (UA), a secondary lichen metabolite, possesses antimicrobial activity against Gram-positive cocci, including S. aureus, the aim of this study was to load magnetic polylactic-co-glycolic acid-polyvinyl alcohol (PLGA-PVA) microspheres with UA, then to obtain thin coatings using matrix-assisted pulsed laser evaporation and to quantitatively assess the capacity of the bio-nano-active modified surface to control biofilm formation by S. aureus, using a culture-based assay. The UA-loaded microspheres inhibited both the initial attachment of S. aureus to the coated surfaces, as well as the development of mature biofilms. In vitro bioevalution tests performed on the fabricated thin films revealed great biocompatibility, which may endorse them as competitive candidates for the development of improved non-toxic surfaces resistant to S. aureus colonization and as scaffolds for stem cell cultivation and tissue engineering.
Collapse
Affiliation(s)
- V Grumezescu
- Department of Science and Engineering of Oxide Materials and Nanomaterials, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street no 1-7, 011061 Bucharest, Romania. Lasers Department, Plasma and Radiation Physics, National Institute for Lasers, PO Box MG-36, Bucharest-Magurele, Romania
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
7
|
Ciobanu CS, Iconaru SL, Pasuk I, Vasile BS, Lupu AR, Hermenean A, Dinischiotu A, Predoi D. Structural properties of silver doped hydroxyapatite and their biocompatibility. Mater Sci Eng C Mater Biol Appl 2012; 33:1395-402. [PMID: 23827587 DOI: 10.1016/j.msec.2012.12.042] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 07/30/2012] [Accepted: 12/05/2012] [Indexed: 12/21/2022]
Abstract
The aim of this study was to obtain a novel hydroxyapatite-based material with high biocompatibility. The structural properties of the samples were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray Photoelectron Spectroscopy (XPS). The X-ray diffraction studies revealed the characteristic peaks of hydroxyapatite in each sample. Other phases or impurities were not observed. The scanning electron microscopy observations suggest that the doping components have no influence on the surface morphology of the samples, which reveals a homogeneous aspect of the synthesized particles for all samples. The presence of calcium (Ca), phosphor (P), oxygen (O) and silver (Ag) in the Ag:HAp is confirmed by energy dispersive X-ray (EDAX) and X-ray Photoelectron Spectroscopy analyses. Nanocrystalline silver doped HAp stimulated viability and potentiated the activation of murine macrophages.
Collapse
Affiliation(s)
- C S Ciobanu
- National Institute Materials Physics, 105 bis Atomistilor, P.O. Box MG 07, 077125 Bucuresti-Magurele, Romania
| | | | | | | | | | | | | | | |
Collapse
|
8
|
Abstract
Here we present a new approach to overcome the optical diffraction limit by using novel materials. In the paper, we report experimental results obtained by high-resolution transmission electron microscopy (HRTEM) and optical absorption spectroscopy, for a fluorescent photosensitive glass-ceramic containing rare-earth ions such as samarium (Sm). Using a home built dynamic tester, with a low power laser, we recorded nanostructures having 5 nm line widths. In the line structure, measurements reveal the presence of silver nanocrystals with few nanometre sizes. HRTEM shows that there is a random orientation of the nanocrystals. A writing mechanism with three steps is proposed.
Collapse
Affiliation(s)
- E Pavel
- Storex Technologies, Bucharest, Romania.
| | | | | | | | | | | | | |
Collapse
|