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Pérez-Flores J, Borges-Ramírez MM, Vargas-Contreras JA, Osten JRV. Inter-annual variation in the microplastics abundance in feces of the Baird's tapir (Tapirus bairdii) from the Selva Maya, México. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 941:173659. [PMID: 38839015 DOI: 10.1016/j.scitotenv.2024.173659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2024] [Revised: 05/10/2024] [Accepted: 05/29/2024] [Indexed: 06/07/2024]
Abstract
Microplastics (MPs) are found in a wide range of ecosystems, from the Arctic to the deep ocean. However, there is no data on their presence in terrestrial mammals that inhabit the Selva Maya. The aim of this study is to detect the presence of MPs in the feces of the Baird's tapir (Tapirus bairdii) from the region of Calakmul, located in the Yucatan Peninsula, Mexico. We analyzed 129 fecal samples collected during 2017 and 2018, obtaining 57 and 72 samples during the rainy and dry seasons respectively. Sixty-eight percent of the samples contained 743 MPs with a mean of 19.3 ± 28.1 MPs/kg of dry weight (DW) feces in both years. An inter-annual variation in the average abundance of microplastic was observed during the two-year period (2017-2018), with a 72 % increase in these plastic particles in feces. Fourteen polymers were identified, with ethylene vinyl acetate (EVA), polypropylene (PP) and polyester (PES) being the most abundant during both years. Although the effects of MPs on the health of tapirs are not known, their presence is cause for concern. There is an urgent need for the implementation of appropriate plastic waste management programs in communities of the Selva Maya to diminish the consumption of MPs in species including humans where they pose a significant risk to health. ENVIRONMENTAL IMPLICATIONS: The use of plastics worldwide is increasing every day, so the presence of microplastics is and will continue to be a major environmental problem. It is known that contaminants can adhere to plastics, making them hazardous materials. Microplastics can contaminate remote areas such as Biosphere Reserves. Terrestrial species such as the tapir can ingest microplastics, putting their health at risk. Knowing the dispersion of microplastics is very important in order to manage them properly, taking into account their emission sources and type of polymer.
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Affiliation(s)
- Jonathan Pérez-Flores
- Consejo Nacional de Humanidades, Ciencia y Tecnología (CONAHCYT), Av. Insurgentes Sur 1582, CP 03940 Ciudad de México, Ciudad de México, Mexico; El Colegio de La Frontera Sur (ECOSUR), Unidad de Chetumal, Avenida Centenario Km 5.5, CP 77014 Chetumal, Quintana Roo, Mexico
| | - Merle M Borges-Ramírez
- Instituto de Ecología, Pesquería y Oceanografía del Golfo de México (EPOMEX), Universidad Autónoma de Campeche, Campus VI, Av. Héroe de Nacozari 480, CP 24070, Campeche, Campeche, Mexico
| | - Jorge A Vargas-Contreras
- Facultad de Ciencias Químico-Biológicas, Universidad Autónoma de Campeche, Campus V, Av. Ex Hacienda Kalá S/N, CP 24085 Campeche, Campeche, Mexico
| | - Jaime Rendón-von Osten
- Instituto de Ecología, Pesquería y Oceanografía del Golfo de México (EPOMEX), Universidad Autónoma de Campeche, Campus VI, Av. Héroe de Nacozari 480, CP 24070, Campeche, Campeche, Mexico.
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Alghanem S, Dziurkowska E, Ordyniec-Kwaśnica I, Sznitowska M. Intraoral medical devices for sustained drug delivery. Clin Oral Investig 2023; 27:7157-7169. [PMID: 37982874 PMCID: PMC10713785 DOI: 10.1007/s00784-023-05377-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 11/05/2023] [Indexed: 11/21/2023]
Abstract
OBJECTIVES The oral cavity constitutes an attractive organ for the local and systemic application of drug substances. Oromucosal tablets, gels, or sprays are examples of the formulations applied. Due to the elution through the saliva, the residence time of the formulation at the application site is relatively short. Medical devices placed in the oral cavity, with a reservoir for an active substance, play an important role in solving this problem. MATERIALS AND METHODS In this review, we discuss the devices described in the literature that are designed to be used in the oral cavity, highlighting the advantages, disadvantages, and clinical applications of each of them. RESULTS Among the intraoral medical devices, special types are personalized 3D-printed devices, iontophoretic devices, and microneedle patches. CONCLUSION We anticipate that with the development of 3D printing and new polymers, the technology of flexible and comfortable devices for prolonged drug delivery in the oral cavity will develop intensively. CLINICAL RELEVANCE The presented review is therefore a useful summary of the current technological state, when in fact none of the existing devices has been widely accepted clinically.
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Affiliation(s)
- Suhail Alghanem
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416, Gdansk, Poland
| | - Ewelina Dziurkowska
- Department of Analytical Chemistry, Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416, Gdansk, Poland.
| | - Iwona Ordyniec-Kwaśnica
- Department of Dental Prosthetics, Faculty of Medicine, Medical University of Gdansk, Str. E. Orzeszkowej 18, 80-208, Gdansk, Poland
| | - Małgorzata Sznitowska
- Department of Pharmaceutical Technology, Faculty of Pharmacy, Medical University of Gdansk, Al. Gen. J. Hallera 107, 80-416, Gdansk, Poland
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de Carvalho LD, Peres BU, Shen Y, Haapasalo M, Maezono H, Manso AP, Ko F, Jackson J, Carvalho RM. Chlorhexidine-Containing Electrospun Polymeric Nanofibers for Dental Applications: An In Vitro Study. Antibiotics (Basel) 2023; 12:1414. [PMID: 37760711 PMCID: PMC10526102 DOI: 10.3390/antibiotics12091414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/29/2023] [Accepted: 09/01/2023] [Indexed: 09/29/2023] Open
Abstract
Chlorhexidine is the most commonly used anti-infective drug in dentistry. To treat infected void areas, a drug-loaded material that swells to fill the void and releases the drug slowly is needed. This study investigated the encapsulation and release of chlorhexidine from cellulose acetate nanofibers for use as an antibacterial treatment for dental bacterial infections by oral bacteria Streptococcus mutans and Enterococcus faecalis. This study used a commercial electrospinning machine to finely control the manufacture of thin, flexible, chlorhexidine-loaded cellulose acetate nanofiber mats with very-small-diameter fibers (measured using SEM). Water absorption was measured gravimetrically, drug release was analyzed by absorbance at 254 nm, and antibiotic effects were measured by halo analysis in agar. Slow electrospinning at lower voltage (14 kV), short target distance (14 cm), slow traverse and rotation, and syringe injection speeds with controlled humidity and temperature allowed for the manufacture of strong, thin films with evenly cross-meshed, uniform low-diameter nanofibers (640 nm) that were flexible and absorbed over 600% in water. Chlorhexidine was encapsulated efficiently and released in a controlled manner. All formulations killed both bacteria and may be used to fill infected voids by swelling for intimate contact with surfaces and hold the drug in the swollen matrix for effective bacterial killing in dental settings.
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Affiliation(s)
- Luana Dutra de Carvalho
- Department of Oral Health Sciences, Division of Restorative Dentistry, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (L.D.d.C.); (A.P.M.)
| | - Bernardo Urbanetto Peres
- Department of Oral Biological and Medical Sciences, Division of Biomaterials, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (B.U.P.); (R.M.C.)
| | - Ya Shen
- Department of Oral Health Sciences, Division of Endodontics, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (Y.S.); (M.H.)
| | - Markus Haapasalo
- Department of Oral Health Sciences, Division of Endodontics, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (Y.S.); (M.H.)
| | - Hazuki Maezono
- Department of Restorative Dentistry and Endodontology, Graduate School of Dentistry, Osaka Dental University, Osaka 565-0871, Japan;
| | - Adriana P. Manso
- Department of Oral Health Sciences, Division of Restorative Dentistry, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (L.D.d.C.); (A.P.M.)
| | - Frank Ko
- Department of Materials Engineering, Faculty of Applied Sciences, University of British Columbia, 309-6350 Stores Road, Vancouver, BC V6T 1Z4, Canada;
| | - John Jackson
- Faculty of Pharmaceutical Sciences, University of British Columbia, 2405 East Mall, Vancouver, BC V6T 1Z3, Canada
| | - Ricardo M. Carvalho
- Department of Oral Biological and Medical Sciences, Division of Biomaterials, Faculty of Dentistry, University of British Columbia, 2199 Wesbrook Mall, Vancouver, BC V6T 1Z3, Canada; (B.U.P.); (R.M.C.)
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Benchaphanthawee W, Peng CH. Organo-Cobalt Complexes in Reversible-Deactivation Radical Polymerization. CHEM REC 2021; 21:3628-3647. [PMID: 34132014 DOI: 10.1002/tcr.202100122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/25/2021] [Indexed: 01/15/2023]
Abstract
Cobalt complexes have played an essential role in different chemical reactions. One of them that has attracted substantial attention in polymer science is cobalt mediated radical polymerization (CMRP), which is famous for its remarkable efficiency in controlling the radical polymerization of vinyl acetate (VAc) and other less active monomers (LAMs). Two pathways, reversible termination (RT) and degenerative transfer (DT), were recognized to control the polymerization in CMRP and could be further used to rationalize the mechanism of other RDRP methods. These control mechanisms were then found to be correlated to the redox potential of cobalt complexes and thus could be judged more quantitatively. The control of polymer composition and tacticity could also be achieved by using CMRP. The hybridization of CMRP and atom transfer radical polymerization (ATRP) could directly synthesize the vinyl acetate/methyl methacrylate and vinyl acetate/styrene block copolymers in one pot. The copolymer of acrylates and 1-octene could be obtained by visible-light-induced CMRP. With the addition of bulky Lewis acid, CMRP of N,N-dimethylacrylamide (DMA) showed high isotacticities with the contents of meso dyads (m) and meso triads (mm) up to 94 % and 87 %, respectively, and generated the crystalline PDMA with Tm as high as 276 °C. This personal account reviewed the development of CMRP with the mechanistic understanding, the control of composition and stereoselectivity of the polymeric products, and its perspective.
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Affiliation(s)
- Wachara Benchaphanthawee
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, 101, Sec 2, Kuang-Fu Rd., 30013, Hsinchu, Taiwan
| | - Chi-How Peng
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, 101, Sec 2, Kuang-Fu Rd., 30013, Hsinchu, Taiwan
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Maluf CV, Peroni LV, Menezes LR, Coutinho W, Lourenço EJV, Telles DDM. Evaluation of the physical and antifungal effects of chlorhexidine diacetate incorporated into polymethyl methacrylate. J Appl Oral Sci 2020; 28:e20190039. [PMID: 31939520 PMCID: PMC6919199 DOI: 10.1590/1678-7757-2019-0039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Accepted: 08/12/2019] [Indexed: 11/25/2022] Open
Abstract
This study aimed to evaluate the physical properties and antifungal activities of polymethyl methacrylate (PMMA) acrylic resins after the incorporation of chlorhexidine diacetate salt (CDA).
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Affiliation(s)
- Caroline Vieira Maluf
- Universidade do Estado do Rio de Janeiro, Departamento de Prótese Dentária, Rio de Janeiro, Rio de Janeiro, Brasil
| | - Luciana Vieira Peroni
- Universidade do Estado do Rio de Janeiro, Departamento de Prótese Dentária, Rio de Janeiro, Rio de Janeiro, Brasil
| | - Lívia Rodrigues Menezes
- Universidade Federal do Rio de Janeiro, Instituto de Macromoléculas Eloisa Mano, Rio de Janeiro, Rio de Janeiro, Brasil
| | - Wagner Coutinho
- Universidade do Estado do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brasil
| | - Eduardo José Veras Lourenço
- Universidade do Estado do Rio de Janeiro, Departamento de Prótese Dentária, Rio de Janeiro, Rio de Janeiro, Brasil
| | - Daniel de Moraes Telles
- Universidade do Estado do Rio de Janeiro, Departamento de Prótese Dentária, Rio de Janeiro, Rio de Janeiro, Brasil
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Tae BS, Park JH, Kim JK, Ku JH, Kwak C, Kim HH, Jeong CW. Comparison of intraoperative handling and wound healing between (NEOSORB® plus) and coated polyglactin 910 suture (NEOSORB®): a prospective, single-blind, randomized controlled trial. BMC Surg 2018; 18:45. [PMID: 29980202 PMCID: PMC6035400 DOI: 10.1186/s12893-018-0377-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 06/26/2018] [Indexed: 01/27/2023] Open
Abstract
Background Coated polyglactin 910 suture with chlorhexidine (NEOSORB® Plus) has recently been developed to imbue the parent suture with antibacterial activity against organisms that commonly cause surgical site infections (SSI). This prospective, single-blinded, randomized trial, was performed to compare the intraoperative handling and wound healing characteristics of NEOSORB® Plus with those of the traditional polyglactin 910 suture (NEOSORB®) in urologic surgery patients. Methods Patients (aged 19 to 80 years, n = 100) were randomized in a 1:1 ratio for treatment with either NEOSORB® Plus or NEOSORB®, and stratified into an open surgery or a minimally invasive surgery group. The primary endpoint was the assessment of overall intraoperative handling of the sutures. Secondary endpoints included specific intraoperative handling measures and wound healing characteristics. Wound healing was assessed at one and 11 days after surgery. Cumulative skin infection, seroma, and suture sinus events within 30 days after surgery were also evaluated. Results A total of 96 patients were included, with 47 patients in the NEOSORB® Plus group and 49 patients in the NEOSORB® group. Scores for intraoperative handling were favorable and were not significantly different between the two suture groups. Wound healing characteristics were also comparable. The incidence of adverse events was 13.6%, although none were deemed attributable to the suture, and no difference was observed between the two groups. Conclusions NEOSORB® Plus is not inferior to traditional sutures in terms of intraoperative handling and wound healing, potentially making NEOSORB® Plus a beneficial alternative for patients at increased risk of SSI. Trial registration ClinicalTrials.gov: NCT02431039. Trial registration date 14 August 2015. Electronic supplementary material The online version of this article (10.1186/s12893-018-0377-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bum Sik Tae
- Department of Urology, Korea University Ansan Hospital, Ansan, South Korea
| | - Ju Hyun Park
- Department of Urology, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul National University Hospital, Seoul, South Korea
| | - Jung Kwon Kim
- Department of Urology, Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Ja Hyeon Ku
- Department of Urology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, South Korea
| | - Cheol Kwak
- Department of Urology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, South Korea
| | - Hyeon Hoe Kim
- Department of Urology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, South Korea
| | - Chang Wook Jeong
- Department of Urology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 110-744, South Korea.
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Louzao I, Koch B, Taresco V, Ruiz-Cantu L, Irvine DJ, Roberts CJ, Tuck C, Alexander C, Hague R, Wildman R, Alexander MR. Identification of Novel "Inks" for 3D Printing Using High-Throughput Screening: Bioresorbable Photocurable Polymers for Controlled Drug Delivery. ACS APPLIED MATERIALS & INTERFACES 2018; 10:6841-6848. [PMID: 29322768 DOI: 10.1021/acsami.7b15677] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A robust methodology is presented to identify novel biomaterials suitable for three-dimensional (3D) printing. Currently, the application of additive manufacturing is limited by the availability of functional inks, especially in the area of biomaterials; this is the first time when this method is used to tackle this problem, allowing hundreds of formulations to be readily assessed. Several functional properties, including the release of an antidepressive drug (paroxetine), cytotoxicity, and printability, are screened for 253 new ink formulations in a high-throughput format as well as mechanical properties. The selected candidates with the desirable properties are successfully scaled up using 3D printing into a range of object architectures. A full drug release study and degradability and tensile modulus experiments are presented on a simple architecture to validating the suitability of this methodology to identify printable inks for 3D printing devices with bespoke properties.
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Affiliation(s)
- Iria Louzao
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Britta Koch
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Vincenzo Taresco
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Laura Ruiz-Cantu
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Derek J Irvine
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Clive J Roberts
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Christopher Tuck
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Cameron Alexander
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Richard Hague
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Ricky Wildman
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
| | - Morgan R Alexander
- School of Pharmacy and ‡Faculty of Engineering, University of Nottingham , Nottingham NG7 2RD, U.K
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Nagai K, Domon H, Oda M, Shirai T, Ohsumi T, Terao Y, Arai Y. Antimicrobial activity of ethylene-vinyl acetate containing bioactive filler against oral bacteria. Dent Mater J 2017; 36:784-790. [PMID: 28747597 DOI: 10.4012/dmj.2016-321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We developed an ethylene vinyl acetate (EVA) containing surface pre-reacted glass-ionomer (S-PRG) filler, as a new mouthguard material for preventing intraoral bacterial infection. We examined its physical properties, antimicrobial activity against a major cariogenic bacterium Streptococcus mutans and a periodontopathogen Porphyromonas gingivalis, and its cytotoxicity toward human gingival epithelial cells. S-PRG filler was added to EVA copolymer at 5, 10, 20, or 40 wt% and was processed into disc-shaped test specimens. Only minor differences between the Shore hardness and rebound resilience properties of EVA materials with and without the S-PRG filler were observed. The specimens with S-PRG filler showed bacteriostatic activity toward S. mutans and P. gingivalis and inhibited S. mutans biofilm formation. No cytotoxicity against the gingival epithelial cells was observed. Our findings show that EVA containing S-PRG filler has antimicrobial activity toward pathogenic oral bacteria and may be an effective material for maintaining the oral health of athletes.
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Affiliation(s)
- Kosuke Nagai
- Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital.,Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences
| | - Hisanori Domon
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences
| | - Masataka Oda
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences
| | - Tomoe Shirai
- Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital
| | - Tatsuya Ohsumi
- Division of Cariology, Operative Dentistry and Endodontics, Department of Oral Health Science, Niigata University Graduate School of Medical and Dental Sciences
| | - Yutaka Terao
- Division of Microbiology and Infectious Diseases, Niigata University Graduate School of Medical and Dental Sciences
| | - Yoshiaki Arai
- Temporomandibular Joint Clinic, Niigata University Medical and Dental Hospital
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Ximenes M, Cardoso M, Astorga F, Arnold R, Pimenta LA, Viera RDS. Antimicrobial activity of ozone and NaF-chlorhexidine on early childhood caries. Braz Oral Res 2017; 31:e2. [PMID: 28076495 DOI: 10.1590/1807-3107bor-2017.vol31.0002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 11/14/2016] [Indexed: 11/22/2022] Open
Abstract
An early childhood carie (ECC) is an extremely destructive form of tooth decay. The aim of this study was to investigate the action of ozone (O3), and the association of sodium fluoride (NaF) with chlorhexidine (CHX) on bacteria related to ECC. Overnight culture of the bacteria was performed. On exponential phase the suspension was adjusted (101-108 CFU/mL). A drop (10μL) of each concentration of bacteria was applied on sheep blood agar plates and treated with O3 (2, 20, 200, and 2,000 ppm); after 18 hours, recovery analysis of CFU verified the reduction of bacterial activity. For NaF-CHX, sterile 96-well plates were prepared and divided into groups: G1 (150 µL TSB); G2 (20 µL of bacteria + 25 µL CHX + 25 µL NaF); and G3 (150 µL TSB + 20 µL of bacteria + 50 µL water). The plates were verified by analysis of the optical density (0, 12, 14, 16, and 18 hours). The data from O3 test were submitted to ANOVA and Tukey's test (p < 0.05). For the data from NaF-CHX, the ANOVA 2-way and Bonferroni's test (p < 0.05) were used. The number of CFU/mL showed death > 3log10 (99.9%) for all bacteria (ozone ≥ 20ppm), while the combination of NaF-CHX was more effective (p < 0.001) compared to each substance tested alone and the control group. The antimicrobial agents tested were able to inhibit all bacteria tested; O3 seemed to be a good alternative for controlling progression of carious lesions, while the association of NaF-CHX showed to be a good antimicrobial with easy and inexpensive application.
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Affiliation(s)
- Marcos Ximenes
- Universidade Federal de Santa Catarina - UFSC, Dental School, Department of Pediatric Dentistry, Florianópolis, SC, Brazil
| | - Mariane Cardoso
- Universidade Federal de Santa Catarina - UFSC, Dental School, Department of Pediatric Dentistry, Florianópolis, SC, Brazil
| | - Fernando Astorga
- University of Colorado - UC, Dental School of Dental Medicine, Department of Restorative Dentistry, Denver, CO, USA
| | - Roland Arnold
- University of North Carolina - UNC, School of Dentistry, Deparment of Dental Research, Chapel Hill, NC, USA
| | - Luiz André Pimenta
- University of North Carolina - UNC, School of Dentistry, Deparment of Dental Ecology, Chapel Hill, NC, USA
| | - Ricardo de Sousa Viera
- Universidade Federal de Santa Catarina - UFSC, Dental School, Department of Pediatric Dentistry, Florianópolis, SC, Brazil
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Paradinha MM, Gonzalez Dias FT, Wanke CH, de Lima Novello JC, Tondo EC, De Nardi Martins J, Bianchi O. Preparation and characterization of the ethylene-vinyl acetate copolymer partially hydrolyzed assisted by microwave radiation. J Appl Polym Sci 2016. [DOI: 10.1002/app.44558] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Matheus Moresco Paradinha
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais-PGMAT; Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul 95070560 Brazil
| | - Fernanda Trindade Gonzalez Dias
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais-PGMAT; Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul 95070560 Brazil
| | - Cesar Henrique Wanke
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais-PGMAT; Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul 95070560 Brazil
| | - Júnia Capua de Lima Novello
- Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul Brazil
- Universidade Federal do Rio Grande do Sul, ICTA; Porto Alegre Rio Grande do Sul Brazil
| | - Eduardo Cesar Tondo
- Universidade Federal do Rio Grande do Sul, ICTA; Porto Alegre Rio Grande do Sul Brazil
| | | | - Otávio Bianchi
- Programa de Pós-Graduação em Engenharia e Ciência dos Materiais-PGMAT; Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul 95070560 Brazil
- Programa de Pós-Graduação em Ciências da Saúde; Universidade de Caxias do Sul; Caxias do Sul Rio Grande do Sul 95070560 Brazil
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Gonçalves F, Correia P, Silva SP, Almeida-Aguiar C. Evaluation of antimicrobial properties of cork. FEMS Microbiol Lett 2015; 363:fnv231. [PMID: 26635416 DOI: 10.1093/femsle/fnv231] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/19/2015] [Indexed: 12/21/2022] Open
Abstract
Cork presents a range of diverse and versatile properties making this material suitable for several and extremely diverse industrial applications. Despite the wide uses of cork, its antimicrobial properties and potential applications have deserved little attention from industry and the scientific community. Thus, the main purpose of this work was the evaluation of the antibacterial properties of cork, by comparison with commercially available antimicrobial materials (Ethylene-Vinyl Acetate copolymer and a currently used antimicrobial commercial additive (ACA)), following the previous development and optimization of a method for such antimicrobial assay. The AATCC 100-2004 standard method, a quantitative procedure developed for the assessment of antimicrobial properties in textile materials, was used as reference and optimized to assess cork antibacterial activity. Cork displayed high antibacterial activity against Staphylococcus aureus, with a bacterial reduction of almost 100% (96.93%) after 90 minutes of incubation, similar to the one obtained with ACA. A more reduced but time-constant antibacterial action was observed against Escherichia coli (36% reduction of the initial number of bacterial colonies). To complement this study, antibacterial activity was further evaluated for a water extract of cork and an MIC of 6 mg mL(-1) was obtained against the reference strain S. aureus.
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Affiliation(s)
- Filipa Gonçalves
- CBMA - Centre of Molecular and Environmental Biology, Department of Biology, University of Minho, 4710-057 Braga, Portugal
| | - Patrícia Correia
- Amorim Cork Research and Services, 4535-907 S. Paio Oleiros, Portugal
| | - Susana P Silva
- Amorim Cork Research and Services, 4535-907 S. Paio Oleiros, Portugal
| | - Cristina Almeida-Aguiar
- CITAB, Centre for the Research and Technology of Agro-Environmental and Biological Sciences, University of Minho, 4710-057 Braga, Portugal Department of Biology, School of Sciences, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Soriano-Souza CA, Rossi AL, Mavropoulos E, Hausen MA, Tanaka MN, Calasans-Maia MD, Granjeiro JM, Rocha-Leão MHM, Rossi AM. Chlorhexidine-loaded hydroxyapatite microspheres as an antimicrobial delivery system and its effect on in vivo osteo-conductive properties. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:166. [PMID: 25791461 DOI: 10.1007/s10856-015-5505-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 02/09/2015] [Indexed: 06/04/2023]
Abstract
Hydroxyapatite (HA) has been investigated as a delivery system for antimicrobial and antibacterial agents to simultaneously stimulate bone regeneration and prevent infection. Despite evidence supporting the bactericidal efficiency of these HA carriers, few studies have focused on the effect of this association on bone regeneration. In this work, we evaluated the physico-chemical properties of hydroxyapatite microspheres loaded with chlorhexidine (CHX) at two different concentrations, 0.9 and 9.1 μgCHX/cm2 HA, and characterized their effects on in vitro osteoblast viability and bone regeneration. Ultraviolet-visible spectroscopy, scanning and transmission electron microscopy associated with energy-dispersive X-ray spectroscopy and electron energy loss spectroscopy were used to characterize the association of CHX and HA nanoparticles. The high CHX loading dose induced formation of organic CHX plate-like aggregates on the HA surface, whereas a Langmuir film was formed at the low CHX surface concentration. Quantitative evaluation of murine osteoblast viability parameters, including adhesion, mitochondrial activity and membrane integrity of cells exposed to HA/CHX extracts, revealed a cytotoxic effect for both loading concentrations. Histomorphological analysis upon implantation into the dorsal connective tissues and calvaria of rats for 7 and 42 days showed that the high CHX concentration induced the infiltration of inflammatory cells, resulting in retarded bone growth. Despite a strong decrease in in vitro cell viability, the low CHX loading dose did not impair the biocompatibility and osteoconductivity of HA during bone repair. These results indicate that high antimicrobial doses may activate a strong local inflammatory response and disrupt the long-term osteoconductive properties of CHX-HA delivery systems.
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Affiliation(s)
- Carlos Alberto Soriano-Souza
- Department of Applied Physics, Brazilian Center for Physics Research, Rua Dr. Xavier Sigaud, 150, Lab 203, Urca, 22290-180, Rio de Janeiro, RJ, Brazil,
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Wood NJ, Maddocks SE, Grady HJ, Collins AM, Barbour ME. Functionalization of ethylene vinyl acetate with antimicrobial chlorhexidine hexametaphosphate nanoparticles. Int J Nanomedicine 2014; 9:4145-52. [PMID: 25206305 PMCID: PMC4157624 DOI: 10.2147/ijn.s65343] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Ethylene vinyl acetate (EVA) is in widespread use as a polymeric biomaterial with diverse applications such as intravitreal devices, catheters, artificial organs, and mouthguards. Many biomaterials are inherently prone to bacterial colonization, as the human body is host to a vast array of microbes. This can lead to infection at the biomaterial’s site of implantation or application. In this study, EVA was coated with chlorhexidine (CHX) hexametaphosphate (HMP) nanoparticles (NPs) precipitated using two different reagent concentrations: CHX-HMP-5 (5 mM CHX and HMP) and CHX-HMP-0.5 (0.5 mM CHX and HMP). Data gathered using dynamic light scattering, transmission electron microscopy, and atomic force microscopy indicated that the NPs were polydisperse, ~40–80 nm in diameter, and aggregated in solution to form clusters of ~140–200 nm and some much larger aggregates of 4–5 μM. CHX-HMP-5 formed large deposits on the polymer surface discernible using scanning electron microscopy, whereas CHX-HMP-0.5 did not. Soluble CHX was released by CHX-HMP-5 NP-coated surfaces over the experimental period of 56 days. CHX-HMP-5 NPs prevented growth of methicillin-resistant Staphylococcus aureus when applied to the polymer surfaces, and also inhibited or prevented growth of Pseudomonas aeruginosa with greater efficacy when the NP suspension was not rinsed from the polymer surface, providing a greater NP coverage. This approach may provide a useful means to treat medical devices fabricated from EVA to render them resistant to colonization by pathogenic microorganisms.
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Affiliation(s)
- Natalie J Wood
- Oral Nanoscience, School of Oral and Dental Sciences, University of Bristol, UK ; Bristol Centre for Functional Nanomaterials, University of Bristol, UK ; Centre for Organised Matter Chemistry, School of Chemistry, University of Bristol, UK
| | | | - Helena J Grady
- Oral Nanoscience, School of Oral and Dental Sciences, University of Bristol, UK ; Bristol Centre for Functional Nanomaterials, University of Bristol, UK
| | - Andrew M Collins
- Bristol Centre for Functional Nanomaterials, University of Bristol, UK
| | - Michele E Barbour
- Oral Nanoscience, School of Oral and Dental Sciences, University of Bristol, UK
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D’Ercole S, Martinelli D, Tripodi D. Influence of sport mouthguards on the ecological factors of the children oral cavity. BMC Oral Health 2014; 14:97. [PMID: 25091394 PMCID: PMC4146445 DOI: 10.1186/1472-6831-14-97] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2014] [Accepted: 07/25/2014] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND The use of fixed and/or removable dental devices is an attributable factor that may affect the oral cavity homeostasis. The aim of this study was to monitor the oral environmental changes caused by dental devices, as sports mouthguards with the aid of a chair-side test. METHODS Sixty children with sports-mouthguards were analyzed at baseline (T0), after 6 months of dental devices use (T1), after a year (T2) and after almost 6 months without using it (T3). At T0, a clinical monitoring was performed and the DMFT index was recorded. At each time of observation, the following parameters were recorded: FMPS, FMBS, unstimulated-flow rate, saliva consistency, resting pH, stimulated saliva, buffer capacity, the CFU/ml of Streptococcus mutans. RESULTS In 60 subjects, mean age 9.9 ± 1.2, mean value of DMFT 1.55 ± 1.29,dmf-t 3.43 ± 1.21, FMPS and FMBS values increased significantly at T2. The values of unstimulated flow rate vary significantly within the observation times. The pH value and the buffering capacity reduced significantly at T2. The tests for the detection of S. mutans were negative in all the subjects in several observation times. All patients regularly used fluoridated toothpaste and comply with normal standards of oral hygiene; but over time the patients lost their initial motivation. CONCLUSIONS Sport treatment with dental devices dues to changes in oral ecological factors: increases FMPS, FMBS and reduces the buffering capacity and the salivary pH. The use of removable devices increases the retentive plaque surfaces and inhibits the protective effect of saliva.The so-called "chair-side" tests were able to easily monitor patients and to determine the risk of oral disease during sport treatment.
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Affiliation(s)
- Simonetta D’Ercole
- Departments of Sperimental and Clinical Sciences, Dental School, University “G. D’Annunzio” of Chieti-Pescara, Chieti, Italy
- Oral Microbiology, Department of Sperimental and Clinical Sciences, University “G. d’Annunzio” Chieti- Pescara, Via dei Vestini, 31 66100 Chieti, Italy
| | - Diego Martinelli
- Departments of Medical, Oral, and Biotechnological Sciences, Dental School, University “G. D’Annunzio” of Chieti-Pescara, Chieti, Italy
| | - Domenico Tripodi
- Unit of Pediatric Dentistry, Departments of Medical, Oral, and Biotechnological Sciences, Dental School, University “G. D’Annunzio” of Chieti-Pescara, Chieti, Italy
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15
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Scaffaro R, Botta L, Sanfilippo M, Gallo G, Palazzolo G, Puglia AM. Combining in the melt physical and biological properties of poly(caprolactone) and chlorhexidine to obtain antimicrobial surgical monofilaments. Appl Microbiol Biotechnol 2012; 97:99-109. [DOI: 10.1007/s00253-012-4283-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 07/02/2012] [Accepted: 07/03/2012] [Indexed: 01/31/2023]
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16
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Study on carvacrol and cinnamaldehyde polymeric films: mechanical properties, release kinetics and antibacterial and antibiofilm activities. Appl Microbiol Biotechnol 2012; 96:1029-38. [DOI: 10.1007/s00253-012-4091-3] [Citation(s) in RCA: 108] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2012] [Revised: 04/04/2012] [Accepted: 04/06/2012] [Indexed: 10/28/2022]
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Steele TWJ, Huang CL, Widjaja E, Boey FYC, Loo JSC, Venkatraman SS. The effect of polyethylene glycol structure on paclitaxel drug release and mechanical properties of PLGA thin films. Acta Biomater 2011; 7:1973-83. [PMID: 21300188 DOI: 10.1016/j.actbio.2011.02.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2010] [Revised: 12/21/2010] [Accepted: 02/02/2011] [Indexed: 01/28/2023]
Abstract
Thin films of poly(lactic acid-co-glycolic acid) (PLGA) incorporating paclitaxel typically have slow release rates of paclitaxel of the order of 1 μg day(-1) cm(-2). For implementation as medical devices a range of zero order release rates (i.e. 1-15 μg day(-1) cm(-2)) is desirable for different tissues and pathologies. Eight and 35 kDa molecular weight polyethylene glycol (PEG) was incorporated at 15%, 25% and 50% weight ratios into PLGA containing 10 wt.% paclitaxel. The mechanical properties were assessed for potential use as medical implants and the rates of release of paclitaxel were quantified as per cent release and the more clinically useful rate of release in μg day(-1) cm(-2). Paclitaxel quantitation was correlated with the release of PEG from PLGA, to further understand its role in paclitaxel/PLGA release modulation. PEG release was found to correlate with paclitaxel release and the level of crystallinity of the PEG in the PLGA film, as measured by Raman spectrometry. This supports the concept of using a phase separating, partitioning compound to increase the release rates of hydrophobic drugs such as paclitaxel from PLGA films, where paclitaxel is normally homogeneously distributed/dissolved. Two formulations are promising for medical device thin films, when optimized for tensile strength, elongation, and drug release. For slow rates of paclitaxel release an average of 3.8 μg day(-1) cm(-2) using 15% 35k PEG for >30 days was achieved, while a high rate of drug release of 12 μg day(-1) cm(-2) was maintained using 25% 8 kDa PEG for up to 12 days.
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Affiliation(s)
- Terry W J Steele
- Nanyang Technological University, Materials and Science Engineering, Division of Materials Technology, Singapore, Singapore
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Tang M, Hou J, Lei L, Liu X, Guo S, Wang Z, Chen K. Preparation, characterization and properties of partially hydrolyzed ethylene vinyl acetate copolymer films for controlled drug release. Int J Pharm 2010; 400:66-73. [DOI: 10.1016/j.ijpharm.2010.08.031] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2010] [Revised: 08/20/2010] [Accepted: 08/24/2010] [Indexed: 10/19/2022]
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Fu Y, Kao WJ. Drug release kinetics and transport mechanisms of non-degradable and degradable polymeric delivery systems. Expert Opin Drug Deliv 2010; 7:429-44. [PMID: 20331353 DOI: 10.1517/17425241003602259] [Citation(s) in RCA: 753] [Impact Index Per Article: 50.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IMPORTANCE OF THE FIELD The advancement in material design and engineering has led to the rapid development of new materials with increasing complexity and functions. Both non-degradable and degradable polymers have found wide applications in the controlled delivery field. Studies on drug release kinetics provide important information into the function of material systems. To elucidate the detailed transport mechanism and the structure-function relationship of a material system, it is critical to bridge the gap between the macroscopic data and the transport behavior at the molecular level. AREAS COVERED IN THIS REVIEW The structure and function information of selected non-degradable and degradable polymers have been collected and summarized from literature published after the 1990s. The release kinetics of selected drug compounds from various material systems is discussed in case studies. Recent progress in the mathematical models based on different transport mechanisms is highlighted. WHAT THE READER WILL GAIN This article aims to provide an overview of structure-function relationships of selected non-degradable and degradable polymers as drug delivery matrices. TAKE HOME MESSAGE Understanding the structure-function relationship of the material system is key to the successful design of a delivery system for a particular application. Moreover, developing complex polymeric matrices requires more robust mathematical models to elucidate the solute transport mechanisms.
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Affiliation(s)
- Yao Fu
- University of Wisconsin-Madison, School of Pharmacy, 777 Highland Avenue, Madison, WI 53705, USA
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Nostro A, Scaffaro R, Ginestra G, D'Arrigo M, Botta L, Marino A, Bisignano G. Control of biofilm formation by poly-ethylene-co-vinyl acetate films incorporating nisin. Appl Microbiol Biotechnol 2010; 87:729-37. [PMID: 20414650 DOI: 10.1007/s00253-010-2598-z] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2010] [Revised: 03/04/2010] [Accepted: 03/31/2010] [Indexed: 01/30/2023]
Abstract
The aim of this study was to evaluate the effect of poly-ethylene-co-vinyl acetate (EVA) films incorporating different concentrations (0.1%, 0.5% and 1%) of nisin on the biofilm-forming ability of Listeria monocytogenes ATCC 7644, Staphylococcus aureus 815 and Staphylococcus epidermidis ATCC 35984. Nisin was incorporated into two grades of EVA (EVA14 and EVA28) in the melt during a common film-blowing operation. The efficacy of EVA/nisin films was evaluated by biofilm biomass measurements and Live/Dead staining in combination with fluorescence microscopy. In order to evaluate whether the nisin incorporation could modify the film surface properties, contact angle measurements and scanning electron microscopy were performed. The results revealed the efficacy of EVA14/nisin films in reducing biofilm formation on their surfaces with more evident effect for S. epidermidis than L. monocytogenes and S. aureus strains. In contrast, EVA28/nisin films showed unsatisfactory activity. Fluorescence microscopy confirmed poor biofilm formation on EVA14/nisin films, also characterised by the presence of dead cells. The data presented in this study offer new potential applications for developing strategies aimed to improve the effect of antimicrobial agents.
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Affiliation(s)
- Antonia Nostro
- Pharmaco-Biological Department, University of Messina, Viale Annunziata, 98100, Messina, Italy.
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