Preparation and Characterization of PLA/Polypyrrole Blends with Antibacterial Properties (original) (raw)
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The development of polypyrrole-based nanocomposites as alternative antibacterial agents represents a promising strategy to be applied against the prevailing multi-resistant bacteria. Herein, it is reported the most recent development of antibacterial materials based on the combination of polypyrrole and different fillers (metal nanoparticles, carbon nanotubes, and polysaccharides) and strategies to improve their action (such as light and electrical stimulus). The synergistic interaction of electrostatic forces provided by charged polypyrrole combined with the permeation of nanoparticles through the cell wall favors the leakage of cytoplasmic components and reinforces the antibacterial activity of the resulting material, observed in all-organic composites of polypyrrole and chitosan that reached superior performance against Escherichia coli (10 8 CFU) or metal-polymer composites (polypyrrole-palladium) with an outstanding performance against different types of bacteria. The development of binary and ternary composites is explored to potentialize the antibacterial synergy of components.
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LWT - Food Science and Technology, 2015
Bio-based films formed by poly(lactic acid) (PLA) and poly(3-hydroxybutyrate) (PHB) plasticized with an oligomer of the lactic acid (OLA) were used as supporting matrices for an antibacterial agent (carvacrol). This paper reports the main features of the processing and physico-chemical characterization of these innovative biodegradable material based films, which were extruded and further submitted to filmature process. The effect of the addition of carvacrol and OLA on their microstructure, chemical, thermal and mechanical properties was assessed. The presence of these additives did not affect the thermal stability of PLA_PHB films, but resulted in a decrease in their crystallinity and in the elastic modulus for the active formulations. The obtained results showed the
Background: Reduction the risk of pathogen diffusion and severe diseases, need for antibacterial surface has been urgent. Antimicrobial polymer cab be defined as polymers with antimicrobial activity, or have the ability to prevent the growth of microorganisms such as bacteria, fungi or protozoans. Typically, this type of polymers are produced by inserting or attaching an active antimicrobial agents onto the backbone of polymer via an alkyl or acetyl linker, therefore; this material can be candidate to be used in medical areas as tools to fight infection, more over in the food industry to inhibit bacterial contamination, and in water purification to inhibit microorganisms growth in drinking water. Objective: In this work, it has been employed two methods for improvement antibacterial of poly methyl methacrylate (PMMA), high-density polyethylene (HDPE) and ultra-high molecular weight polyethylene (UHMWPE) using both blending technique and reinforcement with 1.5wt.% of Nano powders (zirconia and hydroxyapatite). Samples tested against two types of bacteria positive gram staphylococcus and negative gram pseudomonas to assay the efficiency as antibacterial. Results:Results showed that blending technique strongly discourages growth of bacteria colonies; the same result was in polymer blends composites reinforced with zirconia and hydroxyapatite, except in case of PMMA-UHMWPE blend at which the effect of antigrowth was negative. Results of CFU of polymer blends composites showed improvement of the antibacterial with the addition of 1.5 wt. % of zirconia and Hydroxyapatite nanoparticles. Scanning electron microscope of polymer blends shows two different systems, homogenous and heterogeneous at which two distinct phases exist, a continuous PMMA matrix and dispersed globules of the second polymer phase, but with some discontinuous phase structure or so called " phase inversion ". SEM of blends Nano composites showed that the dispersion of ZrO2 and HAp nanoparticles was relatively good and uniformly throughout the entire polymer blend at low ratio of concentrations, but the opposite occurs at high weight ratios(i.e.1.5wt%). Conclusion:The positive effect of blending polymers on prevent the growth of colonies and the addition of both reinforcements that indicate to good compatibility between fillers and polymer blend matrix.
Staphylococcus aureus Biofilm Formation on Polypyrrole: an Electrical Overview
The development of organic devices based on conducting polymers for biofilm detection requires the combination of superior electrical response and high surface area for biofilm incorporation. Polypyrrole is a potential candidate for application in biofilm detection and control due to its characteristic superior electrical response and strong interaction with bacteria, which enables the use of the bioelectric effect in resulting devices. In this study, chemically synthesized polypyrrole was applied as a support for biofilm growth of S. aureus. Modifications in the electrical response of the polymeric template were explored to identify general mechanisms established during the deposition of the biofilm
Polymeric Materials with Antibacterial Activity: A Review
Polymers, 2021
Infections caused by bacteria are one of the main causes of mortality in hospitals all over the world. Bacteria can grow on many different surfaces and when this occurs, and bacteria colonize a surface, biofilms are formed. In this context, one of the main concerns is biofilm formation on medical devices such as urinary catheters, cardiac valves, pacemakers or prothesis. The development of bacteria also occurs on materials used for food packaging, wearable electronics or the textile industry. In all these applications polymeric materials are usually present. Research and development of polymer-based antibacterial materials is crucial to avoid the proliferation of bacteria. In this paper, we present a review about polymeric materials with antibacterial materials. The main strategies to produce materials with antibacterial properties are presented, for instance, the incorporation of inorganic particles, micro or nanostructuration of the surfaces and antifouling strategies are consider...
Iraqi Journal of Physics, 2021
Polypyrrole/silver (PPy/Ag) nanocomposites was synthesized via a chemical oxidative method. The AFM analysis is performed to study the surface roughness, morphology and size distribution of the PPy particles and PPy-ag nanocomposites. The results indicated that as the concentration of Ag in the nanocomposite increases, the roughness also increases. The size of nanoparticles was also evaluated and found in the range of 15 nm to 125 nm. The PPy/Ag nanocomposites exhibited an effectiveness against Gram-negative Escherichia coli showing an inhibition zone of 4mm and displayed poor efficacy against Gram-positive Staphylococcus aureus. Based on given adequate antibacterial characteristics of PPy/Ag nanocomposites, it can be identified as a promising material in biomedical applications.
Antibacterial Properties of Poly(N-Vinylpyrrolidone-co-Acrylic Acid)/ Diethylaminoethanol Ester
Copolymer of N-vinylpyrrolidone (NVP) and Acrylic acid (AA) was prepared by using hydrogen peroxide as initiator in Tetrahydrofuran medium at 45 o C under inert atmosphere. Synthesized copolymer was characterized by FTIR, H 1 NMR and C 13 NMR. Copolymer was grafted with N-diethylaminoethanol through Acrylic acid group to form an ester. The antibacterial properties of copolymer and its graft was investigated against four bacterial strains i.e., Gram-ve Klebsiella aerogenes NCIM-2098, Pseudomonas desmolyticum NCIM-2028, and Escherichia coli NCIM-5051 and Gram +ve bacteria like Staphylococcus aureus NCIM-5022. At 150 µg of copolymer dose antibacterial activity was screened in agar media by well diffusion method. All the four bacterial pathogens exhibited significant antibacterial activity in agar well diffusion method when compared with the positive control.
1996
The conductivity, thermal, mechanical and electrochemical properties of poly(vinyl chloride)/polypyrrole blends are described in this paper. These blends were prepared by oxidative chemical polymerization of pyrrole, in the vapour phase, in PVC films impregnated with FeC13. They were characterized by attenuated total reflectance FTi.r. spectra, differential scanning calorimetry and dynamic-mechanical analysis. Infrared reflectance spectra suggested that the polymerization occurs preferentially on the matrix surface producing sandwich-type structures. The mechanical, thermal and conducting behaviour showed a dependence on (1) initial concentration of FeC13 in the matrix and (2) exposition time to pyrrole vapour. By cyclic voltammetry we observe that blends synthesized by oxidative chemical polymerization show electrochemical 4 properties similar to blends prepared by electrochemical methods. Their conductivity varies fi'om 10-to 10-1S cm -1 . Dynamic-mechanical analysis results suggest a certain degree of miscibility among the polymeric components of the blend.
High-performance Engineered Conducting Polymer Film towards Antimicrobial/Anticorrosion Applications
Engineered Science
The goal of this study was to develop a multifunctional coating material that possessed both electrical and antimicrobial properties. Polypyrrole (PPy) has proved to be transformed into N-halamine after its treatment with chlorine bleach. This PPy based N-halamine was tested to have superior antimicrobial efficacy. Its coating inactivated more than 6 log CFU of both Staphylococcus aureus and Escherichia coli O157:H7 within one min of contact time. The stability of PPy based N-halamine was excellent, maintaining 50% of functional groups after a week storage under fluorescent light. PPy N-halamine coating was successfully synthesized by chlorination of electrodeposited PPy coating on the surface of stainless steel. This PPy N-halamine coating on stainless steel inactivated 6 log CFU of S. aureus within 60s of contact and the antimicrobial activity remained unchanged after a "recharge" cycle. In addition, the PPy N-halamine coating significantly enhanced its the anticorrosion functionality by anodically shifting the corrosion potential. This method of preparing antimicrobial/anticorrosion coating is facile, green and highly effective. The produced PPy N-halamine showed great potential to be applied as multifunctional coating for protecting steels in harsh environments.