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Advances in Skin & Wound Care May 2023Cutaneous foreign bodies are a well-known cause of delayed wound healing and complications such as abscesses, fistula formation, and secondary infections. Polypropylene...
Cutaneous foreign bodies are a well-known cause of delayed wound healing and complications such as abscesses, fistula formation, and secondary infections. Polypropylene sutures are widely utilized in cutaneous surgery because they easily travel through tissues while eliciting minimal tissue reactions. Despite these advantages, retained polypropylene sutures can cause complications. The authors report a case of a retained polypropylene suture that remained buried after a total excision 3 years prior. It started to cause cutaneous symptoms when the patient began exercising 1 week prior to presentation. The authors also examine the dermatoscopic and dermatopathologic features and other complications related to retained polypropylene sutures that have been reported in the literature.
Topics: Humans; Child, Preschool; Polypropylenes; Sutures; Skin; Dermatologic Surgical Procedures; Fistula
PubMed: 37079795
DOI: 10.1097/01.ASW.0000923092.57459.7a -
Environmental Science and Pollution... Oct 2023Microplastics and perfluorooctanoic acid coexist in the aquatic environment. Duckweed was exposed to a range of concentrations (0.1-1000 μg L) of solutions containing...
Microplastics and perfluorooctanoic acid coexist in the aquatic environment. Duckweed was exposed to a range of concentrations (0.1-1000 μg L) of solutions containing polypropylene (PP) and perfluorooctanoic acid (PFOA) for 14 days to measure their toxicity. The result showed the single and combined PP and PFOA treatments did not significantly influence the growth of duckweed. The greatest PP and PFOA concentrations of combined pollution affect plant chlorophyll. Moreover, the combined treatment of duckweed consistently resulted in increased malondialdehyde (MDA) levels, indicating oxidative damage. As an antioxidant stress response, the combination-treated plants were encouraged to produce superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT). Meanwhile, 3519 Operational Taxonomic Units (OTUs) were identified in the duckweed rhizosphere. Proteobacteria was the most predominant microbial community. Shannon, Simpson, and Chao1 discovered that microbial communities changed in response to single and combination PP and PFOA treatments, with decreased diversity and increased abundance. In addition, SEM analysis also revealed that the combined treatment significantly phyllosphere microorganisms. The findings of this investigation add to our knowledge of how PP and PFOA affect duckweed and the rhizospheric microorganisms, expanding the theoretical basis for employing duckweed in complex contamination.
Topics: Polypropylenes; Plastics; Antioxidants; Araceae
PubMed: 37752396
DOI: 10.1007/s11356-023-30006-9 -
Journal of Materials Chemistry. B Jun 2023In this study, we examined the modification of polypropylene non-woven fabrics (PP NWFs) a one-step oxidation treatment using photo-activated chlorine dioxide radicals...
In this study, we examined the modification of polypropylene non-woven fabrics (PP NWFs) a one-step oxidation treatment using photo-activated chlorine dioxide radicals (ClO˙). The oxidised PP NWFs exhibited excellent antibacterial activity against both (Gram-negative) and (Gram-positive). The mound structure and antibacterial activity in the modified PP NWFs disappeared upon washing with a polar organic solvent. After washing, nanoparticles of around 80 nm in diameter were observed in the solution. The results of several mechanistic studies suggest that nanoparticles can contribute to the antimicrobial activity of oxidised PP NWFs.
Topics: Polypropylenes; Textiles; Oxides; Anti-Bacterial Agents
PubMed: 37221892
DOI: 10.1039/d3tb00586k -
Journal of the Science of Food and... Feb 2023EU policies towards a circular economy address plastic packaging as one of the significant concerns and sets ambitious recycling targets. Polyolefins (POs) cannot be...
Recycling of polypropylene by supercritical carbon dioxide for extraction of contaminants from beverage cups. A comparison with polyethylene terephthalate and polylactic acid.
BACKGROUND
EU policies towards a circular economy address plastic packaging as one of the significant concerns and sets ambitious recycling targets. Polyolefins (POs) cannot be recycled for food contact using conventional polyethylene terephthalate (PET) recycling approaches. Thermal degradation prevents the use of high temperatures and, consequently, decontamination of POs may be insufficient when using lower temperatures. Polypropylene (PP) beverage cups were decontaminated using supercritical fluid extraction with carbon dioxide (scCO ). Decontamination efficiencies (DEs) of selected markers were determined in challenge tests following European Food Safety Authority guidelines. The effects of time (10-60 min) for PET, polylactic acid (PLA), and PP and temperature (60-80 °C) for PP were studied at constant pressure. The physical properties, sensorial properties, and overall migration of treated scCO PP were analysed and compared with virgin PP.
RESULTS
PP showed the highest average DE, and PET the lowest, for all the surrogates and in all time conditions. A relative increase in the DE with the increase in process time, particularly for PET and to some extent for PLA, was seen. For PP, no significant impact of time and temperature was observed under the conditions tested. The DE of volatile surrogates was higher than that of semi-volatiles. Results indicate that the scCO treatment did not affect the physical and sensorial properties, nor the overall migration of PP, although it contributes to a considerable reduction in extractable n < C24 alkanes.
CONCLUSIONS
Results indicate that scCO can be used to decontaminate post-consumption PP beverage cups with higher DEs than those for PET and PLA, applying mild processing conditions. © 2022 Society of Chemical Industry.
Topics: Polypropylenes; Polyethylene Terephthalates; Carbon Dioxide; Beverages
PubMed: 36085567
DOI: 10.1002/jsfa.12213 -
Biotechnology and Bioengineering Feb 2018Surface functionalization of biological inert polymers (e.g., polypropylene PP; polystyrene PS) with material binding peptides facilitates an efficient immobilization of...
Surface functionalization of biological inert polymers (e.g., polypropylene PP; polystyrene PS) with material binding peptides facilitates an efficient immobilization of enzymes, bioactive peptides or antigens at ambient temperature in water. The developed robust directed evolution protocol enables to tailor polymer binding anchor peptides (PBPs) for efficient binding under application conditions. Key for a successful directed evolution campaign was to develop an epPCR protocol with a very high mutation frequency (60 mutations/kb) to ensure sufficient diversity in PBPs (47 aas LCI: "liquid chromatography peak I"; 44 aas TA2: "Tachystatin A2"). LCI and TA2 were genetically fused to the reporter egfp to quantify peptide binding on PP and PS by fluorescence analysis. The Peptide-Polymer evolution protocol (PePevo protocol) was validated in two directed evolution campaigns for two PBPs and polymers (LCI: PP; TA2: PS). Surfactants were used as selection pressure for improved PBP binders (non-ionic surfactant Triton X-100; 1 mM for LCI-PP // anionic surfactant LAS; 0.5 mM for TA2-PS). PePevo yielded an up to three fold improved PP-binder (LCI-M1-PP: I24T, Y29H, E42 K and LCI-M2-PP: D31V, E42G) and an up to six fold stronger PS-binder (TA2-M1-PS: R3S, L6P, V12 K, S15P, C29R, R30L, F33S, Y44H and TA2-M2-PS: F9C, C24S, G26D, S31G, C41S, Y44Q).
Topics: Directed Molecular Evolution; Escherichia coli; Peptides; Polypropylenes; Polystyrenes; Protein Binding; Recombinant Fusion Proteins; Surface Properties
PubMed: 29064564
DOI: 10.1002/bit.26481 -
Materials Science & Engineering. C,... Aug 2017The additive manufacturing of small diameter polypropylene microfibers is described, achieved using a technique termed melt electrospinning writing. Sequential fiber...
The additive manufacturing of small diameter polypropylene microfibers is described, achieved using a technique termed melt electrospinning writing. Sequential fiber layering, which is important for accurate three-dimensional fabrication, was achieved with the smallest fiber diameter of 16.4±0.2μm obtained. The collector speed, temperature and melt flow rate to the nozzle were optimized for quality and minimal fiber pulsing. Of particular importance to the success of this method is appropriate heating of the collector plate, so that the electrostatically drawn filament adheres during the direct-writing process. By demonstrating the direct-writing of polypropylene, new applications exploiting the favorable mechanical, stability and biocompatible properties of this polymer are envisaged.
Topics: Polyesters; Polypropylenes; Tissue Engineering; Tissue Scaffolds
PubMed: 28532105
DOI: 10.1016/j.msec.2017.03.286 -
Biotechnology and Applied Biochemistry Dec 2023Health and environmental consequences are unavoidable when it comes to management of hospital waste (HW) disposables. In order to eradicate the HW, this study isolated a...
Health and environmental consequences are unavoidable when it comes to management of hospital waste (HW) disposables. In order to eradicate the HW, this study isolated a novel fungus SPF21 from a hospital dumping yard to degrade Polypropylene (PP). We measured the attributes of PP inoculated with fungus using mass loss, Fourier trans-form infrared (FTIR), contact angle (CA), and scanning electron microscopy (SEM). The weight of PP exposed to SPF21 was reduced by 25% in 90 days. The SEM images reveal that there are pores all over the sample surface; they alsocaused voids during the biodegradation of PP. FTIR analysis indicates that the spectra of treated mask pieces show the absence of peak at 1746 cm and the appearance of a new peak at 1643 cm . A period of 90-day exposure to the fungal isolate SPF21 reduced the CA of PP by 44.8% when compared to the nonexposed PP samples, suggesting that the surface of PP turned more hydrophilic after exposure. Moreover, our study on PP degradation by the fungus Ascotricha sinuosa SPF21 appears to be promising from the perspective of environmental, health, and economic hazards. Our results indicate that biodegradation greatly facilitates fungus deposition and changes PP film morphology and hydrophilicity.
Topics: Polypropylenes; Spectroscopy, Fourier Transform Infrared; Microscopy, Electron, Scanning; Biodegradation, Environmental; Fungi
PubMed: 37417692
DOI: 10.1002/bab.2492 -
Anaesthesia Sep 2017
Topics: Ephedrine; Polypropylenes; Syringes
PubMed: 28804879
DOI: 10.1111/anae.14022 -
Journal of Biomedical Materials... Jul 2018We have performed three distinct plasma enhanced chemical vapor deposition procedures that can be widely and consistently used in commercially available plasma systems...
We have performed three distinct plasma enhanced chemical vapor deposition procedures that can be widely and consistently used in commercially available plasma systems to modify the surface of hydrocarbon-based biomaterials such as polypropylene. In particular, we have evaluated the feasibility of these procedures to provide consistent and stable charged substrates to perform layer-by-layer (LbL) coatings. Surface characterization of both plasma and LbL coatings were done using X-ray photoelectron spectroscopy, attenuated total reflection-Fourier transform infrared spectroscopy, contact angle measurements and surface staining. Results showed successful surface grafting of functional groups in all plasma procedures that led to increased hydrophilicity and uniform LbL coatings with different efficiencies. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2078-2085, 2018.
Topics: Allylamine; Maleic Anhydrides; Oxygen; Photoelectron Spectroscopy; Plasma Gases; Polyelectrolytes; Polypropylenes; Surface Properties
PubMed: 29569359
DOI: 10.1002/jbm.a.36405 -
Journal of Biomaterials Science.... Apr 2017Polypropylene (PP) transvaginal mesh (TVM) repair for stress urinary incontinence (SUI) has shown promising short-term objective cure rates. However, life-altering...
Polypropylene (PP) transvaginal mesh (TVM) repair for stress urinary incontinence (SUI) has shown promising short-term objective cure rates. However, life-altering complications have been associated with the placement of PP mesh for SUI repair. PP degradation as a result of the foreign body reaction (FBR) has been proposed as a contributing factor to mesh complications. We hypothesized that PP oxidizes under in vitro conditions simulating the FBR, resulting in degradation of the PP. Three PP mid-urethral slings from two commercial manufacturers were evaluated. Test specimens (n = 6) were incubated in oxidative medium for up to 5 weeks. Oxidation was assessed by Fourier Transform Infrared Spectroscopy (FTIR), and degradation was evaluated by scanning electron microscopy (SEM). FTIR spectra of the slings revealed evidence of carbonyl and hydroxyl peaks after 5 weeks of incubation time, providing evidence of oxidation of PP. SEM images at 5 weeks showed evidence of surface degradation, including pitting and flaking. Thus, oxidation and degradation of PP pelvic mesh were evidenced by chemical and physical changes under simulated in vivo conditions. To assess changes in PP surface chemistry in vivo, fibers were recovered from PP mesh explanted from a single patient without formalin fixation, untreated (n = 5) or scraped (n = 5) to remove tissue, and analyzed by X-ray photoelectron spectroscopy. Mechanical scraping removed adherent tissue, revealing an underlying layer of oxidized PP. These findings underscore the need for further research into the relative contribution of oxidative degradation to complications associated with PP-based TVM devices in larger cohorts of patients.
Topics: Biocompatible Materials; Female; Humans; Materials Testing; Microscopy, Electron, Scanning; Oxidation-Reduction; Photoelectron Spectroscopy; Polypropylenes; Spectroscopy, Fourier Transform Infrared; Surgical Mesh
PubMed: 28081670
DOI: 10.1080/09205063.2017.1279045