Cellulose nanocrystals as templates for cetyltrimethylammonium bromide mediated synthesis of Ag nanoparticles and their novel use in PLA films

Yalçınkaya, Esra Evrim; Puglia, Debora; Fortunati, Elena; Bertoglio, Federico; Bruni, Giovanna; Visai, Livia

doi:10.1016/j.carbpol.2016.11.038

Cited by 42 publications

(20 citation statements)

References 40 publications

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“…Furthermore, control wells of TCP were used as positive and sterility control. At the end of the culturing period, the bacterial viability was assayed through the quantitative 3-[4,5-dimethylthiazol-2-yl]-2,5diphenyltetrazoliumbromide (MTT) (Sigma Aldrich, St. Louis, MO, USA) test [32,33]. 5 mg/mL of MTT solution, dissolved in PBS, was used as stock solution and the working concentration was 0.5 mg/mL.…”

Section: Antibacterial Testsmentioning

confidence: 99%

“…SEM images of S. aureus grown on TPU films were prepared essentially as already reported [33]. Briefly, bacteria were incubated on sterile neat and composite TPU film for 24 h at 37 • C. Following incubation, samples were washed carefully with PBS and fixed with 2.5% (v/v) glutaraldehyde in 0.1 M Na-cacodylate buffer (pH 7.2), for 1 h at 4 • C. After additional washing with cacodylate buffer to remove the excess of glutaraldehyde, the samples were dehydrated using increasing concentrations of ethanol (25, 50, 75%) for 5 min and final two washes of 10 min in 96% ethanol.…”

Section: Antibacterial Testsmentioning

confidence: 99%

“…SEM images of S. aureus grown on TPU films were prepared essentially as already reported [33]. Briefly, bacteria were incubated on sterile neat and composite TPU film for 24 h at 37 °C.…”

Section: Preparation Molecular and Structural Characteristicsmentioning

confidence: 99%

“…Antibiotics and contact-killing agents, on the other hand, affect the cell membrane and/or inhibit some metabolic steps, antifouling fillers hamper the adhesion of bacteria on the surfaces preventing the formation of biofilms [1,3,4,[6][7][8][9][10][11][23][24][25][26][27][28][29][30][31][32][33]. Generally, they are made of hydrophilic materials or polyzwitterions which are able to minimize the formation of conditioning films via the formation of a hydration layer.…”

Section: Introductionmentioning

confidence: 99%

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Polyurethane-Based Composites: Effects of Antibacterial Fillers on the Physical-Mechanical Behavior of Thermoplastic Polyurethanes

et al. 2020

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The challenge to manufacture medical devices with specific antibacterial functions, and the growing demand for systems able to limit bacterial resistance growth, necessitates the development of new technologies which can be easily produced at an industrial level. The object of this work was the study and the development of silver, titanium dioxide, and chitosan composites for the realization and/or implementation of biomedical devices. Thermoplastic elastomeric polyurethane was selected and used as matrix for the various antibacterial functions introduced during the processing phase (melt compounding). This strategy was employed to directly incorporate antimicrobial agents into the main constituent material of the devices themselves. With the exception of the composite filled with titanium dioxide, all of the other tested composites were shown to possess satisfactory mechanical properties. The best antibacterial effects were obtained with all the composites against Staphylococcus aureus: viability was efficiently inhibited by the prepared materials in four different bacterial culture concentrations.

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Section: Antibacterial Testsmentioning

confidence: 99%

Section: Antibacterial Testsmentioning

confidence: 99%

“…SEM images of S. aureus grown on TPU films were prepared essentially as already reported [33]. Briefly, bacteria were incubated on sterile neat and composite TPU film for 24 h at 37 °C.…”

Section: Preparation Molecular and Structural Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polyurethane-Based Composites: Effects of Antibacterial Fillers on the Physical-Mechanical Behavior of Thermoplastic Polyurethanes

et al. 2020

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“…This occurs as a result of the presence of reactive oxygen species (ROS) and metal ions when such nanoparticles are in contact with water . Move rover, such metal oxide nanoparticles are becoming popular reinforcing elements as they are cheap, widely available, and they provide good physicochemical and catalytic properties to their hosting matrices …”

Section: Introductionmentioning

confidence: 99%

Hydrolysis of poly(l‐lactide)/ZnO nanocomposites with antimicrobial activity

Pérez‐Álvarez

Lizundia

Ruiz‐Rubio

et al. 2019

J of Applied Polymer Sci

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This work investigates the effect of the incorporation of zinc oxide (ZnO) nanoparticles within a poly(L-lactic acid) (PLLA) matrix as an approach to speed up the hydrolysis of PLLA film surfaces. Hydrolysis was done by immersing nanocomposite films having 1 wt % of ZnO in 0.25 M sodium hydroxide at 58 C. This concentration has been selected as it provides the maximum changes of physicochemical properties of hosting PLLA matrix. The evolution of the thermal properties, ultraviolet-visible transparency, wettability, and morphology were monitored at different time points. The amount of carboxylic groups onto PLLA/ZnO surfaces was quantified according to Toludine Blue-O assay. Hydrolysis was mainly limited to film surfaces, which were grafted by carboxylic groups as a result of the random scission of PLLA ester linkages. The presence of such functional groups decreases the inherent surface hydrophobicity of PLLA at short hydrolysis times. On the contrary, long hydrolyses increase the hydrophobicity as a result of surface nanostructuring induced by the degradation of PLLA to water-soluble oligomers. Overall, ZnO nanoparticles enable shorter surface modification times and provide a quick approach for the modification on the polarity of polylactide surfaces. The potential of hydrolyzed films as antimicrobial materials was explored using Gram-negative Escherichia coli as a model. Accordingly, materials used for packaging applications should be transparent in the visible region at the same time that they display a good degradability, proper mechanical performance, low toxicity, environmentally benign characteristics, ultraviolet (UV)-shielding properties, antibacterial activity, and cost competitive characteristics. Polylactides (PLAs) fulfill the majority of those requirements and they represent one of the most remarkable examples of biopolymers able to replace petroleum-based materials. [1][2][3][4] PLAs are linear aliphatic polyesters that could be obtained from 100% renewable Additional Supporting Information may be found in the online version of this article.

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