Engineering and antibacterial properties of low-density polyethylene films with incorporated epigallocatechin gallate

2017 ◽  
Vol 33 (4) ◽  
pp. 413-437 ◽  
Author(s):  
María J Moreno-Vásquez ◽  
Maribel Plascencia-Jatomea ◽  
Víctor M Ocaño-Higuera ◽  
Francisco J Castillo-Yáñez ◽  
Francisco Rodríguez-Félix ◽  
...  
Keyword(s):  
Culture Media ◽  
Morphological Changes ◽  
Antibacterial Properties ◽  
Epigallocatechin Gallate ◽  
Low Density Polyethylene ◽  
Infrared Analysis ◽  
Low Density ◽  
Pseudomonas Sp ◽  
Film Properties ◽  
Adhesive Resin

The antibacterial activity of low-density polyethylene/adhesive resin (10%)/epigallocatechin gallate (0.03, 0.5, 5, and 10%) extrusion cast films were evaluated against Staphylococcus aureus (gram positive) and Pseudomonas sp. (gram negative) via direct contact and in solid and liquid culture media. The epigallocatechin gallate concentration in the active films was established per the in vitro antibacterial analysis of pure epigallocatechin gallate against S. aureus and Pseudomonas sp. The epigallocatechin gallate migration profile and concentration required to inhibit bacterial growth in broth were determined. In addition, the effects of epigallocatechin gallate and adhesive resin on the mechanical, color, and thermal film properties were investigated. The results indicate that pure epigallocatechin gallate inhibited the growth of both bacteria. However, only the films with 10 wt% epigallocatechin gallate (with and without adhesive resin) induced morphological changes and inhibited the growth of S. aureus (p < 0.05). In addition, the films with 10 wt% epigallocatechin gallate (with adhesive resin) induced morphological changes in Pseudomonas sp. (p < 0.05). The adhesive resin increased the epigallocatechin gallate release rate in the migration profile (p < 0.05). The epigallocatechin gallate and adhesive resin modified the film properties (p < 0.05). Fourier transform infrared analysis indicated hydrogen bonds between the adhesive resin and epigallocatechin gallate. This study demonstrated that epigallocatechin gallate is a potential antibacterial agent and that adhesive resin provides advantages to active films.

On the durability of low-density polyethylene nanocomposites

e-Polymers ◽  
2004 ◽  
Vol 4 (1) ◽  
Author(s):  
Jitendra K. Pandey ◽  
Raj Pal Singh
Keyword(s):  
Ir Spectroscopy ◽  
Morphological Changes ◽  
Diffusion Path ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Neat Polymer ◽  
The Matrix ◽  
Ft Ir ◽  
The Stability ◽  
Artificial Uv

Abstract Low-density polyethylene (PE) containing nano-particulate clay was prepared after functionalization with maleic anhydride (MA) by reactive grafting in the presence of peroxide followed by blending of maleated PE with neat polymer in different concentrations. Four classes of composites were obtained: (i) exfoliated, (ii) intercalated, (iii) microcomposites, and (iv) intermediate of intercalated and microcomposites, as evidenced by wide-angle X-ray diffraction. All samples were kept for artificial UV irradiation (λ ≥ 290 nm) and for composting to study their photo- and bio-durability. Fourier-transform IR spectroscopy (FT-IR) and scanning electron microscopy were used to monitor the functional group and morphological changes, respectively, whereas biodurability was evaluated by measuring the weight loss. MA functionalization and nature of composites have detrimental effects on the overall durability of composites. Nanocomposites showed higher resistance than microcomposites during initial weathering and composting with a long induction period. The stability of nanocomposites decreases with time and overall durability was worse than of pristine polymer in both environments. It was concluded that the initial protection is due to the filler-generated long diffusion path, which decreases the oxygen diffusion through the matrix. The bio-durability of composites decreased with oxo-degradation. Biodegradation of PE nanocomposites during composting follows the mechanism described by Albertsson et al. as evidenced by FT-IR spectroscopy.

scholarly journals MICROBIAL DEGRADATION OF LOW-DENSITY POLYETHYLENE (LDPE) BY FUNGUS ISOLATED FROM LANDFILL SOIL

2021 ◽  
Vol 21 (No 1) ◽  
Author(s):  
Jeeva Dharshni S ◽  
Kanchana M
Keyword(s):  
Structural Changes ◽  
Culture Media ◽  
Degradation Process ◽  
Low Density Polyethylene ◽  
Surface Erosion ◽  
Low Density ◽  
Ph Variation ◽  
Microbial Enzymes ◽  
Peak Intensity

A low density polyethylene (LDPE) is one of the hazardous polymers accelerates land and water pollution. Standardizing the protocol for degradation of plastics in an aesthetic approach is a big task. Low density polyethylene polymer can be degraded by microbial enzymes by means of cutting down the molecular chains. Two fungal strains Aspergillus fumigus and Xylaria sp. were showing high degradable activity through the determination of pH variation and carbon di oxide estimation. Aspergillus fumigus and Xylaria sp shows pH variation in the culture media containing LDPE strips after 30 days and was recorded as 6.5 to 8.4 and 6.5 to 7.7 respectively. The efficacy of polyethylene degradation was confirmed further by CO2 estimation of culture filtrate and was recorded as 1.460 g/l in Aspergillus fumigus and 1.350 g/l in Xylaria sp. Surface erosion and the formation of pits and cavities on the surface of the LDPE strips were also observed using Scanning Electron Microscope and significant disappearance in carbonyl peak with respect to the control band absorbance (2361.61 cm-1) and increase or decrease in peak intensity with respect to control indicates structural changes in chemical bond due to degradation process.

Characterization of the morphological changes in linear low-density polyethylene during the melting process using synchrotron radiation

1989 ◽  
Vol 22 (1) ◽  
pp. 237-244 ◽  
Author(s):  
P. Schouterden ◽  
M. Vandermarliere ◽  
C. Riekel ◽  
M. H. J. Koch ◽  
G. Groeninckx ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Morphological Changes ◽  
Melting Process ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

Long- and short-term antibacterial properties of low-density polyethylene-based films coated with zinc oxide nanoparticles for potential use in food packaging

2019 ◽  
Vol 35 (2) ◽  
pp. 117-134 ◽  
Author(s):  
Hajer Rokbani ◽  
France Daigle ◽  
Abdellah Ajji
Keyword(s):  
Zinc Oxide ◽  
Antibacterial Activity ◽  
Zinc Oxide Nanoparticles ◽  
Food Packaging ◽  
Antibacterial Properties ◽  
Polyethylene Film ◽  
Low Density Polyethylene ◽  
Oxide Nanoparticles ◽  
Low Density ◽  
Polyethylene Films

Concerns in food safety and the need for high-quality foods have increased the demand for extending the shelf life of packaged foods. Subsequently, promoting and investigating the development of antibacterial materials for food packaging has become inevitable. Zinc oxide nanoparticles have attracted attention lately owing to their multifunctional properties, especially antibacterial activity. For this study, antibacterial low-density polyethylene films were prepared by coating zinc oxide nanoparticles onto their surface. The low-density polyethylene film antibacterial activity was evaluated toward Gram-positive and Gram-negative bacteria. The scanning electron microscopy images showed that using anhydride-modified low-density polyethylene (LDPE-g-AM) resin permitted improved zinc oxide nanoparticle distribution on the low-density polyethylene film surface, reduced the agglomerate sizes, and reinforced the zinc oxide nanoparticle bonding to the low-density polyethylene film surface. We found that the coated low-density polyethylene films exhibited high antibacterial activity against both strains. The antibacterial tests also proved that the coated films retained their antibacterial efficiency toward Escherichia coli, even after eight months, with a reduction rate higher than 99.9%, whereas for Staphylococcus aureus the antibacterial properties for the linear low-density polyethylene (LLDPE) films decreased at eight months and improved for the LDPE-g-AM films. When the zinc oxide coated films were laminated with neat low-density polyethylene, only the LDPE-g-AM was still active against E. coli provided that the lamination thickness does not go beyond 8 µm. This research demonstrated that the coated low-density polyethylene films have excellent attributes when used as an active coating in the food packaging industry.

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