Thermomechanical and transport properties of LLDPE films impregnated with clove essential oil by high-pressure CO2

Medeiros, Glaucia R.; Guimarães, Carolina Reis; Ferreira, Sandra R.S.; Carciofi, Bruno Augusto Mattar

doi:10.1016/j.supflu.2018.05.006

Cited by 14 publications

(9 citation statements)

References 60 publications

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“…Besides, it offers the possibility to combine both SFE and SSI in a continuous system [ 34 , 35 ]. Numerous investigations have focused on the supercritical impregnation of natural extracts, such as thyme [ 36 ], clove [ 37 , 38 ] or oregano essential oils [ 39 ] among others, into synthetic polymeric films.…”

Section: Introductionmentioning

confidence: 99%

Application of a Natural Antioxidant from Grape Pomace Extract in the Development of Bioactive Jute Fibers for Food Packaging

et al. 2021

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There is an increasing demand for the use of new food packaging materials. In this study, natural jute fibers impregnated with a Petit Verdot Red Grape Pomace Extract (RGPE) was proposed as a new active food packaging material. Pressurized Liquid Extraction (PLE) and Enhanced Solvent Extraction (ESE) techniques were employed to obtain the bioactive RGPE. Afterward the supercritical solvent impregnation conditions to obtain RGPE-natural jute fibers were studied, by varying pressure, modifier percentage and dried RGPE mass. PLE technique offered the highest bioactive extract at 20 MPa, 55 °C, 1 h residence time using C2H5OH:H2O (1:1 v/v), providing an EC50 of 3.35 ± 0.25 and antibacterial capacity against Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa (MIC of 12.0, 1.5 and 4.0 mg/mL RGPE respectively). The natural jute fibers impregnated with 3 mL of that RGPE (90 mg/mL) at 50 MPa and 55 °C generated the most efficient packing material with regards to its food preservation potential.

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Section: Introductionmentioning

confidence: 99%

Application of a Natural Antioxidant from Grape Pomace Extract in the Development of Bioactive Jute Fibers for Food Packaging

et al. 2021

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“…The increasing concern about resistant microorganisms stimulates the study of new and more effective antimicrobial agents (Raghunath and Perumal, 2017;Tang and Lv, 2014). New agents can be obtained from biological sources, such as bacteriocins and essential oils, or synthesized organic/inorganic compounds (Han, 2005;Medeiros et al, 2017;Medeiros et al, 2018). Good antimicrobial effects have been obtained from metal oxide nanoparticles (Raghunath and Perumal, 2017), such as MgO (Tang et al, 2012), Cu 2 O, CuO, ZnO, TiO 2 , and WO 3 (Duffy et al, 2018;Vargas-Reus et al, 2012), which present distinct behavior and properties from micrometric or millimetric particles (Azeredo, 2013;Martinez-Gutierrez et al, 2010;Morais and Durán, 2006).…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Activity of Zinc Oxide Nanoparticles Synthesized by Solochemical Process

Souza

Haberbeck

Riella

et al. 2019

Braz. J. Chem. Eng.

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ZnO-NPs can be obtained through various methods, resulting in nanoparticles with different size and morphology, which directly influences their antimicrobial potential. The objective of this work was to evaluate the antibacterial activity of ZnO-NPs obtained by a solochemical process against important human foodborne pathogens: Staphylococcus aureus, Salmonella Typhimurium, Bacillus cereus and Pseudomonas aeruginosa. ZnO-NPs were identified as nanorods with the length between 90.1 and 100 nm (10.5 % frequency), the diameter between 80.1 and 90 nm (21 % frequency), and wurtzite type crystalline structure. The Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) were equal to 0.05 mg mL-1 and 0.5 mg mL-1 for S. aureus and S. Typhimurium, respectively, lower than previous results related in the literature. ZnO-NPs produced by solochemical method had a superior antibacterial activity. For instance, they can be incorporated in packaging materials for increasing microbial safety and food shelf-life by inhibiting bacterial growth.

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“…Mechanistic and empirical models for diffusion-controlled systems (Equations 6 and 7) were fitted to the release data of MH from PLGA microspheres, whereas mechanistic and empirical models for erosion-controlled systems (Equations 8 and 9) were fitted to the release data of FITC-dextran from PLGA microspheres. A computational routine was written in the Matlab ® software (version R2013a, Mathworks, USA) using the nonlinear least-squares method and the trust-region reflective Newton algorithm (Longhi et al, 2017;Medeiros et al, 2018). The values of the initial try for each parameter were based on the observation of experimental data.…”

Section: Numerical Solutionmentioning

confidence: 99%

Transport properties of hydrophilic compounds in PLGA microspheres

Burin

Santos

Battisti

et al. 2022

RSD

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Biodegradable polyesters, such as the poly(lactic-co-glycolic acid) (PLGA), have been extensively used as a polymer matrix for entrapping a variety of active compounds. In this study, the physicochemical phenomena that control the mass transport mechanism of hydrophilic compounds released from PLGA microspheres were identified. This study aims to produce and characterize PLGA microspheres loaded with metformin hydrochloride (MH) and perform a case study using the literature data of PLGA microspheres loaded with fluorescein isothiocyanate-dextran (FITC-dextran). The MH is a low molecular weight compound that was easily and rapidly transported by diffusion mechanism through the microsphere pores. The FITC-dextran, as a high molecular weight compound, depended on the mechanism of polymer erosion and mesopore formation, with 18 days of duration, before its release by diffusion mass transfer. Values of the effective diffusion coefficient of MH and FITC-dextran, both in PLGA, were 2.4 x 10-13 and 5.3 x 10-18 m2 s-1, respectively, with a difference of five orders of magnitude attributed to the molecular weight of these hydrophilic compounds and the main mass transport that governed their release. This study provides important insights into the mechanisms of mass transfer and their correlation with the physicochemical properties of both hydrophilic compounds and the PLGA matrix, contributing to the development of biodegradable controlled delivery systems for a variety of applications in chemical, biotechnological, and pharmaceutical industries.

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Thermomechanical and transport properties of LLDPE films impregnated with clove essential oil by high-pressure CO2

Cited by 14 publications

References 60 publications

Application of a Natural Antioxidant from Grape Pomace Extract in the Development of Bioactive Jute Fibers for Food Packaging

Application of a Natural Antioxidant from Grape Pomace Extract in the Development of Bioactive Jute Fibers for Food Packaging

Antibacterial Activity of Zinc Oxide Nanoparticles Synthesized by Solochemical Process

Transport properties of hydrophilic compounds in PLGA microspheres

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