Effect of relative humidity on carvacrol release and permeation properties of chitosan based films and coatings

Kurek, Mia; Guinault, Alain; Voilley, Andrée; Galić, Kata; Debeaufort, Frédéric

doi:10.1016/j.foodchem.2012.11.132

Cited by 103 publications

(63 citation statements)

References 33 publications

(36 reference statements)

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“…The detrimental effect of humidity on the barrier properties of hydrophilic polymers is well-known (Zhang et al 2001;Hu et al 2005). It is ascribed to the plasticizing effect of water molecules adsorbed by the polymer surface and bulk, especially in correspondence with the amorphous regions (Aulin et al 2010;Kurek et al 2014). Weakening of the hydrogen bonds at intramolecular and intermolecular level may occur in the long run.…”

Section: Oxygen and Water Vapor Barrier Propertiesmentioning

confidence: 99%

Microfibrillated cellulose (MFC): pullulan bionanocomposite films

et al. 2014

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The aim of this work was to develop and characterize microfibrillated cellulose (MFC)/pullulan bionanocomposites. Fourier transform infrared spectroscopy suggested that the affinity between the two polymers resulted in new hydrogen bonding of the nanocomposite materials compared to pristine pullulan. At the same time, an increase in crystallinity was observed proportional to the amount of MFC used, as shown by the X-ray analyses. Accordingly, final films showed improved mechanical properties proportionally to the filler loading, with impressive elastic modulus and tensile strength of *4.50 GPa and *60 MPa, respectively, for the sample containing 10 % MFC. However, as demonstrated by the moisture sorption isotherms, the addition of MFC did not help reduce the amount of water adsorbed by the samples. In addition, the oxygen and water vapor permeability data clearly showed that final films still suffered high relative humidity values, whereas their barrier performance toward oxygen was excellent under dry conditions, with O 2 permeability coefficients (P 0 O 2 ) comparable with those of common high barrier films/ coatings. Finally, while the nanocomposites in the form of films had high haze values (from 23 to 40 %), the same nanocomposites in the form of coatings were decidedly more transparent, which suggests that their use as thin layers could be more suitable when the ''seethrough'' capability must be preserved, for example in food packaging applications.

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Section: Oxygen and Water Vapor Barrier Propertiesmentioning

confidence: 99%

Microfibrillated cellulose (MFC): pullulan bionanocomposite films

et al. 2014

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“…Moreover, there are evidences that EOs incorporated to edible films can inhibit a large variety of food-borne pathogens [13,[15][16][17][18][19]. e main advantage of using EOs in a polymer matrix coating is a slow diffusion of the antimicrobial agent, leaving high concentrations of the active compound in contact with the food surface where contamination has occurred or is likely to occur, for a long period [20]. e aim of this work was to evaluate the effect of pH and Mexican oregano essential oil concentration added to CMC and S edible films on Listeria monocytogenes and Staphylococcus aureus.…”

Section: Introductionmentioning

confidence: 99%

Effect of pH and Mexican Oregano (Lippia berlandieri Schauer) Essential Oil Added to Carboxymethyl Cellulose and Starch Edible Films on Listeria monocytogenes and Staphylococcus aureus

Navarro-Cruz

Ochoa‐Velasco

Caballero-Alvarez

et al. 2018

Journal of Food Quality

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e aim of this work was to evaluate the e ect of pH and Mexican oregano essential oil (MOEO) added to carboxymethyl cellulose (CMC) and starch (S) edible lms on Listeria monocytogenes and Staphylococcus aureus. CMC and S edible lms were formulated with di erent concentrations (0%, 0.25%, 0.50%, 0.75%, and 1%) of MOEO at di erent pH (5, 6, or 7). Antimicrobial assay was performed. Inhibition curves were tted to the Fermi model. Signi cant di erences (p < 0.05) were found in t c (time to reduce 50% of microbial population) and a (slope of the curve around t c ), being lower at acidic pH. For L. monocytogenes, CMC lms exhibited a higher antimicrobial e ectiveness (0.50% of MOEO) compared to S lms which need a higher concentration of MOEO (0.75%). S. aureus was inhibited with CMC lms at 0.50% MOEO and pH 5 and 6. Microbial modeling has allowed estimating key intrinsic factors as pH and MOEO concentration with the synergistic e ect against two important food-borne pathogens.

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“…The detrimental effect of humidity on the barrier properties of pullulan nanocomposite coatings has already been described for other lamellar clays, such as natural montmorillonite [9] and, more recently, graphene oxide [10]. This effect is ascribed to the plasticizing effect of water molecules adsorbed by the polymer surface and bulk, especially in correspondence with the amorphous regions [14,15]. The tight and dense network ensuing from the cooperative adhesion forces at the biopolymer/filler interface is thus gradually lost, with a concurrent increase in chain mobility and free volume of the nanocomposite network, until an unconstrained diffusion of the permeant at 90% RH is observed, due to what has been previously defined as the "diluting" effect of water molecules [10].…”

Section: Oxygen Barrier Performancementioning

confidence: 86%

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

Ünalan

Boyacı

Trabattoni

et al. 2017

Preprint

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This study presents a new bionanocomposite coating on poly(ethylene terephthalate) (PET) made of pullulan and synthetic mica. Mica nanolayers have a very high aspect ratio (α) at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mica (0.02 wt%, which is ϕ ≈ 0.00008) in pullulan coatings dramatically improved the oxygen barrier performance of the nanocomposite films under dry conditions, whereas this performance was partly lost as the environmental relative humidity (RH) increased. This outcome was explained in terms of the perturbation of the spatial ordering of mica sheets within the main pullulan phase because of RH fluctuations, as confirmed by modelling of the experimental OTR data according to Cussler's model. The presence of the synthetic nanobuilding block (NBB) led to a decrease in both static and kinetic coefficients of friction compared with neat PET (≈12% and 23%, respectively) and PET coated with unloaded pullulan (≈ 26% reduction in both coefficients). In spite of the presence of the filler, all of the coating formulations did not significantly impair the overall optical properties of the final material, which exhibited haze values below 3% and transmittance above 85%, with the only exception represented by the formulation with the highest loading of mica (1.5 wt%, which is ϕ ≈ 0.01). These findings revealed, for the first time, the potential of the NBB mica to produce nanocomposite coatings in combination with biopolymers for the generation of new functional features, such as transparent high oxygen barrier materials.

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Effect of relative humidity on carvacrol release and permeation properties of chitosan based films and coatings

Cited by 103 publications

References 33 publications

Microfibrillated cellulose (MFC): pullulan bionanocomposite films

Microfibrillated cellulose (MFC): pullulan bionanocomposite films

Effect of pH and Mexican Oregano (Lippia berlandieri Schauer) Essential Oil Added to Carboxymethyl Cellulose and Starch Edible Films on Listeria monocytogenes and Staphylococcus aureus

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

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