Influence of the Physical State of Water on the Barrier Properties of Hydrophilic and Hydrophobic Films

Morillon, V; Debeaufort, Frédéric; Capelle, Martine; Blond, G.; Voilley, Andrée

doi:10.1021/jf990809z

Cited by 57 publications

(38 citation statements)

References 19 publications

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“…Water vapor permeability BC membranes are of hydrophilic nature and they have poor barrier properties when compared to the conventional polymers, such as polyethylene (Morillon et al 2000). The permeability results towards water vapor for BC and BCC 6 membranes are shown in Fig.…”

Section: Surface Energymentioning

confidence: 99%

Preparation and characterization of bacterial cellulose membranes with tailored surface and barrier properties

et al. 2010

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Modified bacterial cellulose membranes with tailored properties, regarding their surface and barrier properties were prepared by controlled heterogeneous esterification with hexanoyl chloride. The characterization of the esterified bacterial cellulose membranes was performed by FTIR spectroscopy, elemental analyses, X-ray diffraction, thermogravimetry and contact angle measurements. The esterified membranes showed an increased hydrophobic surface character, while preserving the bulk structure of the pristine material. The evaluation of the barrier properties was carried out through permeability measurements towards water vapor at different relative humidities and by the permeability towards humidified carbon dioxide, oxygen and nitrogen using the time-lag method. A decrease of roughly 50% in both water and gas permeation through bacterial cellulose membranes was observed after heterogeneous esterification. The bacterial cellulose membranes prepared are a good and interesting example of the development of bio-based materials with promising applications in the packaging industry.

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Section: Surface Energymentioning

confidence: 99%

Preparation and characterization of bacterial cellulose membranes with tailored surface and barrier properties

et al. 2010

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“…Por exemplo, o ácido araquídico (22C) possui maior permeabilidade ao vapor de água que os ácidos palmítico (16C) e esteárico (18C), o que pode ser explicado pelo fato de que a cadeia longa do lipídio sugere uma estrutura mais heterogê-nea 21 . Os surfactantes são compostos que apresentam atividade na superfície da interface entre duas fases, tais como ar-água, óleo-água, e na superfície de sólidos.…”

Section: Introductionunclassified

Filmes compostos de gelatina, triacetina, ácido esteárico ou capróico: efeito do pH e da adição de surfactantes sobre a funcionalidade dos filmes

Davanço¹,

Tanada-Palmu²,

Grosso³

2007

Ciênc. Tecnol. Aliment.

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ResumoO desenvolvimento de biofilmes tem crescido devido à possibilidade de substituição parcial de materiais plásticos não biodegradáveis. Proteínas e polissacarídeos têm sido utilizados para a produção de filmes com boas propriedades mecânicas. Porém, filmes a partir desses materiais apresentam alta permeabilidade ao vapor de água. Uma alternativa usada para diminuir a permeabilidade ao vapor de água dos filmes é a incorporação de substâncias hidrofóbicas na composição da solução filmogênica, porém essa incorporação não ocorre de maneira homogênea. Com o objetivo de melhorar a incorporação das substâncias hidrofóbicas (ácido esteárico e ácido capróico) na matriz protéica (gelatina) do filme foram adicionados os surfactantes (SDS e Tween 80), que são substâncias capazes de interagir com a proteína e com o ácido graxo, tornando a matriz filmogênica menos heterogênea. O efeito do pH também foi estudado, com a finalidade de observar se este exerce influência na homogeneidade da matriz filmogênica. A adição do ácido esteárico aos filmes de gelatina foi mais eficiente na redução da permeabilidade ao vapor de água do que o ácido capróico. A adição do surfactante SDS reduziu a permeabilidade ao vapor de água dos filmes contendo ácido esteárico, ou ácido capróico. O ajuste de pH nos filmes sem adição de surfactantes também produziu matrizes mais homogêneas. Palavras-chave: biofilmes; gelatina; ácido capróico; ácido esteárico; SDS (lauril sulfato de sódio); Tween 80. AbstractThe development of biofilms has grown considering the possibility of partial substitution of plastic materials which are not biodegradable. Proteins and polysaccharides have been used to produce films with good mechanical properties. However, films produced with these materials present a high permeability in water vapor. An alternative to improve the water vapor barrier of films is to incorporate hydrophobic substances (stearic and caproic fatty acids) in the composition of the filmogenic solution, however this incorporation does not occur homogeneously. Thus, to improve the incorporation of hydrophobic substances in the protein matrix of the film, surfactants (SDS and Tween 80) were added. They are compounds that improve the interaction between the protein and the fatty acids, producing a less heterogeneous filmogenic matrix. The effect of pH was also studied, with the purpose of observing if it influences the homogeneity of the filmogenic matrix. The addition of stearic acid to the gelatin-based films was more efficient in reducing the water vapor permeability than the caproic acid. Adding surfactant SDS reduced water vapor permeability of both films, with stearic acid or caproic acid. Adjusting the pH to the films with no surfactants produced more homogeneous matrices. Keywords: edible film; gelatin; caproic acid; stearic acid; SDS (sodium lauryl sulphate); Tween 80.Filmes compostos de gelatina, triacetina, ácido esteárico ou capróico: efeito do pH e da adição de surfactantes sobre a funcionalidade dos filmes Composite films made with gelatin, tr...

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“…This V CH 2 variation remains much reduced compared to a solid-liquid transition (1.5-5 Å 3 ). The resultant effect of polymorphic variations on the bulk density of tristearin was reported by Morillon et al [20]: density values of 1.014, 1.017 and 1.043 g/cm 3 were observed respectively for the a, b 0 and b polymorphs. Very few density values of fat materials are available in the literature and, most of the time, consist of bulk density measurements.…”

Section: Effect Of Cooling Rate On Microstructure and Mass-volume Relmentioning

confidence: 62%

Effect of Cooling Rate on the Structural and Moisture Barrier Properties of High and Low Melting Point Fats

Bourlieu-Lacanal

Guillard

Ferreira

et al. 2009

J Americ Oil Chem Soc

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The effect of three cooling rates (rapid, intermediate and slow CR) on the moisture barrier properties and on the physical state of acetylated and high melting point hydrophobic self-supported moisture barriers has been investigated. The selected CR were representative of industrial processing conditions and the selected barrier materials of common effective GRAS substances (acetomonopalmitin, white beeswax, two commercial blends of beeswax and acetylated glycerides and a blend of palmitic/ stearic acids). Variations of CR affected crystallisation kinetics, SFC in an extend depending on the fat chemical composition and degree of undercooling, crystal size and ratio of polymorphs present in the materials. It did not have major influence on the contact angles with water measured at the surface of the materials and on the mass-volume area properties of the material. The resultant effect on the macroscopic moisture barrier properties of the materials were evaluated using water vapour permeability (WVP) measurements. The CR had no significant effect on the WVP, except for one blend of acetylated fat and beeswax for which a slow CR may have favoured the healing of imperfections. The variations of WVP between all materials and CRs were mainly attributed to variation in materials polarity using multivariable analysis.

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Influence of the Physical State of Water on the Barrier Properties of Hydrophilic and Hydrophobic Films

Cited by 57 publications

References 19 publications

Preparation and characterization of bacterial cellulose membranes with tailored surface and barrier properties

Preparation and characterization of bacterial cellulose membranes with tailored surface and barrier properties

Filmes compostos de gelatina, triacetina, ácido esteárico ou capróico: efeito do pH e da adição de surfactantes sobre a funcionalidade dos filmes

Effect of Cooling Rate on the Structural and Moisture Barrier Properties of High and Low Melting Point Fats

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