Effect of Laponite® on the structure, thermal stability and barrier properties of nanocomposite gelatin films

The effect of Laponite® (a synthetic clay) on the structure, thermal and water vapor barrier properties of nanocomposite gelatin films produced by casting with 0, 4.5 and 15% w Lap/w gelatin, was studied. X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis and Fourier tr...

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Bibliographic Details
Published in:Food bioscience 2020-06, Vol.35, p.100596, Article 100596
Main Authors: López-Angulo, Daniel, Bittante, Ana Mônica Q.B., Luciano, Carla G., Ayala-Valencia, German, Flaker, Christian H.C., Djabourov, Madeleine, José do Amaral Sobral, Paulo
Format: Article
Language:English
Subjects:
Biodegradable films
Biopolymer
Crystallinity
Glass transition
Laponite
Water vapor permeability
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Summary:The effect of Laponite® (a synthetic clay) on the structure, thermal and water vapor barrier properties of nanocomposite gelatin films produced by casting with 0, 4.5 and 15% w Lap/w gelatin, was studied. X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis and Fourier transform infrared spectroscopy measurements were reported. The X-ray diffraction patterns showed dual crystalline structure of the films with collagen-type bundles of triple helices, intercalated inside clay platelets, increasing interlayer distances. Depending on the renaturation of triple-helices and Laponite content, the glass transition temperatures substantially decreased. The amount of helices decreased with Lap concentration, affecting the enthalpy of melting. The nanocomposite gelatin films showed improved thermal stability. Changes of water vapor permeability could be related to the presence of a larger free volume of the coils and intercalated structures, facilitating water transfer through the film. •Lap improves the thermal stability of the gelatin matrix.•Nanocomposite lead to substantial increase of the basal distance of the platelets.•Water vapor permeability does not change with the incorporation of Lap.
ISSN:2212-4292
2212-4306
DOI:10.1016/j.fbio.2020.100596