RT info:eu-repo/semantics/article
T1 Enhancing the processability and mechanical performance of collagen-based biofilms through supercritical carbon dioxide plasticisation
A1 Nuñez Carrero, Karina Carla
A1 Alonso Pastor, Luis Eduardo
A1 Lizalde Arroyo, Félix
A1 Lledó Martín, Jaime
A1 Oliveira Salmazo, Leandra
A1 López Gil, Alberto
A1 Rodríguez Pérez, Miguel Ángel
K1 Collagen
K1 Supercritical carbon dioxide
K1 Plasticisation
K1 Biofilms
K1 Packaging
AB The hierarchical structure and high molecular weight of bovine collagen fibres, along with their widespreadavailability, make this animal protein a promising candidate for biofilm production. However, unlike conven-tional thermoplastics, collagen processing is challenging due to its complex intra- and intermolecular in-teractions. This study investigated the use of supercritical carbon dioxide (sCO2) as a plasticising agent to modifythese interactions during a pretreatment phase prior to film formation via extrusion-compression moulding.Different supercritical conditions were tested, and the combined effect of sCO2 and glycerol (Gly), a commonplasticiser, was evaluated. Microstructural analyses of the pretreated powders and resulting biofilms revealed anunconventional plasticisation mechanism, characterised by the loss of the triple-helix structure and the formationof a randomly cross-linked network. This effect was particularly pronounced under supercritical conditions athigher temperatures (80 ◦C and 80–300 bar), where the loss of surface water from the collagen fibres and in-teractions between functional groups in denatured fibres led to enhanced plasticity. As a result, the extrudedfilms exhibited a reduction in stiffness of up to 20 % and an increase in elongation at break by more than 50 %. Incontrast, pretreatments at lower temperatures and pressures (35 ◦C and 80 bar) caused only minor chain scission,preserving the triple-helix structure and yielding rigid films with limited deformability. These findings demon-strated that controlling supercritical conditions in the presence of glycerol during collagen pretreatment is aneffective strategy to enhance the processability and mechanical performance of collagen-based biofilms.
PB Elsevier
SN 0260-8774
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/76085
UL https://uvadoc.uva.es/handle/10324/76085
LA eng
NO Journal of Food Engineering, 2025, vol. 399, p. 112615
NO Producción Científica
DS UVaDOC
RD 25-jun-2025