title: Characterization of agar/soy protein biocomposite films: Effect of agar on the extruded pellets and compression moulded films.
abstract: Agar/soy protein biocomposite films were successfully processed by extrusion and compression moulding, obtaining transparent and homogeneous films. The conformational changes occurred during the extrusion process and the effect of agar on the final properties were analyzed. As shown by differential scanning calorimetry (DSC) and specific mechanical energy (SME) values, during the extrusion process protein denatured and unfolded protein chains could interact with agar. These interactions were analyzed by Fourier transform infrared spectroscopy (FTIR) and the secondary structure was determined from the amide I band. Those interactions were supported by the decrease of film solubility. Furthermore, the good compatibility between agar and soy protein was confirmed by the images from scanning electron microscopy (SEM).
authors.affiliation: BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain.
authors.forename: T
authors.initials: T
authors.lastname: Garrido
authors.affiliation: BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Etxabide
authors.affiliation: BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Guerrero
authors.affiliation: BIOMAT Research Group, University of the Basque Country (UPV/EHU), Escuela de Ingeniería de Gipuzkoa, Plaza de Europa 1, 20018 Donostia-San Sebastián, Spain. Electronic address: koro.delacaba@ehu.eus.
authors.forename: K
authors.initials: K
authors.lastname: de la Caba
mesh_terms: D000362:Agar / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008968:Molecular Conformation; D030262:Soybean Proteins / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D030262:Soybean Proteins; D000362:Agar
keywords: Agar; Biocomposite films; Compression; Extrusion; Soy protein