title: Kinetic study of κ-carrageenan degradation and its impact on mechanical and structural properties of chitosan/κ-carrageenan film.
abstract: The purpose of the current research was to study κ-carrageenan degradation behavior under thermal treatment, and its influence on chitosan κ-carrageenan film properties. A pseudo-first-order reaction equation was applied by using reciprocal plots of κ-carrageenan molecular mass versus heating time, which showed a strong dependence on heating time. Incorporation of thermally treated κ-carrageenan into the chitosan had diminished both water resistance and water vapor permeability of the blend, in contrast to those for intact or untreated κ-carrageenan. A dramatic decrease of equilibrium moisture content and tensile strength were noticed, and these parameters were more affected by the longer times. Furthermore, the contact angle of the films was found to be a function of the heating time. Scanning electron microscopy revealed apparent agglomeration of κ-carrageenan through the thermal process. Atomic force microscopy demonstrated that the intact blend had the flattest surface, whilst the blend containing treated κ-carrageenan had high roughness.
authors.affiliation: Research Institute of Food Science and Technology (RIFST), Mashhad, Iran.
authors.forename: Mahdiyar
authors.initials: M
authors.lastname: Shahbazi
authors.affiliation: Research Institute of Food Science and Technology (RIFST), Mashhad, Iran. Electronic address: gh.rajabzaheh@rifst.ac.ir.
authors.forename: Ghadir
authors.initials: G
authors.lastname: Rajabzadeh
authors.affiliation: Procter Department of Food Science, University of Leeds, Leeds LS29JT, United Kingdom.
authors.forename: Rammile
authors.initials: R
authors.lastname: Ettelaie
authors.affiliation: Research Institute of Food Science and Technology (RIFST), Mashhad, Iran.
authors.forename: Ali
authors.initials: A
authors.lastname: Rafe
mesh_terms: D002351:Carrageenan / Q000737:chemistry*; D048271:Chitosan / Q000737:chemistry*; D006361:Heating; D007700:Kinetics; D010539:Permeability; D058105:Polymerization; D013227:Steam / Q000032:analysis; D013499:Surface Properties; D013718:Tensile Strength; D014867:Water / Q000737:chemistry
chemical_list: D013227:Steam; D014867:Water; D002351:Carrageenan; D048271:Chitosan
keywords: Chitosan blend film; Equilibrium moisture content; Pseudo first-order reaction; Surface roughness; Tensile strength; Thermal depolymerisation