Effect of crosslinking on the properties of sodium caseinate films
Mariana Pereda
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Search for more papers by this authorMirta I. Aranguren
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Search for more papers by this authorCorresponding Author
Norma E. Marcovich
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina===Search for more papers by this authorMariana Pereda
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Search for more papers by this authorMirta I. Aranguren
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Search for more papers by this authorCorresponding Author
Norma E. Marcovich
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina
Institute of Research in Materials Science and Technology (INTEMA), Department of Chemical Engineering, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, (7600) Mar del Plata, Argentina===Search for more papers by this authorAbstract
Protein films are used as effective lipid, oxygen, and aroma barriers at moderate relative humidity conditions. However, they perform poorly as moisture barriers. The introduction of crosslinks within or between protein chains by enzymatic or chemical modification has been proposed as an alternative means to achieving a stronger polymeric matrix structure, which would result in better functional film properties. In this article, we report the preparation and characterization of sodium caseinate (SC) films crosslinked by glutaraldehyde (GTA) or heat. The crosslinking density increased with GTA content. The thermal stability and tensile modulus and strength increased with GTA content, although films with a low crosslinking density exhibited lower properties than the uncrosslinked sample. Unexpectedly, water vapor permeability and absorption also increased with crosslinking density. The crosslinking of SC was also induced by simple heating. The resulting films showed enhanced thermal, mechanical, and barrier properties compared to the unmodified SC films and even the GTA-crosslinked samples. GTA crosslinking was unable to reduce the high hydrophilicity of the SC films. Thermally induced crosslinking was revealed to be a valid alternative for improving the properties of SC films, without the inherent complications associated with the use of a chemical crosslinking agent. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
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