Water and Glycerol as Plasticizers Affect Mechanical and Water Vapor Barrier Properties of an Edible Wheat Gluten Film

Journal of Food Science - Tập 58 Số 1 - Trang 206-211 - 1993
Nathalie Gontard1,2, Stéphane Guilbert3, J.L. Cuq4
1Ingénierie des Agro-polymères et Technologies Émergentes
2Université de Montpellier
3Institut national d’études supérieures agronomiques de Montpellier
4Authors Gontard and Cuq are with the laboratory of Genie Biol-ogique et Sciences des Aliments, Universite de Montpellier II, Sciences et Techniques do Languedoc, place E. Bataillon, 34095 Montpellier, France. Author Guilbert is with the ClRAD-SAR, laboratory of Génie et Technologie Alimentaires, 73 rue Jean-Fran-cois Breton, BP 5035, 34032 Montpellier cedex, France. Tel: 67 615759.

Tóm tắt

ABSTRACTGlycerol improved film extensibility but reduced film puncture strength, elasticity, and water vapor barrier properties. The plasticizing effect of water was highly temperature dependent. During hydration of gluten film, a sharp decrease in puncture strength, elasticity, and an increase of extensibility and water vapor transmission rate were observed at 5, 30 and 50°C for respective water contents of 30 (0,8 aw,), 15 (0,7 aw) and 5% (0,4 aw). This was related to disruptive water‐polymer hydrogen bonding and glass‐to‐rubber transition.

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