Correlations between structural,barrier, thermal and mechanical properties of plasticized gelatin films |
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| Authors: | S Rivero MA García A Pinotti |
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| Affiliation: | 1. Centro de Investigación y Desarrollo en Criotecnología de Alimentos (CIDCA), CONICET La Plata, Facultad de Ciencias Exactas, Argentina;2. Facultad de Ingeniería, UNLP, 47 y 116, La Plata (1900), Argentina;1. Department of Animal Products Technology, Food Technology, University of Agriculture in Cracow, Balicka 122, 30-149, Cracow, Poland;2. Department of Sports Medicine & Human Nutrition, Institute of Human Physiology, University School of Physical Education in Krakow, al. Jana Paw?a II 78, 31-571, Cracow, Poland;1. Department of Food Technology, Faculty of Agro-Industry, Prince of Songkla University, 15 Kanchanawanish Road, Hat Yai, Songkhla 90112, Thailand;2. Department of Material Product Technology, Faculty of Agro-Industry, Prince of Songkla University, 15 Kanchanawanish Road, Hat Yai, Songkhla 90112, Thailand;1. School of Food Science and Technology, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia;2. School of Fundamental Science, Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia;1. Central Institute of Post-Harvest Engineering and Technology, Ludhiana 141 004, Punjab, India;2. Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA;3. College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou, PR China;4. Department of Agricultural and Biosystems Engineering, Iowa State University, Ames, IA 50011, USA;5. Department of Food Science and Human Nutrition, Iowa State University, Ames, IA 50011, USA;1. Laboratory of Enzyme Engineering and Microbiology, National School of Engineering of Sfax (ENIS), University of Sfax, P.O. Box 1173, 3038, Sfax, Tunisia;2. UMR A 102-02 PAM-PCAV Physico-Chemistry of Food and Wine Laboratory, 1 esplanade Erasme, Univ. Bourgogne Franche-Comté/Agrosup Dijon, F-21000, Dijon, France;3. Dpt BioEngineering, IUT Dijon-Auxerre, 7 blvd Docteur Petitjean, 21078, Dijon cedex, France |
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| Abstract: | The aims of this work were to develop gelatin films using glycerol as plasticizer (0–100% based on protein mass) and to establish relationships between glycerol content and structural, barrier, thermal and mechanical film properties. These correlations were established since WVP exhibited a minimum for films containing 20 g glycerol/100 g gelatin, while flexibility increased from 2.2% to 180.9% and Tg shifted from 137.5 to 21.3 °C, for films without glycerol and plasticized films with 80 g glycerol/100 g gelatin, respectively. Furthermore, a satisfactory fit between Tg experimental data and predicted values by Couchman and Karasz's equation was found, with glycerol ranging from 0 to 60 g/100 g gelatin. Tg values correlated inversely with film moisture content, and both mechanical and thermal properties showed a strong dependence since elastic modulus and Tg followed a similar trend. Films exhibited similar X-ray patterns regardless of the glycerol concentration, showing a displacement in the position of the peak located at around 2θ = 8°, which shifted towards lower 2θ values with glycerol content.The abovementioned correlations between film physical properties and glycerol content, would allow to select the optimum conditions to develop, process and manage gelatin films according to specific requirements.Industrial relevanceThe methodology used in this work is of considerable importance for the film development and could be used in industrial applications. The management of film formulations and the function that each component plays could allow to obtain tailormade films. A series of relationships between film properties based on gelatin was found, as well as between these properties and glycerol content of the films. An inflexion point in the behavior and microstructure of these materials was established due to glycerol concentration. The addition of higher quantities of glycerol than that corresponds to the abovementioned point, would not be recommendable since the properties are not modified and moreover, it is not profitable. These results would allow better management of film formulations and an appropriate selection of plasticizer concentration in accordance with the specific requirements of potential users. |
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