Mechanical and water vapor barrier properties of extruded and heat-pressed gelatin films |
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Authors: | Jang Woo Park Seung Yong Cho |
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Affiliation: | a Department of Food Science and Technology, Food and Bio-industrial Research Center, Hankyong National University, Ansung 456-749, Republic of Korea b Department of Packaging Science, Clemson University, Clemson, SC 29634, USA c Institute of Life Sciences and Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-Dong, Seongbuk-Ku, Seoul 136-713, Republic of Korea |
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Abstract: | Gelatin-based edible films were produced by extruding hot melt of gelatin-based resins through a die with slot orifice and followed by heat-pressed method. The resins were plasticized with glycerol, sorbitol and the mixture of glycerol and sorbitol (MGS). The effect of type of plasticizer on extruded and heat-pressed (EHP) film-forming capacity was studied, and the mechanical and water barrier properties of resulting EHP gelatin films were compared with those of gelatin films prepared by solution casting method. Stretchable films were formed when glycerol or MGS were used as plasticizer, whereas resins plasticized with sorbitol were extruded in non-stretchable sheets. Glycerol plasticized gelatin film showed the highest flexibility and transparency among the EHP films tested. Tensile strength (TS), elongation (E) and water vapor permeability (WVP) of glycerol plasticized EHP gelatin films were 17.3 MPa, 215.9% and 2.46 ng m/m2 s Pa, respectively, and EHP gelatin films had higher E values, lower TS values and higher WVP values compared to the glycerol plasticized cast gelatin films. |
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Keywords: | Gelatin Biopolymer Extrusion film Heat-pressed film |
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