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vol. 9, nr. 1 (2007)
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Tensile properties of wheat starch film with the addition of sorbitol and albumin
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Danuta M. Napierała1, Jerzy Stangierski2
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1 Department of Physics, Agricultural University, ul. Wojska Polskiego 38/42, 60-637 Poznań
e-mail: dnapiera@.au.poznan.pl |
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2 Department of Food Quality Management, Agricultural University
ul. Wojska Polskiego 31, 60-624 Poznań |
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vol. 9 (2007), nr. 1,
pp. 123-133
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abstract:
Mechanical properties of wheat starch film with different amount of additives: sorbitol as plasticizer and bovine serum albumin, were investigated in the simple extension test. The concentration of sorbitol in 2.5% filmogenic starch blend was 20 and 40% and the concentration of albumin was 0, 2 and 4%. The data were compared with those obtained for a commercial synthetic film based on polypropylene and polyester. Mechanical parameters: tensile strength, strain at break, stress in relative strain of 0.01 and 0.02, density of elastic energy accumulated at break and Young modulus were determined from the force-deformation curves for all the films studied. The best mechanical performance was observed for the starch films with sorbitol at 40% and albumin below 2%. The presence of globular denaturated protein in higher concentration makes it difficult for the polymer chains to form a strongly entangled network, responsible for high tensile strength.
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keywords:
starch film, sorbitol, albumin, mechanical properties, Young modulus
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original in:
English
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