Thermal properties and adhesiveness of soy protein modified with cationic detergent |
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Authors: | Y?Wang Email author" target="_blank">D?WangEmail author X?S?Sun |
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Affiliation: | (1) Department of Biological and Agricultural Engineering, Kansas State University, 66506 Manhattan, Kansas;(2) Department of Grain Science and Industry, Kansas State University, 66506 Manhattan, Kansas |
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Abstract: | This research studied the effects of cationic detergents on the adhesiveness and thermal properties of soy protein isolate
(SPI). Three cationic detergents, hexadecyltrimethyl ammonium bromide, ethylhexadecyldimethyl ammonium bromide (EDAB), and
benzyldimethylhexadecyl ammonium chloride, each at concentrations of 1.3, 2.6, 5.2, and 7.8 mM, were used to modify SPI. The
effect of pH at selected EDAB concentrations was also studied. Results showed that both detergent concentration and pH had
significant effects on the adhesiveness of modified SPI. SPI modified with detergent at a concentration of 2.6 mM yielded
the greatest dry tensile strength and water resistance, which indicated that a moderate protein denaturation might be favorable
to the adhesion of SPI. Both modified and unmodified SPI showed greater adhesive strength at their optimal pH values. Modified
SPI showed greatest adhesive strength at pH 7, whereas unmodified SPI showed greatest adhesive strength at pH 4.5; the tensile
strength of modified SPI was greater than that of unmodified SPI. The protein-denaturation temperature and the enthalpy of
modified SPI adhesives were also analyzed by using DSC. Denaturation of the native structure of SPI increased as detergent
concentration increased. |
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Keywords: | Adhesive denaturation detergent pH protein modification soy protein thermal property tensile strength water resistance |
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