Thermal aggregation of whey proteins in the presence of buttermilk concentrate |
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Authors: | Maxime SaffonMichel Britten Yves Pouliot |
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Affiliation: | a STELA Dairy Research Center, Institute of Nutraceuticals and Functional Foods (INAF), Pavillon Paul-Comtois, Laval University, Quebec City, QC, Canada G1V 0A6 b Food Research and Development Centre (FRDC), Agriculture and Agri-Food Canada, 3600 Casavant Boulevard West, St-Hyacinthe, Québec, Canada J2S 8E3 |
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Abstract: | The objective of this study was to assess the impact of adding buttermilk concentrate to the denaturation and microparticulation process of cheese whey protein concentrate. For this purpose, the two concentrates were mixed and co-denatured (pH 4.6, 90 °C,) and homogenized. The presence of buttermilk significantly increased aggregation yield and decreased water-holding capacity of aggregates up to a buttermilk:whey protein ratio of 75:25. Modification of rheological properties suggests that denatured whey protein interacted with casein. A thiol blocker, N-ethylmaleimide, was added before heating to measure the role of disulphide bond formation in the aggregation process. Results showed that both covalent and non-covalent interactions were involved in aggregate formation. Ultrasound treatment was applied during denaturation process and was shown to influence aggregate formation. It appeared that under increased turbulence and cavitation conditions, aggregation yield was increased and water-holding capacity decreased. |
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Keywords: | k consistency coefficient n flow behavior index WHC water-holding capacity NEM N-ethylmaleimide |
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