The physicochemical parameters during dry heating strongly influence the gelling properties of whey proteins |
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Authors: | Muhammad Gulzar,Valé rie Lechevalier,Saï d Bouhallab,Thomas Croguennec |
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Affiliation: | 1. AGROCAMPUS OUEST, UMR 1253, F-35042 Rennes, France;2. INRA, UMR 1253, F-35042 Rennes, France;3. University of Veterinary and Animal Sciences, Abdul Qadir Jilani Road, Lahore, Pakistan |
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Abstract: | In this study we determined the composition (proportion of native proteins, soluble and insoluble aggregates) and quantified the gelling properties (gel strength and water holding capacity) of pre-texturized whey proteins by dry heating under controlled physicochemical conditions. For this purpose, a commercial whey protein isolate was dry heated at 80 °C (up to 6 days), 100 °C (up to 24 h) and 120 °C (up to 3 h) under controlled pH (2.5, 4.5 or 6.5) and water activity (0.23, 0.32, or 0.52). Gelling properties were quantified on heat-set gels prepared from reconstituted pre-texturized proteins at 10% and pH 7.0. The formation of dry-heat soluble aggregates enhanced the gelling properties of whey proteins. The maximal gelling properties was achieved earlier by increasing pH and water activity of powders subjected to dry heating. An optimized combination of the dry heating parameters will help to achieve better gelling properties for dry heated whey proteins. |
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Keywords: | Dry-heating Whey protein powder pH Water activity Temperature of dry heating Gelling properties |
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