Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 498891
Title Modulating the aggregation behaviour to restore the mechanical response of acid induced mixed gels of sodium caseinate and soy proteins
Author(s) Martin, Anneke H.; Los Reyes Jiménez, Marta L. De; Pouvreau, Laurice
Source Food Hydrocolloids 58 (2016). - ISSN 0268-005X - p. 215 - 223.
Department(s) Physics and Physical Chemistry of Foods
FBR Consumer Science & Health
Publication type Refereed Article in a scientific journal
Publication year 2016
Keyword(s) Acidification - Aggregation - Fracture stress - Gel - Sodium caseinate - Soy proteins

Partial replacement of milk proteins with plant proteins is a challenge due to the reported negative effect on physical and sensory properties. Understanding of how the mechanical properties of acidified milk gels can be restored when 30% casein is replaced with soy proteins is therefore explored. Mixtures of sodium caseinate (CAS) and soy proteins (SP) are pre-heated at different conditions (pH, ratio CAS:SP, temperature) prior to acidification with GDL in order to modulate aggregation, structure build-up and final mechanical properties of acidified gels with total protein content of 10% (w/w). Optimal results in mechanical response were obtained when CAS and SP were pre-heated together at a 7:3 protein ratio for 15 min at 95 °C. In addition, heat treatment of CAS-SP mixtures resulted in a shift to higher onset pH and a faster onset gelation as determined by dynamic oscillation rheology. From turbidity measurements a change in aggregation kinetics was observed which can be appointed to the altered aggregation propensity during acidification of the heat induced aggregates. Pre-heating of CAS and SP together resulted in an enhanced increase in aggregate size (as determined with light scattering) compared to unheated mixture or when only SP was heated. By pre-heating mixtures of CAS and SP at the right conditions prior to acidification, the mechanical response of mixed CAS-SP gels can be restored to that comparable with CAS only gels. As a result, 30% CAS can be successfully replaced with SP while maintaining mechanical properties.

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