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J Agric Food Chem. 2015 Jun 3;63(21):5257-65. doi: 10.1021/acs.jafc.5b00927. Epub 2015 May 22.

Comparison of heat-induced aggregation of globular proteins.

Author information

1
†Laboratory of Food Chemistry, Wageningen University, Bornse Weilanden 9, 6708 WG Wageningen, The Netherlands.
2
§AVEBE, Prins Hendrikplein 20, 9641 GK Veendam, The Netherlands.

Abstract

Typically, heat-induced aggregation of proteins is studied using a single protein under various conditions (e.g., temperature). Because different studies use different conditions and methods, a mechanistic relationship between molecular properties and the aggregation behavior of proteins has not been identified. Therefore, this study investigates the kinetics of heat-induced aggregation and the size/density of formed aggregates for three different proteins (ovalbumin, β-lactoglobulin, and patatin) under various conditions (pH, ionic strength, concentration, and temperature). The aggregation rate of β-lactoglobulin was slower (>10 times) than that of ovalbumin and patatin. Moreover, the conditions (pH, ionic strength, and concentration) affected the aggregation kinetics of β-lactoglobulin more strongly than for ovalbumin and patatin. In contrast to the kinetics, for all proteins the aggregate size/density increased with decreasing electrostatic repulsion. By comparing these proteins under these conditions, it became clear that the aggregation behavior cannot easily be correlated to the molecular properties (e.g., charge and exposed hydrophobicity).

KEYWORDS:

concentration; ionic strength; ovalbumin; pH; patatin; β-lactoglobulin

PMID:
25965109
DOI:
10.1021/acs.jafc.5b00927
[Indexed for MEDLINE]

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