Authors: Hammershøj M.¹; Peters L.V.²; Andersen H.J.¹

Source: Journal of the Science of Food and Agriculture, Volume 84, Number 9, July 2004 , pp. 1039-1048(10)

Publisher: John Wiley & Sons, Ltd.

Abstract:

The purpose of the present work was to study the variation in egg albumen functional properties as a function of seven selected processing steps from the initially raw liquid albumen to the final dried egg albumen powder. Albumen samples in six replicates were analysed for dry matter, pH, glucose, triglycerides, albumen gel properties (ie textural stress and Hencky strain, water- and protein-binding capacity and gel colour L*, a*, b*), foaming properties (ie overrun, stability against drainage and bubble breakdown) and surface tension. The gel texture and water-holding capacity significantly decreased during the processing steps from raw albumen through storage, centrifugation and ion exchange, whereas the final dry-pasteurisation resulted in increased gel properties. Covalently linked protein polymers formed during the dry-pasteurisation, as revealed by SDS-PAGE, may explain this improvement. The foam overrun increased twofold during the three final steps of ultrafiltration, spray-drying and dry-pasteurisation compared with the raw albumen; however, the foam stability decreased, ie drainage and foam volume breakdown rates increased. The surface pressure increase was positively correlated with the foam overrun. This paper reveals at which processing steps the control of functional properties of egg albumen powder can take place. Copyright © 2004 Society of Chemical Industry

Keywords: egg albumen; drying; foam; gel; texture; processing; powder; rheology

Document Type: Research article

DOI: http://dx.doi.org/10.1002/jsfa.1772

Affiliations: 1: Department of Food Science, Danish Institute of Agricultural Sciences, POB 50, DK-8830 Tjele, Denmark 2: Sanovo Foods A/S, POB 139, DK-5100 Odense C, Denmark

Publication date: 2004-07-01

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