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European Food Research and Technology : Volume 242, Issue 7, July 2016

European Food Research and Technology : Volume 224

New controlled release material: aerated egg white gels induced by calcium ions

Content Provider	Springer Nature Link
Author	Tomczyńska Mleko, Marta Handa, Akihiro Wesołowska Trojawska, Marta Terpiłowski, Konrad Kwiatkowski, Cezary Mleko, Stanisław
Copyright Year	2016
Abstract	The aim of the research was to use low-mineral egg white albumin isolate to obtain aerated calcium ion-induced gels and to investigate their aptitude as matrices for active ingredients release. Aerated gels were prepared by adding calcium ions to pre-heated protein dispersions with simultaneous aeration. 20 mM calcium concentration was an optimal concentration at which the maximum viscosity and hardness of the gels were found. For higher concentrations of calcium ions (25–30 mM), aerated gels were characterized by lower values of the moduli and tangent of the phase angle was larger for aerated gels which indicated more viscous character than that of non-aerated gels. Increased ions concentration causes higher aggregation of protein matrix and less smooth microstructure of the interface between the gel and air. An increase in calcium concentration from 5 to 30 mM caused an increase in an average bubble size. The release of calcium ions from aerated gels was measured in an artificial stomach. It occurred by Fickian diffusion through the swelling matrix and it was faster for the gels with higher concentration of calcium. An increase in calcium concentration caused an increase in surface roughness of the aerated gels. There were linear correlations between the quadratic mean of the surface roughness and “n” coefficient from the Ritger and Peppas equation and between the maximum roughness size and “n”. The increased calcium concentration made the gel microstructure more particulate and the surface rougher, which enabled faster proteolysis of the gel in an artificial stomach and faster diffusion of calcium ions.
Starting Page	1235
Ending Page	1243
Page Count	9
File Format	PDF
ISSN	14382377
Journal	European Food Research and Technology
Volume Number	242
Issue Number	8
e-ISSN	14382385
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aerated Egg white Gel Release Microstructure Surface properties Rheology Food Science Analytical Chemistry Biotechnology Agriculture Forestry
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Chemistry Biochemistry Food Science Biotechnology

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