Whey Protein/Arabic Gum Gels Formed by Chemical or Physical Gelation Process

Whey proteins (WP) gelation process with addition of Arabic gum (AG) was studied. Two different driving processes were employed to induce gelation: (1) heating of 12% whey protein isolate (WPI) solutions (w/w) or (2) acidification of previous thermal denatured WPI solutions (5% w/w) with glucono-δ-l...

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Bibliographic Details
Published in:Food biophysics 2009-03, Vol.4 (1), p.23-31
Main Authors: Valim, Melina D, Cavallieri, Angelo L. F, Cunha, Rosiane L
Format: Article
Language:English
Subjects:
Acidification
Analytical Chemistry
Biochemistry
Biological and Medical Physics
Biophysics
Biopolymers
BST equation
Chemistry
Chemistry and Materials Science
Cold-set gels
Food Science
Gelation process
Gels
Heat-set gels
Heating
mechanical properties
Milk
Original Article
Proteins
Strain
Stress-strain curves
Studies
Whey proteins
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Summary:Whey proteins (WP) gelation process with addition of Arabic gum (AG) was studied. Two different driving processes were employed to induce gelation: (1) heating of 12% whey protein isolate (WPI) solutions (w/w) or (2) acidification of previous thermal denatured WPI solutions (5% w/w) with glucono-δ-lactone (GDL). Protein concentrations were different because they were minimal to form gel in these two processes, but denaturation conditions were the same (90 °C/30 min). Water-holding capacity and mechanical properties of the gels were evaluated. The BST equation was used to evaluate the nonlinear part of the stress-strain data. Cold-set gels were weaker than heat-set gels at the pH range near the isoelectric point (pI) of the main whey proteins, but heated gels were more deformable (did not exhibit rupture point) and showed greater elasticity modulus. However, gels formed by heating far from the pI (pH 6.7 or 3.5) showed more fragile structure, indicating that, in these mixed gels, there are prevailing biopolymers interactions. Cold-set and heat-set gels at pH near or below the WP pI showed strain-weakening behavior, but heated gels at neutral pH showed strong strain-hardening behavior. Such results suggest that differences in stress-strain curve at the nonlinear part of the data could be correlated to structure particularities obtained from different gelation processes.
ISSN:1557-1858
1557-1866
DOI:10.1007/s11483-008-9098-z