Competitive Binding of Off-Flavor Compounds with Soy Protein and [Beta]-Cyclodextrin in a Ternary System: A Model Study

Removal of soy protein (SP)-bound 2-nonanone by β-cyclodextrin (βCD) was studied using an equilibrium dialysis technique. It was observed that in the presence of βCD, a significant (p < 0.05) amount of SP-bound 2-nonanone could be removed in a concentration-dependent manner. Up to 94% of SP-bound...

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Bibliographic Details
Published in:Journal of the American Oil Chemists' Society 2010-06, Vol.87 (6), p.673
Main Authors: Arora, Akshay, Damodaran, Srinivasan
Format: Article
Language:English
Subjects:
Aqueous solutions
Carbonyl compounds
Competition
Dialysis
Hemodialysis
Methods
Molecular weight
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Summary:Removal of soy protein (SP)-bound 2-nonanone by β-cyclodextrin (βCD) was studied using an equilibrium dialysis technique. It was observed that in the presence of βCD, a significant (p < 0.05) amount of SP-bound 2-nonanone could be removed in a concentration-dependent manner. Up to 94% of SP-bound 2-nonanone was stripped from SP when 6 mM βCD was present in the system. However, in thermodynamic terms, the net standard free energy change for transfer of 2-nonanone from SP to βCD, i.e., ΔΔG^sup [ring]^^sub SP[arrow right]βCD^, was essentially zero, implying that the apparent equilibrium binding constant for the formation of βCD-2-nonanone complex was essentially same as that for the SP-2-nonanone complex formation in the ternary system. This indicated that stripping-off of 2-nonanone from SP by βCD was driven by the mass action ratio. Based on these results, it is shown that βCD can be used effectively for removing SP-bound off-flavor carbonyl compounds. [PUBLICATION ABSTRACT]
ISSN:0003-021X
1558-9331