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Maltodextrin-anionic surfactant interactions: isothermal titration calorimetry and surface tension study
A Wangsakan1, P Chinachoti, D J McClements
1Biopolymers and Colloids Research Group, Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA.
Journal of Agricultural and Food Chemistry
|October 16, 2001
Summary
Maltodextrin and sodium dodecyl sulfate (SDS) interact exothermically, with one SDS monomer binding per 24 glucose units. No phase separation or transitions occurred, leading to a phase diagram for these surfactant-polysaccharide interactions.
Area of Science:
- Colloid and Surface Science
- Polymer Chemistry
- Physical Chemistry
Background:
- Surfactant-polysaccharide interactions are crucial in various applications.
- Understanding these interactions informs formulation development.
- Maltodextrin and sodium dodecyl sulfate (SDS) are common model compounds.
Purpose of the Study:
- To investigate the binding interactions between maltodextrin (DE=10) and SDS.
- To determine the binding stoichiometry and thermodynamics.
- To characterize the phase behavior and thermal properties of the mixture.
Main Methods:
- Isothermal Titration Calorimetry (ITC) for binding thermodynamics.
- Surface Tension measurements for critical micelle concentration and binding.
- Differential Scanning Calorimetry (DSC) for thermal transitions.
- Turbidity measurements for phase separation detection.
Main Results:
- Exothermic binding of SDS to maltodextrin observed via ITC.
- Binding stoichiometry determined as approximately one SDS monomer per 24 glucose units at saturation.
- Critical surfactant concentration for interaction identified around 0.05 mM SDS.
- No phase separation or thermal transitions observed within the studied concentration and temperature ranges.
- A phase diagram was constructed.
Conclusions:
- SDS and maltodextrin exhibit specific binding interactions.
- The system remains stable and transparent under tested conditions.
- The developed phase diagram provides a framework for understanding SDS-maltodextrin mixtures.