| Abstract
| - Isothermal titration calorimetry (ITC) was used to study interactions between an anionic surfactant(sodium dodecyl sulfate, SDS) and maltodextrins with different dextrose equivalents (DE) in a buffersolution (pH 7.0, 10 mM NaCl, 20 mM Trizma, 30.0 °C). The interaction between SDS and maltodextrinwas exothermic, which was attributed to incorporation of the hydrocarbon tail of the surfactant into ahelical coil formed by the maltodextrin molecules. ITC measurements indicated that the number ofSDS molecules bound per gram of maltodextrin increased with decreasing maltodextrin DE, i.e.,increasing molecular weight. It was proposed that SDS only binds to maltodextrin molecules thathave a DE greater than 10 glucose units. Keywords: Isothermal titration calorimetry; maltodextrin; surfactant; binding
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