Measurement of Temperature Dependence of Cyclodextrin Binding Constant Using Ultrafiltration
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The temperature dependence of the binding constant <I>K</I><SUB>B</SUB> for cyclodextrin (CD) and nitrophenol (NP) system is investigated using a previously proposed method. The method is based on the selective inclusion property of cyclodextrin (CD) and the selective permeability of the ultrafiltration membrane (UF/m). <I>K</I><SUB>B</SUB> decreases with increasing temperature. Meanwhile, the activation energy of binding (Δ<I>E</I><SUB>T</SUB>) is calculated from the Arrhenius plot and it is a negative value. The absolute values of Δ<I>E</I><SUB>T</SUB> become large in the order of o-, m-, and p-NPs. These values approximately agree with those of other investigators who employed other methods. Furthermore, the forcible binding energy Δ<I>E</I><SUB>F</SUB> is calculated from the pressure (<I>P</I><SUB>d</SUB>), where the rise ratio of rejection (<I>η</I>) begins deviating from the constant value which is measured at lower pressure. Δ<I>E</I><SUB>F</SUB> agrees with Δ<I>E</I><SUB>T</SUB>. The ratio of Δ<I>E</I><SUB>T</SUB> to Δ<I>E</I><SUB>F</SUB> is nearly constant at 7, and independent of pH and the reaction system.
- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 31(4), 640-643, 1998-08
The Society of Chemical Engineers, Japan