Abstract
The characterization of binary and ternary complexes of benzoate, lauryl hexaoxyethylene (C12E6) and β-CD is presented. The complexation equilibrium was characterized by UV-Vis spectrophotometry, titration microcalorimetry, capillary electrophoresis, and 2D ROESY 1H-NMR. Results suggested that β-CD forms one complex with C12E6in the stoichiometric ratio of β-CD : C12E61.5 : 1, with a stability constant 1.3 × 105 M-1.5. The 2-D ROESY 1H-NMR spectrum indicated that C12E6is included inside the β-CD cavity. The primary binding site of C12E6 is on the lauryl subunit of this molecule. Analogous to a previously reported study of α-CD, the combination of β-CD and C12E6precipitated from the solution. Addition of benzoate seemed to dissolve the precipitate and nearly doubled the apparent stability constant of the complex. Results from the various techniques supported formation of ternary complexes between β-CD, C12E6, and benzoate.
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Schneiderman, E., Perly, B., Brooks, E. et al. Binary and Ternary Complexes Between Lauryl Hexaoxyethylene, Benzoate and Cyclodextrin. Part II. β-CD. Journal of Inclusion Phenomena 43, 43–50 (2002). https://doi.org/10.1023/A:1020411511591
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DOI: https://doi.org/10.1023/A:1020411511591