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M. Catarina, et al., “Multimodal Molecular Encapsulation of Nicardipine Hydrochloride by β-Cyclodextrin, Hydroxypropyl-Β-Cyclodextrin and Triacetyl-Β-Cyclo- dextrin in Solution. Structural Studies by 1H NMR and ROESY Experiments,” European Journal of Pharmaceutical Sciences, Vol. 18, No. 5, 2003, pp. 285-296. doi:10.1016/S0928-0987(03)00025-3

has been cited by the following article:

• TITLE: Studies on the Inclusion Behavior of Amphiphilic p-Sulfonatocalix[4]arene with Ascorbic Acid by Spectrofluorometric Titrations

  AUTHORS: Yunyou Zhou, Xueping Ding, Xiaoli Fang, Tao Li, Dongbao Tang, Qin Lu

  KEYWORDS: P-Sulfonatocalix[4]Arene, Ascorbic Acid, Fluorescence Spectrometry, Inclusion Interaction

  JOURNAL NAME: Optics and Photonics Journal, Vol.1 No.2, June 29, 2011

  ABSTRACT: The aqueous solution of tetrabutyl ether derivatives of p-sulfonatocalix[4]arene (SC4Bu) and ascorbic acid (AA) complex has been studied based on fluorescence and 1H NMR spectroscopic results. It was found that the fluorescence intensity of SC4Bu quenched regularly upon the addition of AA. A 1:1 stoichiometry for the complexation was established and was verified by Job’s plot. The temperature-dependent inclusion constants were calculated, form which Δ H and ΔS values were calculated. Meanwhile the proposed interaction mechanism of the inclusion complex was discussed based on 1H NMR results. The various factors (ionic strength, and surfactants) effecting the inclusion process were examined in detail.