Journal
COLLOIDS AND SURFACES B-BIOINTERFACES
Volume 171, Issue -, Pages 530-537Publisher
ELSEVIER
DOI: 10.1016/j.colsurfb.2018.07.061
Keywords
beta-carboline-Drug; Cucurbit[n]uril; Surfactants; Acid-base properties; Solubility-enhancement; Drug-delivery
Funding
- Science and Engineering Research Board under Department of Science and Technology (DST), India [SERB/CS-253/2013]
- IISERB
- CSIR
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The effect of supramolecular nanocavity on photophysical and acid-dissociation properties of Norharmane (NHM), a physiologically important, anxiety control and memory-enhancing beta-carboline-based drug, has been investigated using steady-state absorption and fluorescence spectroscopy. Self-assembled organization derived from surfactants and rigid water-soluble macrocyclic host Cucurbit[7]uril (CB7) have been selected for this investigation. The confined-space offered by the supramolecular assemblies modulates the pK(a) value of NHM (up to 3 units) as it can exist in two protolytic forms at near neutral pH. Therefore, the pH-dependent binding properties, modulation of pK(a) value and its consequences on the photophysical, chemical and solubility properties are investigated in detail. This investigation shows a large shift in the protolytic equilibrium which in turn causes ca. 15 times solubility-enhancement at near neutral pH. Moreover, the effect of enhanced solubility has been further investigated by the augmentation in the cellular uptake of NHM entrapped inside CB7. Thus, the modulation of the acid-base properties and solubility of beta-carboline-based drugs will have immense potential for their formulation, cellular uptake and bioavailability.
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