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N-Trimethyl Chitosan Chloride as a Potential Absorption Enhancer Across Mucosal Surfaces: In Vitro Evaluation in Intestinal Epithelial Cells (Caco-2)

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Abstract

Purpose. Previous studies have established that chitosan hydrochloride and glutamate are potent absorption enhancers for large hydrophilic compounds across mucosal surfaces. However, these compounds lack solubility at neutral pH values. A partially quaternized and well-soluble derivative of chitosan, N-trimethyl chitosan chloride, was synthesized and the effects of this polymer on the transepithelial electrical resistance and permeability of intestinal epithelial cells were investigated in vitro.

Methods. N-trimethyl chitosan chloride was synthesized by reductive methylation and characterized with NMR. The effect of this polymer (1.0−2.5% w/v) on the transepithelial electrical resistance of intestinal epithelial cells, using Caco-2 cell monolayers, was investigated. Permeation of the hydrophilic model compounds [l4C]-mannitol (MW 182.2), FITC-Dextran (MW 4400) and the peptide drug buserelin (MW 1299.5), in the presence of N-trimethyl chitosan chloride (1.5−2.5% w/v), was followed for 3 hours. The transport process of the fluorescent marker, FITC-Dextran 4400, across the cell monolayers was visualised with confocal laser scanning microscopy. Viability of the cells was checked with the trypan blue exclusion technique.

Results. N-trimethyl chitosan chloride was found to be a perfectly water-soluble, partially quaternized (about 12%) derivative of chitosan. This polymer (1.5−2.5% w/v) caused a pronounced and immediate reduction (25−85%) in the transepithelial electrical resistance of Caco-2 cells. Large increases in the transport rate of [!4C]-mannitol (32−60 fold), FITC-Dextran 4400 (167−373 fold) and buserelin (28−73 fold) were demonstrated. Confocal laser scanning microscopy confirmed that N-trimethyl chitosan chloride opens the tight junctions of intestinal epithelial cells to allow increased transport of hydrophilic compounds through the paracellular transport pathway. No deleterious effects to the cells could be demonstrated with trypan blue.

Conclusions. The potential use of N-trimethyl chitosan chloride as an absorption enhancer across mucosal surfaces could be an important contribution towards the development of effective delivery systems for hydrophilic drugs.

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Authors and Affiliations

  1. Department of Pharmaceutics, Potchefstroom University for Christian Higher Education, Potchefstroom, 2520, Republic of South Africa

    Awie R Kotzé

  2. Department of Pharmaceutical Technology, Leiden/Amsterdam Center for Drug Research, Leiden University, 2300, RA Leiden, The Netherlands

    Awie R Kotzé, Henrik L. Lueβen, Bas J. de Leeuw, J. Coos Verhoef & Hans E. Junginger

  3. Department of Pharmacology, Leiden/Amsterdam Center for Drug Research, Leiden University, 2300 RA, Leiden, The Netherlands

    (A)Bert G. de Boer

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  1. Awie R Kotzé
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  2. Henrik L. Lueβen
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  3. Bas J. de Leeuw
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Kotzé, A.R., Lueβen, H.L., de Leeuw, B.J. et al. N-Trimethyl Chitosan Chloride as a Potential Absorption Enhancer Across Mucosal Surfaces: In Vitro Evaluation in Intestinal Epithelial Cells (Caco-2). Pharm Res 14, 1197–1202 (1997). https://doi.org/10.1023/A:1012106907708

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