Molecules 2013, 18(6), 6734-6747; doi:10.3390/molecules18066734
Article

Eudragit® L100/N-Trimethylchitosan Chloride Microspheres for Oral Insulin Delivery

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Received: 3 April 2013; in revised form: 29 May 2013 / Accepted: 31 May 2013 / Published: 7 June 2013
(This article belongs to the Special Issue Chitins and Chitosans)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Effective oral delivery of protein and peptide drugs remains an active topic in scientific research. In this study, matrix type microspheres were prepared with Eudragit® L100 containing N-trimethylchitosan chloride to improve the permeation of insulin across the intestinal epithelium via the paracellular pathway. Insulin loaded microspheres were initially formulated in accordance with a factorial design (23) and manufactured by means of a single water-in-oil emulsification/evaporation method. Based on external and internal morphology two microsphere formulations were selected from the initial formulations for further investigation in terms of particle size, dissolution behaviour and in vitro insulin transport across excised rat intestinal tissue. The initial eight microsphere formulations exhibited drug loading capacities ranging from 27.9–52.4% with different shapes and internal structures. The two selected microsphere formulations had average particle sizes of 157.3 ± 31.74 µm and 135.7 ± 41.05 µm, respectively, and mean dissolution time values for insulin release of 34.47 and 42.63 min, respectively. In vitro transport of insulin across excised rat intestinal tissue from the two selected microsphere formulations was 10.67–fold and 9.68–fold higher than the control group (insulin alone). The microsphere delivery system prepared from Eudragit® L100 containing N-trimethylchitosan chloride is therefore a promising candidate for effective oral insulin delivery.
Keywords: Eudragit® L100; insulin; microspheres; N-trimethylchitosan chloride; oral peptide delivery; paracellular transport
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MDPI and ACS Style

Marais, E.; Hamman, J.; Plessis, L.D.; Lemmer, R.; Steenekamp, J. Eudragit® L100/N-Trimethylchitosan Chloride Microspheres for Oral Insulin Delivery. Molecules 2013, 18, 6734-6747.

AMA Style

Marais E, Hamman J, Plessis LD, Lemmer R, Steenekamp J. Eudragit® L100/N-Trimethylchitosan Chloride Microspheres for Oral Insulin Delivery. Molecules. 2013; 18(6):6734-6747.

Chicago/Turabian Style

Marais, Etienne; Hamman, Josias; Plessis, Lissinda D.; Lemmer, Righard; Steenekamp, Jan. 2013. "Eudragit® L100/N-Trimethylchitosan Chloride Microspheres for Oral Insulin Delivery." Molecules 18, no. 6: 6734-6747.

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