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HJ Mahdi

Issues in Biological Sciences and Pharmaceutical Research
Vol.3 (2), pp.14-20, February 2015
ISSN 2350-1588
Article ID BSPR008,07 pages
Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License

Original Research Article

Eudragit L-100 for enteric coating of hard gelatine capsules: Formulation and evaluation

Harith Jameel Mahdi

Department of Applied Chemistry, Faculty of Applied Chemistry, University of Samarra, Iraq.

Author’s E-mail:ph_harith75(at)


date Received:     date Accepted: February 27, 2015     date Published:


In an attempt to combine the favourite properties of hard gelatine capsules with the protective and controlled release properties of enteric coating to get an appropriately and acceptably formulated enteric coated hard gelatine capsules with pH dependent drug release characteristic. Two hard gelatine capsule sizes were selected i.e. size #0 and size #1 in order to test the effect of capsule size on coating process. Eudragit L-100, a pH dependent solubility polymer, was tested for suitability for coating of hard gelatine capsules. A number of formulations with various Eudragit L-100 concentrations were investigated in order to select the best formula that provides the most appropriate coating properties. A formulations with 3, 5, 6.5 and 10 % (w/w) Eudragit L-100 were tested. Formula with 6.5 % (w/w) Eudragit L-100 was selected as it provides a good adhered and continuous coating film with acceptable disintegration time, dissolution test and excellent stability on storage for both capsule sizes.

Key words: Hard gelatine capsule, eudragit L-100, enteric coating, direct coating, and sub-coating