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J Pharm Sci ; 100(3): 874-85, 2011 Mar.
Article in English | MEDLINE | ID: mdl-20803617

ABSTRACT

With a view to the application in oral controlled drug delivery systems (DDS), the design of new interpolyelectrolyte complexes (IPECs) between countercharged types of Eudragit EPO (EPO) and Eudragit L 100-55 (L100-55) was investigated. The formation and composition of four new IPECs between EPO and L100-55 were established by elementary analysis. The structure of the synthesized IPEC was investigated using FTIR spectroscopy and modulated-temperature differential scanning calorimetry. The binding ratio of a unit molecule of EPO with L100-55 was found to range between 1:2.75 (Z = 0.36) and 1:0.55 (Z = 1.81) while increasing the pH value from 5.5 to 7.0. As a result of electrostatic interaction between the copolymer chains, the glass transition temperature of the IPEC increased significantly. A large pH-sensitive swelling behavior was observed for different structures of the IPECs. The outcome of swelling and diclofenac sodium release from the polycomplex matrices confirm that they have great potential to be used as a controlled DDS in specified regions of gastrointestinal tract.


Subject(s)
Acrylic Resins/chemistry , Anti-Inflammatory Agents, Non-Steroidal/chemistry , Diclofenac/chemistry , Drug Delivery Systems , Polymethacrylic Acids/chemistry , Administration, Oral , Anti-Inflammatory Agents, Non-Steroidal/administration & dosage , Anti-Inflammatory Agents, Non-Steroidal/metabolism , Delayed-Action Preparations , Diclofenac/administration & dosage , Diclofenac/metabolism , Drug Carriers , Hydrogen-Ion Concentration , Molecular Structure , Polymers/chemistry , Solubility , Static Electricity , Transition Temperature
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