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Both solutes were used in the ion exchange/exclusion studies. Acetaminophen (151 Da) is a nonionic solute used in the nonionic interaction studies. Ovalbumin (45000 Da) is a model protein used to test the enhanced loading concept developed for proteins. Technique. Studies of solute interactions, enhanced loading concept, and release kinetics were performed in the same general manner. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1999. 47 soaked in a pretreatment solution which, for example, may put a polyelectrolyte gel in its acidic form.

In Hydrogels in Medicine and Pharmacy, Vol. 1; Peppas, Ν. ; CRC Press: Boca Raton, FL, 1986; 28-55. 23. ; Immergut, Ε. H. , 1989. 24. Crank,J. The Mathematics of Diffusion; Oxford University Press: Oxford,1956. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1999. Chapter 4 Gel-Coated Catheters as Drug Delivery Systems 1 Stevin H. Gehrke , John P. Fisher, James F. McBride, Stephen M . O'Connor, and Huajie Zhu Department of Chemical Engineering, ML 0171, University of Cincinnati, Cincinnati,OH45221-0171 Commercially available poly(ethylene oxide) [PEO] and poly (acrylic acid) [PAA] gel-coated balloon angioplasty catheters are investigated for their use as local drug delivery systems in terms of gel/solute interactions, solute loading, and release kinetics.

Samples were taken at fixed intervals and the drug concentrations were determined using a U V spectrophotometer. Results and Discussion The ability of a drug to diffuse through a crosslinked polymer network is dependent on the degree to which the gel swells. In pH-responsive, P(MAA-g-EG) hydrogels, the formation of interpolymer complexes resulted in the presence of temporary physical crosslinks due to hydrogen bonding between the PEG grafts and the P M A A pendant groups. Thus, the degree of crosslinking and the effective molecular weight between crosslinks of these systems decreased due to interpolymer complexation in these gels.

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