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Extra resources for Biopolymers / 2
3C, when the glucose level falls the polymer gel shrinks to its original size, waterfillsthe center chamber and the system is ready for a second application. Kabra and Gehrke  also discuss hydrogel-driven osmotic pumps in which a drug and a hydrogel are encapsulated by a semipermeable membrane. The release of insoluble drugs through an orifice in the membrane was enhanced by swelling of the hydrogel. A number of investigators have devised polyelectrolyte controlled release systems which respond to an externally applied electrical signal.
Scranton et al. A strong molecular weight dependence was observed  with low molecular weight (12000) PEAA behaving differently than polymers of higher molecular weight (43000 and 164000). Finally, quasi-elastic light scattering and electrophoretic light scattering measurements  demonstrated that a reorganization of the vesicles does occur upon reduction in pH, and is accompanied by a substantial reduction in vesicle size , as shown in Fig. 4. It was suggested that as the pH was lowered, the collapsed PEAA chains provided hydrophobic sites for stabilization of hydrocarbon tails resulting in disruption of the structural organization of the phospholipids.
One of the most established uses of polyelectrolytes as active ingredients in pharmaceuticals is the application of ion exchange resins for lowering serum cholesterol ("Cholestyramine" drugs). Although this technology is not new, patent and literature activity in this area continues. Polyelectrolytes have also been studied as polymeric prodrugs. This area was recently reviewed in detail , and only a brief summary will be presented here. In particular, water dispersible polymeric anticancer prodrugs containing the active group methacryloyloxyethyl 5 fluoroacil (MAFU) and ionic acrylic, methacrylic acid or maleic acid functional groups were recently reviewed .
Biopolymers / 2