Biopolymers / 2

April 3, 2017 | Physical Chemistry | By admin | 0 Comments

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In related work, Kondo and coworkers have emphasized the use of carboxymethyl chitin to produce artificial red blood cells [429-435]. Seki and Tirrell [436] studied the pH-dependent complexation of poly(acrylic acid) derivatives with phospholipid vesicle membranes. These authors found that poly(acrylic acid), poly(methacrylic acid) and poly(ethacrylic acid) modify the properties of a phospholipid vesicle membrane. At or below a critical pH the polymers complex with the membrane, resulting in broademng of the melting transition.

1 Polyelectrolytes and Binders in Controlled Release Coatings, Matrices Enteric coatings were among the earliest biomedical applications of polyelectrolytes. In this relatively simple application, a drug-containing core is coated with a pH-sensitive polymer which protects the core from the degradative action of the low gastric pH. In the relatively basic environment of the small intestine, however, erosion of the coating is activated and the resulting polymer membrane controls drug release [273-277].

For example xanthan gum was crosslinked with epichlorohydrin and its swelling properties were correlated with crosslinking [317]. These hydrogels were loaded with theophylline, isosorbite dinitrate or methoxyprogesteron by diffusion, while neomycin was linked to the xanthan, and furazolidone was incorporated into the neomycin derived gel. Zero order release kinetics were observed for neomycin and furazolidone. Similarly, crosslinked chondroitin sulfate matrices were investigated for controlled release of indomethacin in the colon [318].

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