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Equilibrium and release properties of hyaluronic acid–drug complexes

European Journal of Pharmaceutical Sciences, ISSN: 0928-0987, Vol: 49, Issue: 4, Page: 588-594
2013
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Article Description

With the aim to provide more rational basis about the potentiality of hyaluronic acid (or hyaluronan) as drug carrier a set of ionic complexes of its acid form (HA) and its sodium salt (NaHA) with three model drugs (D) (atenolol, propranolol and lidocaine) were prepared. Besides NaHA subjected to hyalurodinase depolimerization (NaHA d ) was also used. Transparent dispersions were obtained. They exhibited negative electrokinetic potential and a high degree of counterionic condensation with affinity constants (log K cc ) in the range of 5.8–6.1 for propranolol complexes (p K a 9.45) and 4.0–4.6 for lidocaine ones (p K a 7.92).

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