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    Polyethyleneimine-treated xanthan beads for prolonged release of diltiazem: in vitro and in vivo evaluation

    The purpose of the study was to develop a multiunit sustained release dosage form of diltiazem hydrochloride using a natural polymer, sodium carboxymethyl xanthan gum and polyethyleneimine (PEI) from a complet...

    Somasree Ray, Sabyasachi Maiti, Biswanath Sa in Archives of Pharmacal Research (2010)