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The investigation of dissolution failures for erythromycin dihydrate tablet formulation over a 12-month period using a near-infrared spectroscopy technique revealed the role of a desolvated dihydrate in the retardation of dissolution. Near infrared spectroscopy (NIR) indicated a dehydrated dihydrate of erythromycin is produced during formulation and gradually binds with Mg(OH)2. The binding delays the process of dissolution. NIR was used to successfully predict that humidifying the tablets would reverse the binding and increase the dissolution rate.
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Bauer et al. (1999) studied this question.
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