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2013年 第7卷 第1期

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《化学科学与工程前沿（英文）》 >> 2013年 第7卷 第1期 doi: 10.1007/s11705-013-1308-7

Effects of a structurally related substance on the crystallization of paracetamol

1. Department of Chemical Engineering, Loughborough University, Loughborough, LE11 3TU, UK; 2. School of Chemical Engineering, Purdue University, West Lafayette, Ind. 47907, USA

发布日期： 2013-03-05
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Paracetamol (PCM) was crystallized from an isopropanol (IPA) solution containing various small amounts of metacetamol as an additive. The effect on the nucleation kinetics was studied by measuring the induction time to nucleation and the metastable zone width using focused beam reflectance measurements (FBRM) and attenuated total reflectance (ATR-UV/Vis) spectroscopy. Both the induction time and the metastable zone width were expressed as functions of the additive concentration. Small amounts of metacetamol (1–4 mol-%) were found to cause significant inhibition to the nucleation by extending both the induction time and the metastable zone width. A progressive change in the morphology of the paracetamol crystals from tabular to columnar habit was observed with increasing metacetamol concentration. The solvent also had a significant effect on the size of the paracetamol crystals as smaller crystals were obtained in IPA than in aqueous solution. The dissolution rate of paracetamol was improved by the incorporation of metacetamol with 4 mol-% having the most effect. A supersaturation control (SSC) approach was implemented for the PCM-IPA system with and without metacetamol in an attempt to control and obtain larger metacetamol-doped paracetamol crystals.

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