Katta Jyothi, Rasmuson Ake C
Department of Chemical Engineering and Technology, Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden.
Int J Pharm. 2008 Feb 4;348(1-2):61-9. doi: 10.1016/j.ijpharm.2007.07.006. Epub 2007 Jul 10.
This paper deals with the development of a method for spherical crystallization of benzoic acid. Benzoic acid is dissolved in ethanol, water is used as anti-solvent and chloroform is used as bridging liquid. After an introductory screening of different methods, the influence of the amount of the bridging liquid, the solute concentration and the stirring rate is investigated. The product particle characterization includes the particle size distribution, morphology and strength. The mechanical strength of single agglomerates has been determined by compression in a materials testing machine, using a 10N load cell. It is found that favourable properties are obtained if the bridging liquid is added during the crystallization. Larger and stronger well-shaped agglomerates are formed. The stress-strain curves are J-shaped with no clear fracturing of the particles, and are well correlated by an exponential-polynomial equation.
本文论述了苯甲酸球形结晶方法的开发。苯甲酸溶解于乙醇中,水用作反溶剂,氯仿用作桥连液。在对不同方法进行初步筛选后,研究了桥连液用量、溶质浓度和搅拌速率的影响。产物颗粒表征包括粒度分布、形态和强度。单个团聚体的机械强度通过在材料试验机中使用10N测力传感器进行压缩来测定。发现如果在结晶过程中加入桥连液可获得良好的性能。形成了更大、更强且形状良好的团聚体。应力-应变曲线呈J形,颗粒无明显破裂,并且可用指数-多项式方程很好地关联。