Thermal analysis study of amlodipine as pure compound and in binary mixture
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- 作者：1. Research Center for Thermal Analysis in Environmental Problems ; West University of Timisoara ; Pestalozzi Street 16 ; 300115 Timisoara ; Romania2. University of Medicine and Pharmacy 鈥淰ictor Babe艧鈥? Eftimie Murgu Square 2 ; 300041 Timisoara ; Romania
- 关键词：Amlodipine – ; Thermal behavior – ; Evolved gas analysis – ; Kinetics – ; NPK method
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版时间：August 2011
- 出版年：2011
- 期刊代码：82_1388-6150
- 类别：ch
- 卷：105
- 期：2
- 页码：677-683
- 数据来源：sp
摘要
Amlodipine is a very used selective calcium antagonist. The evaluation of thermal stability is crucial for the formulation setting of a solid dosage form. By heating in air under non-isothermal conditions, amlodipine presents two characteristic steps. More details were obtained using IR spectrometric data of the pure compound of the char, respectively, of the evolved gases at those temperatures. Data on a possible interaction between amlodipine and some excipients used in solid dosage forms were obtained by comparison of TG/DTG/DTA curves of amlodipine and of its mixtures with talc (considered thermally inert), magnesium stearate, starch and cellulose. No thermally induced interactions were observed. In order to obtain data for a believable Life Time Prediction a kinetic analysis was performed. The data of the first step of mass loss obtained at four heating rates (7, 10, 12, and 15 掳C min−1, respectively) were processed using at least three different methods. From these, the NPK method seems to be adequate because the separation between the temperature, respective the conversion dependent part of the reaction rate equation and the expression of the formal kinetic equation were obtained in a less speculative manner.