کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
215973 1426250 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Interaction of cephalosporin drugs with dodecyltrimethylammonium Bromide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Interaction of cephalosporin drugs with dodecyltrimethylammonium Bromide
چکیده انگلیسی


• We carry out the interaction of cephalosporin drugs with DTAB conductometrically.
• We examine the effect of drugs on the critical micelle concentration of DTAB.
• Three critical micelle concentrations are obtained for drug- DTAB system.
• Electrostatic and hydrophobic interactions between drugs and DTAB are proposed.
• Drug supported micelle formation of DTAB is much favoured in aq. solution of K2SO4.

The interaction of three cephalosporin drugs namely cefadroxyl monohydrate (CFM), cephalexin monohydrate (CLM) and cephradine monohydrate (CDM) with dodecyltrimethylammonium Bromide (DTAB) has been carried out by conductance measurements in aqueous medium and in aqueous solution of K2SO4 salt over temperature range of (303.15 to 318.15) K. For pure DTAB and drug-DTAB systems, three critical micelle concentrations were obtained. The third critical micelle concentration (c∗3) indicates that the spherical micelle turns into rod shape that is sphere to rod transition. The c∗ values of DTAB are changed due to the addition of cephalosporin drugs. In addition, the change of the values of c∗1, c∗2 and c∗3 with increase of the concentration of drugs indicate the presence of interaction between drug and DTAB. The c∗ values indicate that micellization for the cephalosporins-surfactant systems in water follow the order: CFM-surfactant < CDM-surfactant < CLM-surfactant. The c∗ values for the cephalosporins - DTAB systems in aqueous K2SO4 are lower in magnitude than those in pure water and the values decrease with increase of the concentrations of K2SO4 at a particular temperature. A significant decrease of c∗ values in the presence of K2SO4 for cephalosporins-DTAB systems indicates that drug supported ionic micelle formation is much favoured in aqueous K2SO4 solution compared to that in pure water. For cephalosporin-DTAB systems, ΔG0m values are negative which indicate that the drugs mediated ionic micelle formation processes are thermodynamically spontaneous. For cephalosporin-DTAB systems in water, the micellization is almost entropy controlled whereas at some temperatures it becomes both entropy and enthalpy controlled. Enthalpy–entropy compensation is observed from a linear relation between enthalpy and entropy changes in all the cases.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Chemical Thermodynamics - Volume 63, August 2013, Pages 135–141
نویسندگان
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