物理化学学报 >> 2003, Vol. 19 >> Issue (06): 560-563.doi: 10.3866/PKU.WHXB20030617

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Pr3+或La3+与克拉红霉素对大肠杆菌的协同作用

沈雪松;刘义;侯安新;赵儒铭;屈松生   

  1. 武汉大学化学与分子科学学院,武汉 430072;广西桂林医学院,桂林 541001
  • 收稿日期:2002-10-22 修回日期:2002-12-23 发布日期:2003-06-15
  • 通讯作者: 刘义 E-mail:liuyi@public.wh.hb.cn

Thermochemical Studies of the Synergism of Pr3+or La3+ and Clarithromycin on Escherichia coli Growth Metabolism

Shen Xue-Song;Liu Yi;Hou An-Xin;Zhao Ru-Ming;Qu Song-Sheng   

  1. College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072;Guilin Medical College,Guilin 541001
  • Received:2002-10-22 Revised:2002-12-23 Published:2003-06-15
  • Contact: Liu Yi E-mail:liuyi@public.wh.hb.cn

摘要: 用LKB-2277生物活性检测系统采用停流法于37 ℃测定了克拉红霉素及克拉红霉素分别与Pr(NO3)3和La(NO3)3混合后,对大肠杆菌生长抑制作用的热效应变化.根据热动力学模型进行了定量解析,得到了各体系的克拉红霉素浓度c与大肠杆菌生长速率常数k之间关系式及其半抑制浓度Ic50. 克拉红霉素:   k=0.03106-1.273×10-3c Ic50=8.81 μg•mL-1  (0.5~20 μg•mL-1) 克拉红霉素+Pr3+: k=0.02967-1.332×10-3c Ic50=7.38 μg•mL-1   (1~15 μg•mL-1) 克拉红霉素+La3+: k=0.02741-1.194×10-3c Ic50=6.34 μg•mL-1  (1~15 μg•mL-1) 微量热结果不仅表征了克拉红霉素的抗菌活性强于红霉素,Pr3+或La3+与克拉红霉素协同作用也使抗菌活性增强,而且反映了不同药物作用下细菌的生理、生化和代谢过程热动力学特征的变化.

关键词: Pr3+, La3+, 克拉红霉素, 红霉素, 大肠杆菌, 热化学

Abstract: Using 2277 bioactivity monitoring system,we determined the changes of heat effect of inhibition of Clarithromycin with Pr(NO3)3 or La(NO3)3 on Escherichia coli growth at 37 ℃.According to the thermokinetic model,the relationship between the concentration of antibiotics (c) and growth rate constant (k) and its half inhibitory concentration,Ic50,were analyzed quantitatively. Clarithromycin: k=0.03106-1.273×10-3c Ic50=8.81 μg•mL-1 (0.5~20 μg•mL-1) Clarithromycin+Pr3+: k=0.02967-1.332×10-3c Ic50=7.38 μg•mL-1 (1~15 μg•mL-1) Clarithromycin+La3+: k=0.02741-1.194×10-3c Ic50=6.34 μg•mL-1 (1~15 μg•mL-1)   The results of microcalorimetry experiments not only indicated that antibacterial activity of Clarithromycin was stronger than that of erythromycin,but also the changeable features of thermokinetics of the bacterial cell in biological,biochemical and metabolic process under the action of different drugs.

Key words: Pr3+, La3+, Clarithromycin, Erythromycin,  Escherichia coli, Thermochemistry