Synthesis and characterization of centhaquin and its citrate salt and a comparative evaluation of their cardiovascular actions.
Centhaquin is a compound that produces hypotension and bradycardia in higher doses and resuscitation in lower doses. It is water insoluble, and is unsuitable for intravenous use. We prepared the citrate salt of centhaquin and evaluated its cardiovascular efficacy vs. centhaquin. Centhaquin citrate was prepared and characterized; its purity was determined by HPLC. Mean arterial pressure (MAP), heart rate (HR), pulse pressure (PP), cardiac output (CO), stroke volume (SV) and stroke work (SW) following intravenous administration of centhaquin and the citrate (0.05, 0.15 and 0.45 mg.kg(-1)) were determined in anaesthetized male Sprague-Dawley rats. Centhaquin citrate was 99.8% pure and water soluble. Centhaquin (0.05, 0.15 and 0.45 mg.kg(-1)) produced a maximal decrease in MAP of 15.6, 25.2 and 28.1%, respectively; while centhaquin citrate produced a greater (p<0.001) decrease of 35.7, 47.1 and 54.3%, respectively. The decrease in PP and HR produced by the citrate was greater than centhaquin (p<0.001). At 0.45 mg.kg(-1) centhaquin produced a maximal decrease of 20.9% (p<0.01) in CO, while centhaquin citrate produced a decrease of 42.1% (p<0.001). Reduction in SV (p<0.01) and SW (p<0.001) produced by centhaquin citrate were greater than centhaquin. Centhaquin citrate has greater cardiovascular activity compared to centhaquin.
Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
M S J
MS
Reniguntala
Pharmazz Research Center, Pharmazz India Private Limited, Greater Noida, UP, India.
M S
MS
Lavhale
Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
S V
SV
Andurkar
Department of Pharmaceutical Sciences, Midwestern University Chicago College of Pharmacy, Downers Grove, IL, USA.
A
A
Gulati
D000818:Animals; D002951:Citrates / Q000138:chemical synthesis / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D006439:Hemodynamics / Q000187:drug effects*; D008297:Male; D010879:Piperazines / Q000138:chemical synthesis / Q000494:pharmacology*; D051381:Rats
D002951:Citrates; D010879:Piperazines; C045913:centhaquine