ABSTRACT
The proximate composition and time killing kinetics of the leaf and stem extracts of Calotropis procera were carried out. The proximate composition showed moisture content of (10.45 and 9.78%), protein (16.20 and 8.15%), fat (1.99 and 0.96%), ash (14.32 and 6.39%), crude fibre (6.73 and 23.23%) and carbohydrate (49.49 and 51.49%) for leaf and the stem respectively. Twelve pathogenic bacteria and five fungi species were obtained from the Department of Microbiology, Federal University of Technology, Akure, Ondo-State and typed cultures of the organisms were collected from National Institute of Medical Research (American type culture collection centre (ATCC), USA). The time-kill studies are important because comprehensive information about pharmacodynamics of a putative antibacterial agent may not be gained simply through endpoints such as Minimum Inhibitory Concentration. This study is done to examine the time-frame required for the microbes to be killed. It was determined on each isolates with the extracts taken at their Minimum Inhibition Concentration values. The study was evaluated in hours of 0 hr, 6 hrs, 12 hrs, 24 hrs, 48 hrs, 72 hrs and 96 hrs, the methanol leaf extract kill most of the organisms within 24 hrs while aqueous leaf extract was unable to kill most of the organisms under 48 hrs.