Acute toxic effects of three pesticides on Pseudomonas putida monitored by microcalorimeter

作者：Chen, Hui-Lun; Yao, Jun^*; Wang, Fei; Bramanti, Emilia; Maskow, Thomas; Zaray, Gyula

来源：Journal of Environmental Science and Health - Part B: Pesticides, Food Contaminants, and Agricultural Wastes , 2009, 44(2): 157-163.

DOI：10.1080/03601230802599084

• Microcalorimetry
• toxic effect
• beta-cypermethrin
• bensulfuron-methyl
• prometryne

A series of calorimetric experiments were performed to investigate the toxic effects of beta-cypermethrin (BCP), bensulfuron-methyl (BSM) and prometryne (PM) on Pseudomonas putida (P. putida). The metabolic action of P. putida on the three pesticides was studied by obtaining power-time curves. The growth of P. putida was inhibited completely in each case when the concentrations of pesticides were up to 80 g mL- 1. The relationships between the inhibitory ratio (k) and doses of contaminants were approximately linear for the three pesticides. The total heat dissipated per milliliter (Qtotal) for the pesticides decreased during the course of the experiment. The OD600 of P. putida growth in the absence and presence of pesticides was also obtained. The power-time curves of P. putida growth coincided with its turbidity curves. This elucidates that microcalorimetric method agrees well with the routine microbiological method. Among these three pesticides, BSM was found to be the most toxic with an IC50 of 19.24 g mL- 1 against P. putida. PM exhibited moderate virulence with an IC50 of 27.86 g mL- 1 and BCP had the lowest toxicity with an IC50 of 39.64 g mL- 1.

• 出版日期2009
• 单位生物地质与环境地质国家重点实验室; 中国地质大学（北京）