Decomposition Kinetics of Omethoate in Blood / 法医学杂志

Objective To study the decomposition kinetics of omethoate in blood.Methods The acetonitrile precipitated protein was added into the blood, with the chromatographic column of a Waters BEH C18column (2.1 mm×50 mm, 1.7μm), the mobile phase of 5 mmol/L ammonium acetate aqueous solution-methanol, and the gradient elution with a flow rate of 0.3 mL/min and injection volume of 2μL.With electrospray ionization (ESI) source and positive ion detection, qualitative and quantitative analyses were taken using multi-reaction monitoring mode.Omethoate standard was added into blank human blood to the mass concentrations of 0.78, 1.40, 2.30, 4.50, and 7.20μg/mL, and each mass concentration was preserved at 3 temperatures of-20℃, 4℃, and 20℃, respectively.The content of omethoate was detected at different time points (0, 1, 3, 4, 7, 11, 15, 24, 32, 40, 48, 64, 80, 96, and 120 d).Results Different concentrations of omethoate all showed a descended trend in human blood under different temperature conditions.The decomposition in storage environment of-20℃, 4℃, and 20℃was fit to a one-compartment open model with a first-order kinetic process, which could be expressed as Ct=Coe-αt, with the calculated theoretical values of omethoate concentration close to the measured values.Conclusion All concentrations of omethoate are decomposed in the blood, which vary a lot in different preservation conditions.It is suggested that blood samples should be frozen and detected timely in suspected omethoate poisoning cases.

Damage of DNA in Mouse Sperm Cells Induced by Omethoate / 环境与健康杂志

Objective To study the adverse effect of omethoate on DNA in mouse sperm cells in vivo. Single cell gel electrophoresiss (SCGE) or comet assay was used to observe the damage of DNA. Methods 40 male kunming mice were randomly divided into 4 groups and were treated with omethoate by gavage at 0 mg/kg, 0.5 mg/kg, 1 mg/kg and 2 mg/kg respectively, once a day for 35 consecutive days. Results The movement and density of sperms decreased as the dose of omethoate increased, the length of comet tails in group of 1 mg/kg and group of 2 mg/kg was much longer than that in the control, the other indexes of comet assay also showed significant DNA damage. Conclusion Omethoate exposure can induce DNA damage in the sperm cells of male mice.

Effects of penehyclidine hydrochloride on the diaphragm of rats with omethoate poisoning / 中华急诊医学杂志

Objective To study the morphological changes of diaphragm of rats with omethoate poisoning and the protection of penehyclidine hydrochloride.Methods The experimental model of Wistar rats was made by eliac injection ofomethoate,96 rats was divided randomly into four groups in average:the hrinematched control group (Group NO);the omethoate intoxication matched control group (Group PO);atropine and pralidoxime chloride cure group (Group AC); penehyclidine hydrochlofide and pralidoximc chloride cure group (Group PC).The whole blood cholinesterase (ChE) and creatinekinase (CK) activtitise were measured 2 h after poisoning.To observe the morphological changes of diaphragmat different time from 1 to 7 days.Results All the poisoned rats showed that the diaphragmatic histologic damage of the penehyclidine hydrochloride and pralidoxime chloride cure group was slighter than that of atropine cure group.Conclusion A possible reasons of the respiratory muscle paralysis conduced by AOPP was the putrescence of diaphragm muscle fiber, and penehyclidine hydrochloride could definitely protect the diaphragm of rats with omethoate poisoning,and we could deduce that it prevented from intermediate myasthenia syndrome.

Effect of Dichlorvos and Omethoate Exposure on Sperm Abnormality in Mice / 环境与健康杂志

Objective To explore the effect of dichlorvos and omethoate exposure on reproductive cells of male animals and to provide the scientific evidence for the integrated precaution and protective measure of the agricultural byproduct pollution.Methods 42 male Kunming mice were randomly divided into 7 groups,6 in each group.The 6 groups were dichlorvos and omethoate treated groups,the other was the control group.The mice were treated with dichlorvos or omethoate for 21 consecutive days by gavage,dichlorvos doses were at of 5.0,10.0 and 20.0 mg/kg,omethoate doses were at of 2.5,5.0 and 10.0 mg/kg respectively,the mice in the control group were given physiological saline by gavage at the same volume.The changes of frequency on the sperm abnormality were examined after 21 days.Results Compared with the control group,the frequency of the sperm abnormality in each treated group increased significantly(P

Effect of Omethoate on the Activity of Characteristic Enzymes in the Mouse Testicles and the Antagonism of Teapolyphenol / 环境与健康杂志

Objective To study the effect of omethoate on the activity of characteristic enzymes in mouse testicles and the antagonism of teapolyphenol. Methods 80 Kunming male mice were divided into 8 groups, omethoate was given by gavage: the control group given 0.9% NaCl solution, a group given teapolyphenol of 180 mg/kg bw, three groups given omethoate of 1, 2 and 4 mg/kg bw respectively, three groups given teapolyphenol of 180 mg/kg bw and two hours later followed by omethoate of 1, 2 and 4 mg/kg bw respectively. The gavages were conducted for 6 consecutive days. The activities of the characteristic enzymes (AKP, ACP, LDH and LDH-x) in mouse testicles were measured by biochemistry method and variance analysis was done with the SPSS 11.0 software. Results As omethoate dose increased, the body weight and the testicle weight decreased obviously, the activities of AKP, ACP, LDH in mouse testicles significantly increased compared with the control. Given teapolyphenol 2 hours before given omethoate, the significant changes as above did not emerged. Conclusion Teapolyphenol has an antagonism against the adverse effects of omethoate on the activity of characteristic enzymes in mouse testicles.

Effect of Omethoate on DNA in Mice Testicle Cells / 环境与健康杂志

Objective To study the adverse effect of omethoate on DNA in mice testicle cells in vivo.Methods 24 mice were randomly divided to 4 groups:control(no omethoate),1,2 and 4 mg/kg.omethoate was given by gavage one time a day for consecutive 7 days.DNA damage was detected by single cell gel electrophoresiss (SCGE).Results At the concentration of 1,2,4 mg/kg,omethoate induced DNA damage in mice testicle cells in vivo with an obvious dose-effect relationship(r=0.969 5).Conclusion Omethoate may cause DNA damage in mice testicle cells.