伊維菌素微乳在羊體內(nèi)的藥代動力學(xué)與殘留研究
[Abstract]:In this paper, the pharmacokinetic characteristics and drug residue elimination of a new Ivermectin microemulsion in sheep were studied. A new method for the determination of the concentration of ivermectin microemulsion in sheep plasma was established. The pharmacokinetic characteristics of ivermectin microemulsion in sheep were analyzed. A new method for determination of Ivermectin microemulsion in different tissues of target animal sheep was established. The law of its elimination in different tissues was obtained, and the withdrawal period of ivermectin microemulsion was established. The pharmacokinetic test of ivermectin microemulsion was carried out. A method for the determination of drug concentration in plasma by high performance liquid chromatography-tandem mass spectrometry (HPLC / MS) was established. The results showed that the pretreatment method was simple and effective, and the minimum quantitative limit was 0.5 ng / mL. The lowest detection limit was 0.3 ng 路mL ~ (-1), the linearity of the standard curve was good, R2 was 0.9995, the average recovery was more than 90, the intra-day precision and inter-day precision were less than 10, the sensitivity was high, the interference was small, and the repeatability was good. The AUC of the subcutaneous administration group was 1343.07 鹵101.17 h ng/mL, peak concentration (Cmax) was 50.61 鹵2.96 ng / mL, and the peak time Tmax was 7.14 鹵0.80 h. Absorption half life T 1 / 2 (偽) was 4.46 h, elimination half life T 1 / 2 (尾) was 25.45 h; In the intramuscular administration group, AUC was 1814.24 鹵56.06 h, Cmax was 70.34 鹵1.89 ng / mL, Tmax was 3.99 鹵0.20, absorption half life T 1 / 2 (偽) was 4.52 h, elimination half life T 1 / 2 (尾) was 20.08 h. The absolute bioavailability of ivermectin microemulsion by intramuscular injection and subcutaneous injection was 91.33% and 67.62%, respectively. It was found that intramuscular injection had higher peak concentration, faster peak time and higher bioavailability than subcutaneous injection. A method for the determination of ivermectin residues in sheep tissues by HPLC-tandem mass spectrometry (HPLC-MS) was established by the drug residue elimination test of ivermectin microemulsion. The samples were extracted by acetonitrile and purified by alkaline alumina solid phase extraction column. The results showed that the peak area of ivermectin matrix matching standard curve was linear in the range of 1~3000ng/mL concentration, and R2 was greater than 0.999. In neck muscle, kidney, fat, longissimus dorsi muscle and liver, the minimum detection limit is 0.3 ng / mL, and the minimum quantitative limit is 0.5 ng / mL. the quantitative limit of this method is lower than that of the European Union. Ivermectin residue limits in the United States and China. The average recovery of the sample was more than 70 and the intra-day precision and inter-day precision were less than 100.The method was simple, rapid, accurate and sensitive for the determination of Ivermectin residues in sheep tissues by HPLC tandem mass spectrometry (HPLC / MS). Combined with the method of judging the measured concentration and using WT1.4 software, the discontinuation period of neck muscle, liver, kidney, fat and fat were 14.71 days, 18.27 days, 17.49 days and 18.61 days, respectively. The discontinuation period of the dorsal longus muscle was calculated to be 12.90 days. According to the study data of the elimination rule in the sheep of target animal and the results of the discontinuation period of ivermectin in sheep tissues, it is suggested that the drug withdrawal period of Ivermectin microemulsion injection in sheep body should be 19 days. This study laid a foundation for the new drug evaluation and clinical application of ivermectin microemulsion.
【學(xué)位授予單位】:中國農(nóng)業(yè)科學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:S859.79
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