Microdialysis is a technique used to measure the unbound antibiotic concentration in the interstitial spaces, the target site of action. In vitro recovery studies are essential to calibrating the microdialysis system ...Microdialysis is a technique used to measure the unbound antibiotic concentration in the interstitial spaces, the target site of action. In vitro recovery studies are essential to calibrating the microdialysis system for in vivo studies. The effect of a combination of antibiotics on recovery into microdialysate requires investigation. In vitro microdialysis recovery studies were conducted on a combination of vancomycin and tobramycin, in a simulated in vivo model. Comparison was made between recoveries for three different concentrations and three different perfusate flow rates. The overall relative recovery for vancomycin was lower than that of tobramycin. For tobramycin, a concentration of 20μg/mL and flow rate of 1.0μL/min had the best recovery. A concentration of 5.0μg/mL and flow rate of 1.0μL/min yielded maximal recovery for vancomycin. Large molecular size and higher protein binding resulted in lower relative recoveries for vancomycin. Perfusate flow rates and drug concentrations affected the relative recovery when a combination of vancomycin and tobramycin was tested. Low perfusate flow rates were associated with higher recovery rates. For combination antibiotic measurement which includes agents that are highly protein bound, in vitro studies performed prior to in vivo studies may ensure the reliable measurement of unbound concentrations.展开更多
目的研究疫苗中硫柳汞含量对劳里测定(Lowry Assay,Lowry)法测定蛋白质含量结果的影响,为准确测定新型甲型H1N1流行性感冒(甲流)疫苗蛋白质含量提供依据。方法配制终浓度分别为30μg/ml(微克/毫升)与60μg/ml的甲流病毒抗原、人血清白...目的研究疫苗中硫柳汞含量对劳里测定(Lowry Assay,Lowry)法测定蛋白质含量结果的影响,为准确测定新型甲型H1N1流行性感冒(甲流)疫苗蛋白质含量提供依据。方法配制终浓度分别为30μg/ml(微克/毫升)与60μg/ml的甲流病毒抗原、人血清白蛋白及重组乙型肝炎病毒表面抗原溶液(均含有终浓度分别为10、20、40、60、80、100μg/ml的硫柳汞),于不同时间点使用Lowry法(《中国药典》2010年版三部)测定各溶液的蛋白质含量,将结果进行比较。结果以Lowry法测定蛋白质含量,30μg蛋白/ml组回收率在125.85%～284.14%,硫柳汞含量与回收率呈正相关,相关系数(Coefficient of Correlation,r)为0.992～0.997;去除硫柳汞影响后,回收率99.25%～104.92%。60μg蛋白/ml组回收率112.12%～191.60%,硫柳汞含量与回收率呈正相关,r值为0.993～0.997;去除硫柳汞影响后,回收率97.35%～103.79%。结论硫柳汞可使Lowry法测定的蛋白质含量结果偏高,且硫柳汞含量与蛋白质含量偏高程度呈高度正相关,通过定量测定去除其影响后,可以准确测出甲流疫苗中的蛋白质含量,为甲流疫苗质量评价提供依据。展开更多
基金funded by the TPCH foundation grant (MS201140)the RBWH foundation grant 2012+1 种基金funding from the Australian National Health and Medical Research Council for a Centre of Research Excellence (APP1099452)funded in part by a Practitioner Fellowship (APP1117065) from the National Health and Medical Research Council of Australia
文摘Microdialysis is a technique used to measure the unbound antibiotic concentration in the interstitial spaces, the target site of action. In vitro recovery studies are essential to calibrating the microdialysis system for in vivo studies. The effect of a combination of antibiotics on recovery into microdialysate requires investigation. In vitro microdialysis recovery studies were conducted on a combination of vancomycin and tobramycin, in a simulated in vivo model. Comparison was made between recoveries for three different concentrations and three different perfusate flow rates. The overall relative recovery for vancomycin was lower than that of tobramycin. For tobramycin, a concentration of 20μg/mL and flow rate of 1.0μL/min had the best recovery. A concentration of 5.0μg/mL and flow rate of 1.0μL/min yielded maximal recovery for vancomycin. Large molecular size and higher protein binding resulted in lower relative recoveries for vancomycin. Perfusate flow rates and drug concentrations affected the relative recovery when a combination of vancomycin and tobramycin was tested. Low perfusate flow rates were associated with higher recovery rates. For combination antibiotic measurement which includes agents that are highly protein bound, in vitro studies performed prior to in vivo studies may ensure the reliable measurement of unbound concentrations.
文摘目的研究疫苗中硫柳汞含量对劳里测定(Lowry Assay,Lowry)法测定蛋白质含量结果的影响,为准确测定新型甲型H1N1流行性感冒(甲流)疫苗蛋白质含量提供依据。方法配制终浓度分别为30μg/ml(微克/毫升)与60μg/ml的甲流病毒抗原、人血清白蛋白及重组乙型肝炎病毒表面抗原溶液(均含有终浓度分别为10、20、40、60、80、100μg/ml的硫柳汞),于不同时间点使用Lowry法(《中国药典》2010年版三部)测定各溶液的蛋白质含量,将结果进行比较。结果以Lowry法测定蛋白质含量,30μg蛋白/ml组回收率在125.85%～284.14%,硫柳汞含量与回收率呈正相关,相关系数(Coefficient of Correlation,r)为0.992～0.997;去除硫柳汞影响后,回收率99.25%～104.92%。60μg蛋白/ml组回收率112.12%～191.60%,硫柳汞含量与回收率呈正相关,r值为0.993～0.997;去除硫柳汞影响后,回收率97.35%～103.79%。结论硫柳汞可使Lowry法测定的蛋白质含量结果偏高,且硫柳汞含量与蛋白质含量偏高程度呈高度正相关,通过定量测定去除其影响后,可以准确测出甲流疫苗中的蛋白质含量,为甲流疫苗质量评价提供依据。
