目的:建立应用液相色谱-质谱联用(LC-MS/MS)测定大鼠血浆(包括富含血小板血浆)中5-羟色胺浓度的方法,并将其应用于感染后肠易激综合征模型大鼠体内5-HT的测定。方法:血浆样品在加入甲巯咪唑(内标)后用苯甲酰氯作为衍生试剂,以四硼酸钠...目的:建立应用液相色谱-质谱联用(LC-MS/MS)测定大鼠血浆(包括富含血小板血浆)中5-羟色胺浓度的方法,并将其应用于感染后肠易激综合征模型大鼠体内5-HT的测定。方法:血浆样品在加入甲巯咪唑(内标)后用苯甲酰氯作为衍生试剂,以四硼酸钠为催化试剂,室温下进行柱前衍生。样品在甲醇沉淀蛋白后采用ESI电离源在正离子模式下检测,用Agilent Zorbax eclipse plus C18色谱柱,甲醇-水溶液为流动相洗脱,流速为1.0ml·min-1。结果:经衍生后5-HT在大鼠富含血小板血浆及血浆中其线性范围及定量限均符合测定要求,日内、日间精密度及基质效应均<15%;肠易激综合征大鼠血浆中游离5-HT相较正常组大鼠显著增高。结论:本方法快速、灵敏、专属性强且重现性好,可用于大鼠血浆中5-HT浓度的测定。展开更多
A novel solid-phase extraction(SPE)strategy based on polypyrrole(Ppy)nanofibers was developed for the determination of trace methotrexate and its polyglutamate metabolites(MTXs)in hospital effluents.Ppy was coated on ...A novel solid-phase extraction(SPE)strategy based on polypyrrole(Ppy)nanofibers was developed for the determination of trace methotrexate and its polyglutamate metabolites(MTXs)in hospital effluents.Ppy was coated on the surface of electrospun polystyrene nanofibers by in situ oxidative polymerization to form Ppy electrospun nanofibers.The mechanism of adsorption on MTXs was explored through static adsorption studies.The MTX contents,after extraction,were determined by liquid chromatography-tandem mass spectrometry analysis.Results show that the physical/chemical adsorption of targets occurs on the surface of Ppy nanofibers,which is most likely dominated by multiple adsorptions and heterogeneous adsorption sites.Ppy nanofibers exhibit satisfying extraction performance.The content of targets detected in medical wastewater samples ranges from 21 to 2908 ng/L.The novel strategy based on Ppy nanofiber SPE can extract trace MTXs effectively,guarantee analytical accuracy,and circumvent the storage and transportation of water samples during on-site sampling operations.展开更多
目的研究健康受试者口服0.125mg和0.25mg普拉克索片的药动学过程,并评价该制剂的安全性,为注册治疗不宁腿综合征(restless leg syndrome,RLS)提供药动学依据。方法采用随机、开放、双向交叉试验设计,12名健康受试者(男女各半)分两个阶...目的研究健康受试者口服0.125mg和0.25mg普拉克索片的药动学过程,并评价该制剂的安全性,为注册治疗不宁腿综合征(restless leg syndrome,RLS)提供药动学依据。方法采用随机、开放、双向交叉试验设计,12名健康受试者(男女各半)分两个阶段分别进行单次口服普拉克索片0.125mg和0.25mg的药动学试验,两次给药间隔13天,每次给药前及给药后采集血样,采用液相色谱-串联质谱联用法(LC-MS/MS)测定健康受试者给药后血浆中普拉克索的浓度。采用WinNonlin(R)6.0版软件计算普拉克索片的药动学参数(AUC0-t、AUC0-∞﹑ρmax﹑tmax﹑t1/2﹑CL/F等)。整个试验过程进行全面安全性评估。结果单次口服普拉克索片0.125mg和0.25mg后,ρmax分别为(237±83)μg/L和(493±155)μg/L,tmax分别为(1.71±1.64)h和(1.21±1.01)h,t1/2分别为(6.12±2.21)h和(7.27±2.17)h,AUC0-∞分别为(1 791±765)μg·h·L-1和(4 419±1 932)μg·h·L-1,不同性别的药动学参数差异无统计学意义(P>0.05).试验过程无严重不良事件发生。结论单次口服0.125mg或0.25mg普拉克索吸收很快,吸收程度随剂量增加而增加,药动学过程不受性别影响.本研究制剂安全性较好,可按试验剂量给药治疗RLS。展开更多
文摘目的:建立应用液相色谱-质谱联用(LC-MS/MS)测定大鼠血浆(包括富含血小板血浆)中5-羟色胺浓度的方法,并将其应用于感染后肠易激综合征模型大鼠体内5-HT的测定。方法:血浆样品在加入甲巯咪唑(内标)后用苯甲酰氯作为衍生试剂,以四硼酸钠为催化试剂,室温下进行柱前衍生。样品在甲醇沉淀蛋白后采用ESI电离源在正离子模式下检测,用Agilent Zorbax eclipse plus C18色谱柱,甲醇-水溶液为流动相洗脱,流速为1.0ml·min-1。结果:经衍生后5-HT在大鼠富含血小板血浆及血浆中其线性范围及定量限均符合测定要求,日内、日间精密度及基质效应均<15%;肠易激综合征大鼠血浆中游离5-HT相较正常组大鼠显著增高。结论:本方法快速、灵敏、专属性强且重现性好,可用于大鼠血浆中5-HT浓度的测定。
基金The National Natural Science Foundation of China(No.82173575)。
文摘A novel solid-phase extraction(SPE)strategy based on polypyrrole(Ppy)nanofibers was developed for the determination of trace methotrexate and its polyglutamate metabolites(MTXs)in hospital effluents.Ppy was coated on the surface of electrospun polystyrene nanofibers by in situ oxidative polymerization to form Ppy electrospun nanofibers.The mechanism of adsorption on MTXs was explored through static adsorption studies.The MTX contents,after extraction,were determined by liquid chromatography-tandem mass spectrometry analysis.Results show that the physical/chemical adsorption of targets occurs on the surface of Ppy nanofibers,which is most likely dominated by multiple adsorptions and heterogeneous adsorption sites.Ppy nanofibers exhibit satisfying extraction performance.The content of targets detected in medical wastewater samples ranges from 21 to 2908 ng/L.The novel strategy based on Ppy nanofiber SPE can extract trace MTXs effectively,guarantee analytical accuracy,and circumvent the storage and transportation of water samples during on-site sampling operations.
