国产与进口替米沙坦片的人体生物等效性

目的 :评价国产和进口替米沙坦片剂的生物等效性。方法 :采用随机交叉试验 ,HPLC荧光法测定 2 0名中国健康男性受试者口服替米沙坦的血药浓度。药动学参数用 3P97程序进行计算。结果 :国产与进口替米沙坦片的主要药动学参数 :AUC0→t分别为 (2 381 2 0± 10 98 5 1)、(2 333 36± 114 5 75 ) μg·h·L-1;AUC0→∞ 为 (2 4 86 4 4± 1135 70 )、(2 4 4 0 35± 1190 37) μg·h·L-1;cmax为 (5 71 99± 36 8 2 7)、(5 30 97± 2 5 6 38) μg·L-1;tmax为 (1 15± 0 6 8)、(1 2 0± 1 6 0 )h ;T1/ 2 为 (19 0 8± 2 91)、(18 99±2 92 )h。国产替米沙坦片的相对生物利用度是 (10 4 2 9± 2 1 17) % (n =2 0 )。国产和进口替米沙坦片主要药动学参数经统计学(ANOVA)处理均无显著性差异 (P >0 0 5 ) ;AUC0→t、cmax经对数转换后的双单侧t检验示无显著性差异。结论 :国产和进口替米沙坦片具有生物等效性     

替米沙坦3种制剂的人体生物等效性研究

目的:比较国产替米沙坦片及胶囊与进口替米沙坦片的相对生物利用度。方法:24名健康男性受试者采用3种制剂3周期随机交叉试验设计。反相高效液相色谱法测定单剂量口服80mg国产替米沙坦片、替米沙坦胶囊、进口替米沙坦片后的替米沙坦血药浓度。3P87程序计算药动学参数,AUC,cmax对数转换后进行方差分析并计算90%可信区间。结果:国产替米沙坦片、替米沙坦胶囊、进口替米沙坦片的主要药动学参数分别为:cmax(703±s209),(703±196),(707±202)μg·L-1;tmax(0.88±0.15),(0.91±0.18),(0.85±0.13)h;AUC0～84(17863±7223),(17995±7207),(17950±7616)μg·h·L-1;AUC0～∞(20587±7309),(20732±7129),(20960±7420)μg·h·L-1;MRT(35±5),(35±5),(36±6)h;t1/2:(25±4),(25±4),(26±5)h。结论:国产替米沙坦片、替米沙坦胶囊、进口替米沙坦片具有生物等效性。     

尼莫地平片的药动学及生物等效性

目的 :研究尼莫地平片的药动学和相对生物利用度 ,验证该制剂与进口尼莫地平片的生物等效性。方法 :采用HPLC法测定 2 4名健康男性志愿者自身交叉单剂量口服国产尼莫地平片和进口尼莫地平片 12 0mg的经时血药浓度 ,计算主要药动学参数以及受试制剂的生物利用度。结果 :国产尼莫地平片和进口尼莫地平片的血药浓度 时间曲线符合一室模型 ,其主要药动学参数 :Cmax分别为 (83.9± 15 .4) μg·L-1与 (83.5± 12 .8) μg·L-1,Tmax分别为 (0 .5 7± 0 .0 6 )h与 (0 .6 7± 0 .0 8)h ,T1/2ke分别为 (1.80± 0 .16 )h与 (1.6 9± 0 .17)h ,AUC0 -t分别为 (16 0 .9± 15 .8) μg·h·L-1与 (15 6 .2± 18.7) μg·h·L-1。国产尼莫地平片对进口尼莫地平片的相对生物利用度为 (10 8.0± 7.2 ) %。结论 :国产尼莫地平片与进口尼莫地平片生物等效     

国产与进口替扎尼定片人体药动学和相对生物利用度比较

目的 :比较国产与进口替扎尼定片在正常人体内的药动学与相对生物利用度。方法 :18名男性志愿者随机交叉单次口服国产或进口替扎尼定片4mg后 ,采用高效液相色谱 (HPLC)法测定血药浓度 ,用 3p97软件包计算两者的药动学参数与相对生物利用度。结果 :国产片和进口片口服吸收的药 时曲线符合一房室模型。Tmax分别为 (1.3±s 0 .5 )h和 (1.2± 0 .4 )h ;Cmax 分别为 (10± 7) μg·L- 1和(10± 6 ) μg·L- 1;AUC0 10 分别为 (16± 11) μg·h·L- 1和 (17± 12 ) μg·h·L- 1;T12 β分别为 (1.1± 0 .6 )h和 (0 .9± 0 .4 )h。国产片相对于进口片的生物利用度为 (94± 14 ) % ,经配对t检验、方差分析、双单侧t检验及 (1 2α)置信区间法统计分析 ,各药动学参数无显著差异 (P >0 .0 5 )。结论 :国产片与进口片生物等效。     

HPLC/MS研究国产盐酸班布特罗片及其代谢物特布他林人体生物等效性

目的　研究国产班布特罗片剂和进口片剂进行人体生物等效性研究。方法　 2 0名健康受试者随机交叉给药 ,用液相色谱 /质谱联用测定血浆中班布特罗其代谢物特布他林的浓度。结果　经数据处理 ,单次口服国产和进口班布特罗片剂后班布特罗的药代动力学参数 :AUC0 -t分别为 (5 2± 2 1) μg·h·L-1和 (5 1± 2 0 ) μg·h·L-1,Tmax分别为 (2 9± 0 9)h和 (2 6± 0 7)h ,Cmax分别为 (6 0± 2 6 ) μg·L-1和 (6 2± 2 9) μg·L-1。特布他林 :AUC0 -t分别为 (191± 30 ) μg·h·L-1和 (197± 37) μg·h·L-1,Tmax分别为 (4 2± 1 0 )h和 (4 2± 1 0 )h ,Cmax分别为 (10± 5 )μg·L-1和 (10± 4) μg·L-1。国产班布特罗片剂单次给药后的相对生物利用度为 10 2 %± 8% (班布特罗 ) ,10 0 %±12 % (特布他林 )。结论　经统计学证明两制剂有生物等效性     

国产和进口单硝酸异山梨酯缓释胶囊单次和多次给药的人体药动学(英文)

目的 :比较国产和进口单硝酸异山梨酯缓释胶囊的人体药动学和相对生物利用度。方法 :采用单次和多次给药的 4周期双交叉设计 ,气相色谱 电子捕获检测法 (GC ECD)测定 2 2名健康男性志愿者血浆中单硝酸异山梨酯的浓度。结果 :单次 (2 5mg)口服国产和进口单硝酸异山梨酯缓释胶囊后的药动学参数分别为 :Tmax为 (5 .7±s 0 .5 )h和 (5 .8±1 .0 )h ,Cmax为 (2 3 6± 62 ) μg·L-1和 (2 42± 62 )μg·L-1,T1/ 2 为 (8.3± 1 .6)h和 (8.4± 2 .1 )h ,AUC0 3 6为 (3 .7± 0 .9)mg·h·L-1和 (3 .6±0 .9)mg·h·L-1,AUC0 ∞ 为 (4 .0± 0 .9)mg·h·L-1和 (3 .8± 0 .8)mg·h·L-1,平均滞留时间MRT为 (1 1 .5±0 .8)h和 (1 1 .4± 0 .7)h。多次 (2 5mg,6d)口服国产和进口单硝酸异山梨酯缓释胶囊后的稳态药动学参数分别为 :Tmax 为 (5 .2± 0 .7)h和 (5 .4±0 .9)h,Cmax为(3 1 4± 67) μg·L-1和 (3 1 0± 5 8) μg·L-1,Cmin为(63± 1 4) μg·L-1和 (65± 1 6) μg·L-1,稳态血药浓度均值Cav为 (1 87± 3 8) μg·L-1和 (1 83± 3 8) μg·L-1,AUC0 3 6h为 (5 .0± 1 .0 )mg·h·L-1和 (4 .9± 1 .0 )mg·h·L-1,波动度DF为 (1 3 4± 2 0 )%和 (1 3 4± 1 8) %。单次和多次口服国产与进口单硝酸异山梨酯     

三种替米沙坦制剂在中国健康人体的药动学及生物等效性

目的:评价健康受试者单剂量口服受试替米沙坦胶囊,片剂以及参比替米沙坦片剂的人体药动学与生物等效性。方法:采用3种制剂3周期随机交叉试验设计,LC-MS-MS法测定18例男性健康受试者单剂量口服80 mg国产替米沙坦胶囊、替米沙坦片和进口替米沙坦片后替米沙坦的血药浓度。采用非室模型计算药动学参数。AUC,Cmax对数转换后进行方差分析并计算90％置信区间。结果:国产替米沙坦胶囊、替米沙坦片剂,进口替米沙坦片剂的主要药动学参数分别为:Cmax=(1 016．3±571．7),(869．7±623．8)和(905．7±583．4)ng·mL-1, Tmax=(1．5±1．0),(1．5±0．6)和(1．6±1．1)h,AUC0-t=(7 372±3 955),(7 373±4 347)和(6 774±3 758)ng·h·mL-1,AUC0-∞=(8 432±4 946),(8 623±5 687)和(7 502±4 663)ng·h·mL-1,t1/2=(24．9±9．2),(24．5±11．9)和(23．0±6．5)h。结论:国产替米沙坦胶囊、替米沙坦片与进口替米沙坦片具有生物等效性。     

两种硝酸异山梨醇酯缓释胶囊的人体药动学比较

目的 :选择 12名男性健康志愿者 ,进行单剂量口服硝酸异山梨醇酯缓释胶囊的人体药动学研究。方法 :采用毛细管气相色谱法 ,测定单剂量口服 4 0mg国产与进口硝酸异山梨醇酯缓释胶囊在健康人体内的硝酸异山梨醇酯浓度。结果 :硝酸异山梨醇酯缓释胶囊的体内动态过程呈一级吸收的二房室开放模型 ,国产与进口缓释胶囊的Cmax分别为 (2 3.6± 6 .2 ) μg·L-1和 (2 3.7± 5 .1) μg·L-1,tmax分别为 (3.3± 0 .6 )h和 (3.8± 0 .6 )h ,MRT分别为 (9.1± 0 .8)h和 (9.1± 0 .7)h ,t1/ 2 分别为 (8.2± 1.0 )h和 (8.1± 0 .9)h ,AUC0～ 2 4分别为 (12 6 .3± 15 .4 ) μg·h·L-1和 (12 4 .0± 14 .1) μg·h·L-1,AUC0→∞ 分别为 (139.4±14 .8) μg·h·L-1和 (136 .7± 13.8) μg·h·L-1。结论 :国产与进口硝酸异山梨醇酯缓释胶囊具有相似的人体药动学特征     

多剂量口服盐酸氨溴索缓释胶囊的人体药代动力学及相对生物利用度

目的　研究多剂量口服盐酸氨溴索缓释胶囊的人体药代动力学和相对生物利用度。方法　选择盐酸奎宁为定量内标物 ,采用反相高效液相色谱法测定了多剂量口服 75mg盐酸氨溴索国产缓释胶囊和进口缓释胶囊在健康人体内的盐酸氨溴索血药浓度 ,以考察盐酸氨溴索缓释胶囊多剂量口服达稳态过程和稳态药代动力学特征。结果　 75mg盐酸氨溴索缓释胶囊连续口服d 4起 ,体内盐酸氨溴索血药浓度基本达稳态水平。国产缓释胶囊和进口缓释胶囊的稳态药代动力学参数Tmax分别为 (4 2± 0 7)h和 (4 1± 0 8)h ,Cmax分别为 (2 0 8 73± 31 91) μg·L-1和 (2 12 5 6± 2 9 6 4) μg·L-1,Cmin分别为 30 76± 10 47μg·L-1和 (2 9 80± 10 2 3)μg·L-1,AUCss分别为 (2 113 90± 430 6 0 ) μg·h·L-1和2 0 88 2 2± 40 2 5 2 μg·h·L-1,Cav分别为 (88 0 8± 17 94) μg·L-1和 (87 0 1± 16 77) μg·L-1,DF分别为 (2 0 7± 0 31)和(2 16± 0 37) ,多剂量口服 75mg国产盐酸氨溴索缓释胶囊的相对生物利用度为 10 1 10 %± 6 33 %。结论　盐酸氨溴索国产缓释胶囊和进口缓释胶囊的主要稳态药代动力学参数差异均无显著性 ,两种制剂具有生物等效性     

国产盐酸尼卡地平缓释胶囊人体药代动力学及生物利用度

目的　比较国产和进口盐酸尼卡地平 (Nic)缓释胶囊的药代动力学及生物利用度。方法　选择 12名健康志愿者随机交叉单剂量及多剂量口服两种Nic缓释胶囊 ,采用GC ECD检测 ,内标法定量测定其血药浓度。结果　两种缓释胶囊空腹给药 ,其单剂量及多剂量达稳态后经时血药浓度均呈双峰曲线 ,国产胶囊单剂量给药的主要参数 :Cmax1( 14 2± 8 2 ) μg·L-1,Cmax2 ( 16 9± 5 8) μg·L-1,Tmax1( 0 79±0 45 )h ,Tmax2 ( 5 0 8± 0 79)h ,T1/2Ke( 5 49± 2 5 3)h ,AUC0～ 2 4 ( 97 9± 2 4 8) μg·h·L-1。多剂量给药的主要参数 :Cmax( 36 7± 6 1) μg·L-1,Cmin( 7 3± 1 6 ) μg·L-1,Cav( 18 9± 3 2 ) μg·L-1,FI( 1 5 6± 0 2 6 ) ,AUC0～ 36( 341 4±48 5 ) μg·h·L-1。国产Nic缓释胶囊单剂量及多剂量给药与进口制剂比较的相对生物利用度各为 97 5 %± 19 3 %和98 2 %± 16 5 %。结论　方差分析及双单侧t检验表明 ,两种制剂具有生物等效性     

Efficacy of gut lavage,hemodialysis, and hemoperfusion in the therapy of paraquat or diquat intoxication

Clinical and in vitro investigations were carried out to test the efficacy of gut lavage, hemodialysis, and hemoperfusion in the treatment of poisoning with paraquat or diquat. In a patient suffering from diquat intoxication 130 times more diquat was removed by gut lavage 30 h after ingestion than was removed by complete aspiration of the gastric contents.Determination of in vitro clearances for paraquat and diquat by hemodialysis showed that, at serum concentrations of 1–2 ppm, such as are frequently encountered in poisoning in man, toxicologically relevant quantities of herbicide cannot be removed from the body. At a concentration of 20 ppm, on the other hand, hemodialysis proved to be effective, the clearance being 70 ml/min at a blood flow rate of 100 ml/min. The efficacy of hemoperfusion with coated activated charcoal was on the whole better. Especially at concentrations around 1–2 ppm, the clearance values for hemoperfusion were some 5–7 times higher than those for hemodialysis.In a patient suffering from paraquat poisoning, both hemodialysis as well as hemoperfusion were carried out. The in vitro results could be confirmed: At serum concentrations of paraquat less than 1 ppm no clearance could be obtained by hemodialysis while by hemoperfusion with activated charcoal quite high clearance values were measured and the serum level dropped down to zero.

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Zusammenfassung Klinische Untersuchungen und Laboratoriumsversuche wurden durchgeführt, um die Wirksamkeit von Darmspülung, Hämodialyse und Hämoperfusion bei Paraquat- und Deiquat-Vergiftungen zu prüfen.Bei einem Patienten wurde 30 Std nach Deiquat-Aufnahme durch Darmspülung 130mal mehr Deiquat entfernt als durch vollständige Aspiration des Mageninhaltes. In vitro-Versuche ergaben, daß bei Blutserumkonzentrationen von 1–2 ppm, die bei Vergiftungen oft gemessen werden, durch Hämodialyse keine toxikologisch relevanten Paraquat- oder Deiquat-Mengen entfernt werden können. Dagegen erwies sich die Hämodialyse bei 20 ppm und einer Blutumlaufgeschwindigkeit von 100 ml/min mit einer Clearance von 70 ml/min als wirksam. Die Hämoperfusion mit beschicheter Aktivkohle war in diesen Versuchen aber eindeutig überlegen, denn insbesondere bei Konzentrationen um 1–2 ppm waren die Clearance-Werte 5–7mal höher als bei der Hämodialyse.Die in vitro-Ergebnisse wurden bei einem Patienten mit einer Paraquat-Vergiftung bestätigt: Bei Konzentrationen unter 1 ppm war die Hämodialyse wirkungslos, während durch Hämoperfusion relativ hohe Clearance-Werte erreicht wurden, so daß der Serumspiegel rasch unter die Nachweisgrenze abfiel.

     

In vitro studies on sterically stabilized liposomes (SL) as enzyme carriers in organophosphorus (OP) antagonism

This study describes a new approach for organophosphorous (OP) antidotal treatment by encapsulating an OP hydrolyzing enzyme, OPA anhydrolase (OPAA), within sterically stabilized liposomes. The recombinant OPAA enzyme was derived from Alteromonas strain JD6. It has broad substrate specificity to a wide range of OP compounds: DFP and the nerve agents, soman and sarin. Liposomes encapsulating OPAA (SL)* were made by mechanical dispersion method. Hydrolysis of DFP by (SL)* was measured by following an increase of fluoride ion concentration using a fluoride ion selective electrode. OPAA entrapped in the carrier liposomes rapidly hydrolyze DFP, with the rate of DFP hydrolysis directly proportional to the amount of (SL)* added to the solution. Liposomal carriers containing no enzyme did not hydrolyze DFP. The reaction was linear and the rate of hydrolysis was first order in the substrate. This enzyme carrier system serves as a biodegradable protective environment for the recombinant OP-metabolizing enzyme, OPAA, resulting in prolongation of enzymatic concentration in the body. These studies suggest that the protection of OP intoxication can be strikingly enhanced by adding OPAA encapsulated within (SL)* to pralidoxime and atropine.     

Aquatic Insects and Trace Metals: Bioavailability,Bioaccumulation, and Toxicity

Abstract

The uptake of metals from food and water sources by insects is thought to be additive. For a given metal, the proportions taken up from water and food will depend both on the bioavailable concentration of the metal associated with each source and the mechanism and rate by which the metal enters the insect. Attempts to correlate insect trace metal concentrations with the trophic level of insects should be made with a knowledge of the feeding relationships of the individual taxa concerned. Pathways for the uptake of essential metals, such as copper and zinc, exist at the cellular level, and other nonessential metals, such as cadmium, also appear to enter via these routes. Within cells, trace metals can be bound to proteins or stored in granules. The internal distribution of metals among body tissues is very heterogeneous, and distribution patterns tend to be both metal and taxon specific. Trace metals associated with insects can be both bound on the surface of their chitinous exoskeleton and incorporated into body tissues. The quantities of trace meals accumulated by an individual reflect the net balance between the rate of metal influx from both dissolved and particulate sources and the rate of metal efflux from the organism. The toxicity of metals has been demonstrated at all levels of biological organization: cell, tissue, individual, population, and community. Much of the literature pertaining to the toxic effects of metals on aquatic insects is based on laboratory observations and, as such, it is difficult to extrapolate the data to insects in nature. The few experimental studies in nature suggest that trace metal contaminants can affect both the distribution and the abundance of aquatic insects. Insects have a largely unexploited potential as biomonitors of metal contamination in nature. A better understanding of the physico-chemical and biological mechanisms mediating trace metal bioavailability and exchange will facilitate the development of general predictive models relating trace metal concentrations in insects to those in their environment. Such models will facilitate the use of insects as contaminant biomonitors.     

Steroidal sapogenin contents in some domestic plants

In order to find out the values of the steroid resources for the future use. the compositions and contents of steroidal sapogenins from 13 domestic plants have been investigated. As a result,Dioscorea nipponica, D. quinqueloba andSmilax china were found to have large amount of diosgenin. And pennogenin inTrillium kamtschaticum andParis verticillata, yuccagenin inAllium fistulosum, hecogenin inAgave americana and neochlorogenin inSolanum nigum were appeared to be major steroidal sapogenins.     

Alzheimer’s disease – current trends in basic and clinical research. Highlights from the 16th ECNP

Advances in the molecular biological knowledge of neuronal nicotinic acetylcholine receptors (nAChRs) have led to a growing interest by the pharmaceutical industry in the development of novel compounds that selectively modulate nAChR function. The ability of (-)-nicotine, an activator of nAChRs, to enhance attentional aspects of cognition in animals and humans, to exert neuroprotective and anxiolytic-like effects, and presumably to mediate the negative correlation between smoking and Alzheimer's (and Parkinson's) Disease, has focused interest on the potential therapeutic utility of modulators of nAChR function for treatment of some of the deficits associated with these progressive, neurodegenerative conditions. Numerous compounds are known which activate nAChRs and which might serve as lead compounds toward the development of such agents. The pharmacologic diversity of neuronal nAChR subtypes suggests the possibility of developing selective compounds which would have more favourable side-effect profiles than existing agents. This broader class of agents, collectively called cholinergic channel modulators (ChCMs), is anticipated to encompass compounds which would have more favourable side-effect profiles than existing agents, which generally exhibit low selectivity. This selectivity may be achieved by preferentially activating some subtypes of nAChRs (i.e., Cholinergic Channel Activators, ChCAs) or inhibiting the function of other subtypes (Cholinergic Channel Inhibitors, ChCIs). An overview of the biology of nAChRs and the rationale for the use of ChCMs for the treatment of dementia related to neurodegenerative diseases are presented, followed by a discussion of lead compounds and compounds under consideration for clinical evaluation.