共查询到17条相似文献,搜索用时 62 毫秒
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目的 研究酮洛芬异丙酯在离体裸小鼠和猴皮肤中的渗透和代谢 ,阐明皮肤酯酶代谢的主要活性部位。方法 采用外科手术和酶消化方法制备离体皮肤 ,用水平双室扩散池进行体外渗透实验 ,HPLC方法测定样品中的药物浓度。结果 经全皮和去角质层皮肤渗透的酮洛芬异丙酯被代谢成酮洛芬 ,接受室中酮洛芬的浓度随时间延长而成线性增加。在裸小鼠皮肤中 ,酮洛芬全皮渗透的稳态速率是酮洛芬异丙酯全皮渗透的 2 5倍 ,而渗透实验结束后酮洛芬异丙酯及代谢物酮洛芬在皮肤中残留量是酮洛芬渗透实验结束后残留量的 2 2 2倍 ;酮洛芬异丙酯经真皮渗透时 ,代谢物酮洛芬的稳态形成速率大大小于经全皮渗透时的稳态形成速率。在猴皮肤中 ,酮洛芬异丙酯经全皮渗透时代谢物酮洛芬的稳态形成速率是经去角质层皮肤的 0 7倍 ,而渗透实验结束后皮肤中酮洛芬和酮洛芬异丙酯的残留量是去角质层皮肤的 2 0倍 ;酮洛芬异丙酯经真皮渗透时 ,代谢物酮洛芬的稳态形成速率小于经全皮和去角质层皮肤渗透时的稳态形成速率 ,渗透结束后皮肤中酮洛芬的残留量也小。结论 酮洛芬酯前体药物在皮肤原位能被代谢成活性母体酮洛芬本身 ,且在皮肤中能长时间驻留 ,有助于提高和延长酮洛芬的局部疗效。表皮层是皮肤酯酶代谢的主要活性部位 相似文献
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酮洛芬异丙酯在皮肤细胞中的代谢 总被引:11,自引:0,他引:11
目的:研究酮洛芬异丙酯在皮肤细胞中的代谢作用,为进一步研究利用酯类前体药物方法改善药物的经皮吸收特性提供实验依据。方法:将人包皮的第3代角质形成细胞或成纤维细胞超声破碎制成匀浆,加入不同量的酮洛芬异丙酯进行37℃温孵实验,通过高效液以谱法分别在不同时间测定细胞匀浆中酮洛芬异丙酯及酮洛芬的浓度。结果:酮洛芬异丙酯在表皮角质形成细胞和真皮成纤维细胞的匀浆中存在代谢现象,有前者的代谢能力明显大于后者。结论:酯类前体药物可在皮肤细胞中被代谢为活性母体药物本身。 相似文献
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对药物皮肤渗透实验,常采用离体动物皮肤做模型进行研究和预测人体皮肤对某些药物的渗透性大小及差别,但离体动物皮肤与人体皮肤差异较大,对药物的渗透性很难反映药物经人体皮肤的渗透情况,体外评价药物的经皮渗透以人离体皮肤最合适,但人离体皮肤来源有限,且它们的变异性很 相似文献
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经皮给药系统(TDDS)可避免首关效应、胃肠道破坏,为新型皮肤给药系统,可通过控制释放而延长治疗效果,成为药物制剂开发研究的热点之一。但是,药物的理化性质以及皮肤屏障影响药物的经皮吸收。综述了TDDS常用的促渗透技术,包括化学、物理、纳米、天然促渗透技术;介绍了促渗透能力的测定方法,包括体外、离体和体内评估皮肤渗透性的方法。通过对经皮药物递送系统和经皮吸收能力测定方法的归纳与总结,以期为TDDS的合理使用和快速发展提供参考。 相似文献
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一过性离体大鼠肝脏灌流模型的建立 总被引:1,自引:0,他引:1
目的利用UP-100通用灌流仪建立了一过性离体大鼠肝脏灌流模型。方法用Krebs-Henseleit碳酸氢盐缓冲液进行一过性离体大鼠肝脏灌流,在灌流时长90 min内通过检测AST、ALT和LDH的浓度,观察肝脏外观及胆汁流量,测定肝重变化,进行组织切片观察组织病理变化来评估离体灌流肝脏的损伤程度。结果 90 min灌流时长中,肝脏颜色质地正常,胆汁流量均匀,相应转氨酶释放量少,病理切片结果正常。结论离体大鼠肝脏在UP-100通用灌流仪90 min灌流过程中能保持较好的组织结构和肝脏功能,可用于离体肝脏的药物代谢研究。 相似文献
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目的研究表皮生长因子的经皮渗透性,并考察透皮吸收促进剂月桂氮酮(Azone)对其经皮渗透性的影响。方法以广西小型猪为实验模型动物,应用经皮微渗析在体取样技术进行实验。探针的在体回收率以反向渗析法测定。结果Azone可以极人地提高药物在渗析液及皮肤中的浓度,2%和5%的Azone分别使渗析液中药物的稳态流量从0.001μg/h提高到1.281和1.824μg/h。结论经皮微渗析技术是研究药物在体经皮吸收的有力工具。Azone是表皮生长因子经皮吸收的优良促进剂。 相似文献
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以经皮微渗析技术研究奥旦西酮的大鼠在体经皮吸收 总被引:6,自引:1,他引:6
目的:研究奥旦西酮的经皮渗透性,并考察透皮吸收促进剂月桂氮 酮(azone)对其经皮渗透性的影响。方法:以大鼠为实验模型动物,应用经皮微渗析在体取样技术进行实验。探针的在体回收率以反向渗析法测定。结果:Azone可以极大地提高药物在渗析液及皮肤中的浓度,2%和5%的azone分别使渗析液中药物的稳态流量从0.001 μg.h-1提高到1.281和1.824 μg.h-1。结论:经皮微渗析技术是研究药物在体经皮吸收的有力工具。Azone是奥旦西酮经皮吸收的优良促进剂。 相似文献
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偏二甲基肼经皮吸收在家兔体内的毒物代谢动力学 总被引:1,自引:0,他引:1
家兔偏二甲基肼(UDMH)78.2和156.0mg·kg-1pc以及78.2mg·kg-1sc,血中UDMH浓度的经时变化均符合无时滞的一级吸收一室模型。而iv39.0mg·kg-1UDMH呈二室模型.UDMHpc后能够立即透过家免皮肤被吸收入血,约经0.36-0.85h吸收相即基本结束,吸收率仅为14%左右;而UDMHsc的吸收率为99.2%。吸收速度却明显慢于pc;蒸发逸散是影响UDMH透皮吸收的主要原因.UDMH在家兔体内的消除半衰期介于0.31-1.52h之间。24h累积因子为1.表明UDMH在家兔体内消除较快,物质蓄积性弱;实验期间经尿排出的原形UDMH只占机体总消除量的2.7%-18.9%。提示存在肾外消除途径. 相似文献
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Percutaneous Absorption and Metabolism of Ketoprofen Isopropyl Ester via Excised Nude Mouse‘s and Monkey’s Skin 下载免费PDF全文
ZHUQuan-gang HUJin-hong 《中国药学》2003,12(1):49-53
Aim:To study percutaneous absorption and metabolism of ketoprofen isopropyl ester (KPE)via excised nude mouse‘s and monkey‘s skin.Methods:Excised skin was prepared by surgical excision and enzyme digestion.Sideby-side diffusion cells were used for in vitro permeation studies.The concentrations of KPE and its metabolite in samples were assayed by HPLC.Results:All KPE penetration through whole thickness skin and stripped skin was metabolized to ketoprofen(KP).the concentration of which in the reciiver solution increased linearly with time.As to the nude mouse skin.the steady-state flux of KP through whole thickness skin was 2.5 times that of KPE through the whloe thickness skin,but the KP and KPE remaining in the whole thickness skin after the finishing of KPE penetration was 22.2 times in compered with the KP remaining in the whole thickness skin after the finshing of KP penetration.The rate of formation of the steady state KP from KPE throught dermis was significantly lower than that of KPE through the whole thickness skin.In he monkey skin,the rate of formation of the steady-state KP from KPE through the whole thickness skin was 0.7 times that from KPE through stripped skin.The KP and KPE remaining in the whole thickness skin after the finishing of KPE penetration was 2.0 time that in the stripped skin after the finishing of KPE penetration.The rate of fornation of the steady-state KP from KPE through dermis was lower than that from KPE through the whole thickness skin and the stripped skin.the KP remaining in dermis after the finsihing of KPE penetration was also significantly lower than the KP remaining in the whole thickness skin and the stripped skin after the finishing of KPE penetration.Conclusion:KP esters are of benefit to imporove the local action of KP.and skin esterase metabolism mainly develops in the epidermis. 相似文献
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目的 评价皮肤角质层和真皮层对药物经皮吸收的差异。方法 选择氟尿嘧啶 (5 - FU)为模型药物 ,采用Franz扩散池法 ,考察药物经完整皮肤和剥离角质层皮肤的体外透皮能力 (Kp) ,并比较吸收促进剂肉豆蔻酸异丙酯 (IPM)共存时的促透能力大小。结果 5 - FU经剥离角质层皮肤的 Kp是经完整皮肤的 2 .2倍 ,加入IPM后 5 - FU的 Kp分别提高到原来的 1 .6倍 (经完整皮肤 )和 2 .3倍 (经剥离角质层皮肤 )。结论 本实验为皮肤病态条件 ,如皮肤受伤或溃疡等时的药物经皮吸收规律研究提供一种新的方法。 相似文献
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目的:评价皮肤角质层和活性皮肤层对药物经皮渗透的差异。方法:选择安替比林(AT)为模型药物,采用Franz扩散池法,考察药物经完整皮肤和剥离角质层皮肤的体外透皮能力Kp,并比较吸收促进剂肉豆蔻酸异丙酯(IPM)共存时的促透能力大小。结果:AT经剥离角质层皮肤的Kp是经完整皮肤的3.24倍,加入IPM后AT的Kp分别提高到原来的3.68倍(经完整皮肤)和5.17倍(经剥离角质层皮肤)。结论:本实验为皮肤病态条件,如皮肤受伤或溃疡等时的药物经皮吸收规律研究提供一种新的方法。 相似文献
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Animal models are important tools to predict human in vivo percutaneous absorption/penetration. Monkey, pig, rat, rabbit, guinea pig, hairless rodents, such as hairless rat, hairless mouse, hairless guinea pig and hairless dog, are among the most used animals for this purpose. Each animal model has its own advantages and weakness or limitation. To better correlate animal data with human skin absorption, we need to be familiar with each animal model's characteristics as well as experimental method and condition. We reviewed the original papers published after 1993 that described permeability of both animal skin and human skin. It showed that monkey, pig and hairless guinea pig are more predictive of human skin absorption/penetration and common laboratory animals, such as rat, rabbit, guinea pig, generally overestimate human skin absorption/penetration. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Summary The effects of exercise, heat exposure or both on the percutaneous absorption of methyl salicylate were studied in 6 healthy volunteers. Exercise was performed to 30% ofVO2max, 45 min each hour for 6 h, at ambient temperatures of 22°C or 40°C. Systemic availability was assessed by measurement of plasma salicylate concentrations and cumulative urinary salicyluric acid excretion over an 8-h collection period. The absorption of methyl salicylate was increased to more than 3-times above control in subjects exercising in the heat. It is concluded that exercise and heat exposure, by increasing skin temperature, hydration and blood flow, enhance the percutaneous absorption of methyl salicylate. 相似文献
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目的:研究水杨酸甲酯(MS)在小猪皮肤中同时渗透和代谢特性及在皮肤匀浆中的代谢作用。方法:用Valin-Chien双室扩散池和HPLC法测定接受液中水杨酸甲酯和代谢物水杨酸(SA)的浓度;用猪皮肤于磷酸缓冲液中匀浆,将匀将液于37℃保温,定时取样,用HPLC测定水杨酸甲酸及代谢物的浓度。结果:不同浓度的水杨酸甲酯在皮肤渗透时均有一定 程度的代谢,速率(flux)随着供给池浓度增加而增加,在高浓度时达到一平台;水杨酸甲酯的浓度在加入皮肤匀浆后逐渐降低,说明是由皮肤中酶水解所致。结论:水杨酸甲酯在皮肤渗透及皮肤匀浆中,具有一定的代谢。 相似文献