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QCM/HCC as a platform for detecting the binding of warfarin to an immobilized film of human serum albumin

机译:QCM / HCC作为检测华法林与人血清白蛋白固定膜结合的平台

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摘要

Quartz crystal microbalance/heat conduction calorimetry (QCM/HCC) is a new measurement technology that has been used to monitor simultaneously the mass and motional resistance of a thin film in conjunction with the heat flow produced by a chemical change in the film initiated by reaction with a gas.In this work we examine the applicability of the QCM/HCC in detecting chemical changes at the solution/thin film interface.Human serum albumin (HSA) was bound to the gold electrode of a 5 MHz AT-cut quartz resonator using three types of linkers and then exposed to buffered solutions of the anticoagulant drug warfarin.Changes in resonator frequency and motional resistance as well as changes in heat flow produced by warfarin binding to HSA were monitored as a function of the warfarin concentration.Differences in frequency and motional resistance changes depend upon the linker and vary both in magnitude and sign,whereas the integrated heat signal is proportional to the concentration of warfarin and independent of the linker chemistry.Quartz crystal microbalance/ heat conduction calorimetry can thus be a useful tool for studying protein-ligand interactions at the solution-surface interface,even though the quartz resonator does not behave as a microbalance.
机译:石英晶体微天平/热传导量热法(QCM / HCC)是一种新的测量技术,已被用于同时监测薄膜的质量和运动阻力,以及由反应引发的薄膜化学变化产生的热流在这项工作中,我们研究了QCM / HCC在检测溶液/薄膜界面的化学变化中的适用性。人血清白蛋白(HSA)结合到5 MHz AT切割石英谐振器的金电极上,使用三种类型的接头,然后将其暴露于抗凝药物华法林的缓冲溶液中。根据华法林浓度,监测共振器频率和运动阻力的变化以及由华法林与HSA结合产生的热流的变化。运动阻力的变化取决于连接体,并且在大小和符号上都变化,而综合的热信号与华法林的浓度成正比因此,石英晶体微量天平/导热量热法可以作为研究溶液-表面界面处蛋白质-配体相互作用的有用工具,即使石英共振器的行为不像微量天平。

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