首页> 美国卫生研究院文献>Journal of Vacuum Science and Technology. B Nanotechnology Microelectronics >Probing albumin adsorption onto calcium phosphates by x-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry
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Probing albumin adsorption onto calcium phosphates by x-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry

机译:通过X射线光电子能谱和飞行时间二次离子质谱分析探测白蛋白在磷酸钙上的吸附

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摘要

In this study the binding and assembly of bovine serum albumin (BSA) onto three different calcium phosphate phases (hydroxyapatite, dibasic calcium phosphate dihydrate, and β-tricalcium phosphate) was investigated using a combination of x-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). XPS was used to record adsorption isotherms and to quantify the amount of BSA adsorbed onto the different CaP surfaces. On all three surfaces, a monolayer of adsorbed BSA was formed. ToF-SIMS was then used to investigate how the structure of BSA changes upon surface binding. ToF-SIMS data from BSA films on the three CaP surfaces showed intensity differences of secondary ions originating from both hydrophobic and hydrophilic amino acids. For a more quantitative examination of structural changes, the authors developed a ratio comparing the sum of intensities of secondary ions from hydrophobic and hydrophilic residues. A small, but statistically significant, increase in the value of this ratio (7%) was observed between a BSA film on hydroxyapatite versus dibasic calcium phosphate dihydrate. From this ratio, the authors can make some initial hypotheses about what specific changes in BSA structure relate to these differences observed in the ToF-SIMS data.
机译:在这项研究中,结合使用X射线光电子能谱(XPS)和时间研究了牛血清白蛋白(BSA)在三种不同的磷酸钙相(羟基磷灰石,磷酸氢钙二水合物和β-磷酸三钙)上的结合和组装。飞行二次离子质谱仪(ToF-SIMS)。 XPS用于记录吸附等温线,并量化吸附在不同CaP表面上的BSA的量。在所有三个表面上,形成了一层吸附的BSA。然后使用ToF-SIMS研究表面结合后BSA的结构如何变化。来自三个CaP表面的BSA膜的ToF-SIMS数据显示了源自疏水和亲水氨基酸的次级离子的强度差异。为了更定量地检查结构变化,作者开发了一个比率,用于比较来自疏水和亲水残基的次级离子强度的总和。在羟基磷灰石上的BSA膜与磷酸氢钙二水合物之间的BSA膜之间观察到该比率值的增加很小,但具有统计学意义(7%)。从这个比率,作者可以对BSA结构中的哪些特定变化与ToF-SIMS数据中观察到的这些差异有一些初步的假设。

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