Protein adsorption on poly(N-isopropylacrylamide) brushes: dependence on grafting density and chain collapse.

Protein adsorption on poly(N-isopropylacrylamide) brushes: dependence on grafting density and chain collapse.
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DOI:
10.1021/la2001909
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发表时间:
2011-07-19
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Leckband DE
Leckband DE
中科院分区:
其他
文献类型:
--
作者:
Xue C;Yonet-Tanyeri N;Brouette N;Sferrazza M;Braun PV;Leckband DE

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研究了硅片接枝聚(N-异丙基丙烯酰胺)刷子的耐蛋白质性能与链相对分子质量、接枝密度和温度的关系。在32°C的低临界溶液温度(LCST)以上,用椭偏仪测定的水溶胀链的断裂取决于接枝密度和分子量。椭圆偏振、放射分析和荧光成像表明,在较低的临界溶液温度以下,刷子对蛋白质的排斥作用与端基环氧乙烷单层一样有效。在32°C以上,很低水平的蛋白质吸附在密集接枝的刷子上,并且随着刷子接枝密度的降低,吸附的蛋白质量增加。没有显示塌陷转变的刷子也结合蛋白质,即使链仍然延伸到LCST以上。这些发现提示了蛋白质与末端嫁接的PNIPAM刷子相互作用的可能机制。
The protein resistance of poly(N-isopropylacrylamide) brushes grafted from silicon wafers was investigated as a function of the chain molecular weight, grafting density, and temperature. Above the lower critical solution temperature (LCST) of 32°C, the collapse of the water swollen chains, determined by ellipsometry, depends on the grafting density and molecular weight. Ellipsometry, radio assay, and fluorescence imaging demonstrated that, below the lower critical solution temperature, the brushes repel protein as effectively as oligoethylene oxide terminated monolayers. Above 32°C, very low levels of protein adsorb on densely grafted brushes, and the amounts of adsorbed protein increase with decreasing brush grafting densities. Brushes that do not exhibit a collapse transition also bind protein, even though the chains remain extended above the LCST. These findings suggest possible mechanisms underlying protein interactions with end-grafted PNIPAM brushes.
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