Quantitative label-free characterization of avidin-biotin assemblies on silanized glass.
Quantitative label-free characterization of avidin-biotin assemblies on silanized glass.
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DOI:
10.1021/ac2016085
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发表时间:
2011-09-15
影响因子:
7.4
通讯作者:
Schweikert, Emile A.
中科院分区:
文献类型:
--
作者:
Chen, Li-Jung;Seo, Jeong Hyun;Eller, Michael J.;Verkhoturov, Stanislav V.;Shah, Sunny S.;Revzin, Alexander;Schweikert, Emile A.
In this study, a ToF-SIMS operating in the event-by-event bombardment/detection mode was used to characterize avidin-biotin assemblies on silane-modified glass substrates. SIMS was used to analyze several variants of the biointerface, including avidin physically adsorbed on a monofunctional acryl silane surface and covalently attached on a mono-functional (amine terminated) and a bi-functional (amine and acryl terminated) silanes. The goal of these studies was to determine density of avidin and biotin layers chemical or physically adsorbed on silanized glass substrate. An individual impact of a C60 projectile used in this study creates a hemispherical crater (~10 nm in diameter) and emits large numbers of secondary ions from the same nanovolume. Thus, a single impact enables to unfold distinct secondary ions that span the thickness of the assembled film. This method was used to monitor presence of glass, silane and protein ions and to estimate the thickness and density of the avidin layer. In addition, we employed double coincidence mass spectrometry approach to identify ions co-emitted from a specific stratum of the biointerface. This approach was used to determine density of biotin and avidin immobilization while eliminating interferences from isobaric ions that originated from other constituents on the surface. Overall, novel ToF-SIMS quantitative approaches employed here were useful for examining complex biointerface and determining both lateral and in depth composition of the film.
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DOI:
10.1021/la803635r
发表时间:
2009-04-09
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
作者:
Lee JY;Shah SS;Yan J;Howland MC;Parikh AN;Pan T;Revzin A
通讯作者:
Revzin A
影响因子:
5.7
作者:
Fernandez-Lima, F. A.;Eller, M. J.;Schweikert, E. A.
通讯作者:
Schweikert, E. A.
影响因子:
10.8
作者:
Gunnarsson, Anders;Sjovall, Peter;Hook, Fredrik
通讯作者:
Hook, Fredrik
DOI:
10.1016/0168-583x(93)96034-a
发表时间:
1993-07-01
影响因子:
1.3
作者:
RAY, KB;PARK, MA;SCHWEIKERT, EA
通讯作者:
SCHWEIKERT, EA
影响因子:
3.7
作者:
Verkhoturov, S. V.;Eller, M. J.;Schweikert, E. A.
通讯作者:
Schweikert, E. A.