Application of XPS and ToF-SIMS for surface chemical analysis of DNA microarrays and their substrates

被引：26

作者：

Graf, Nora ^{[1
]}

Gross, Thomas ^{[1
]}

Wirth, Thomas ^{[1
]}

Weigel, Wilfried ^{[2
]}

Unger, Wolfgang E. S. ^{[1
]}

机构：

[1] BAM Fed Inst Mat Res & Testing, D-12203 Berlin, Germany

[2] Scienion AG, D-12489 Berlin, Germany

来源：

ANALYTICAL AND BIOANALYTICAL CHEMISTRY | 2009年 / 393卷 / 08期

关键词：

Microarrays; Surface analysis; XPS; ToF-SIMS; Chemical imaging; PNA MICROARRAYS; FLUORESCENCE; SPECTROSCOPY; DIAGNOSTICS; COVERAGE; SCIENCE; NEXAFS;

D O I：

10.1007/s00216-009-2599-x

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The chemical composition of the functional surfaces of substrates used for microarrays is one of the important parameters that determine the quality of a microarray experiment. In addition to the commonly used contact angle measurements to determine the wettability of functionalized supports, X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) are more specific methods to elucidate details about the chemical surface constitution. XPS yields information about the atomic composition of the surface, whereas from ToF-SIMS, information on the molecular species on the surface can be concluded. Applied on printed DNA microarrays, both techniques provide impressive chemical images down to the micrometer scale and can be utilized for label-free spot detection and characterization. Detailed information about the chemical constitution of single spots of microarrays can be obtained by high-resolution XPS imaging.

引用

页码：1907 / 1912

页数：6

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