TITLE

Effect of the immobilisation of DNA aptamers on the detection of thrombin by means of surface plasmon resonance

AUTHOR(S)
Ostatná, Veronika; Vaisocherová, Hana; Homola, Jiří; Hianik, Tibor
PUB. DATE
July 2008
SOURCE
Analytical & Bioanalytical Chemistry;Jul2008, Vol. 391 Issue 5, p1861
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report a multichannel surface plasmon resonance (SPR) sensor for detection of thrombin via DNA aptamers immobilized on the SPR sensor surface. A detailed investigation of the effect of the immobilisation method on the interaction between thrombin and DNA aptamers is presented. Three basic approaches to the immobilisation of aptamers on the surface of the SPR sensor are examined: (i) immobilisation based on chemisorption of aptamers modified with SH groups, (ii) immobilisation of biotin-tagged aptamers via previously immobilized avidin, neutravidin or streptavidin molecular linkers, and (iii) immobilisation employing dendrimers as a support layer for subsequent immobilisation of aptamers. A level of nonspecific binding of thrombin to immobilized human serum albumin (HSA) for each of the immobilisation methods is determined. Immobilisation of aptamers by means of the streptavidin–biotin system yields the best results both in terms of sensor specificity and sensitivity.
ACCESSION #
32679625

 

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