Surface gold-coated microarrays

One further development of this approach has been to link chelating iminodiacetic acid groups to PEG, which in turn can be bound by Cu ions and so provide a highly specific binding site for Hisj-tagged proteins (Cha et al., 2004). Another variation is gold-coated microarrays, which have the advantage that they can be combined with surface plasma resonance (SPR) and MS for further detection and analysis of the captured molecules (Bieri et al., 1999 Houseman et... 

For microarray work, PLL-PEG-biotin-sAV monolayers adsorbed onto underlying titanium dioxide surfaces (pillars) replaced the b-SAM gold-coated glass surface. While oriented capture agents out-performed their random counterparts, distinct differences in Fab and antibody performance between this new surface and the b-SAM surface were apparent. 

Other hydrophihc polymers have been conceived as alternatives to dextran [6]. For example, polyvinyl alcohol and polyacryl acid derivatives are feasible and graft combinations thereof have been shown to be applicable to SPR detection [14]. Poly-L-lysine has become popular for DNA microarray coatings, due to its highly positive charge. It has also been attached to SAM-derivatized gold surfaces for subsequent modification with thiol reactive groups [15]. 

Zhi ZL, Powell AK, Turnbull JE. Fabrication of carbohydrate microarrays on gold surfaces direct attachment of nonderivatized oligosaccharides to hydra-zide-modified self-assembled monolayers. Anal Chem 2006 78 4786-4793. Lee M, Shin I. Facile preparation of carbohydrate microarrays by site-specific, covalent immobilization of unmodified carbohydrates on hydrazide-coated glass slides. Org Lett 2005 7 4269-4272. 

---