title: Suppression of non-specific adsorption using densified tri(ethylene glycol) alkanethiols: monolayer characteristics evaluated by electrochemical measurements.
abstract: Tri(ethylene glycol) terminated short alkylchain thiols (TEGCnSHs) offer good potential for constructing ultra-thin protein-resistant monolayers because they have an alkylchain for forming a densely packed monolayer and a flexible-hydrophilic oligo ethylene glycol arm for avoiding non-specific adsorption. Hybrid monolayers consisting of TEGCnSH and a maltoside ligand (MalC12SH, for capturing lectin) were effective in detecting concanavalin A (Con A). This hybrid monolayer was more suitable for Con A detection than that modified with 100% ligands in terms of the detection limit and time. The anti-fouling properties, packing densities, interaction and homogeneity of TEGCnSH monolayers were confirmed in detail by surface plasmon resonance (SPR) measurements and electrochemical methods. SPR measurements revealed their excellent repellency to proteins and peptides of various sizes (M(W) 400-104000). The electrochemical results indicated that the lower defects in the TEGCnSH monolayers suppressed the permeation of small peptides. The stability, homogeneity and packing density of the TEGCnSH monolayers were gradually improved as their alkylchain length increased.
authors.affiliation: National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan.
authors.forename: Kyoko
authors.initials: K
authors.lastname: Yoshioka
authors.forename: Yukari
authors.initials: Y
authors.lastname: Sato
authors.forename: Mutsuo
authors.initials: M
authors.lastname: Tanaka
authors.forename: Teiichi
authors.initials: T
authors.lastname: Murakami
authors.forename: Osamu
authors.initials: O
authors.lastname: Niwa
mesh_terms: D000327:Adsorption; D000473:Alkanes / Q000737:chemistry; D003208:Concanavalin A / Q000737:chemistry; D004563:Electrochemistry; D005026:Ethylene Glycols / Q000737:chemistry*; D008567:Membranes, Artificial; D008970:Molecular Weight; D010455:Peptides / Q000737:chemistry; D011506:Proteins / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry*
chemical_list: D000473:Alkanes; D005026:Ethylene Glycols; D008567:Membranes, Artificial; D010455:Peptides; D011506:Proteins; D013438:Sulfhydryl Compounds; D003208:Concanavalin A