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• W2011567475 abstract "The kinetics of adsorption and desorption of two highly asymmetrical model peptides were studied at methyl- and carboxylic acid-terminated alkylthiolate self-assembled monolayer (SAM) surfaces on gold. The model peptides were leucine-lysine (LK), α-helical (LKα14), and β-strand (LKβ15) peptides that have a well-defined secondary structure with the leucines localized on one side and the lysines on the other side. These secondary structures were previously shown to be maintained after adsorption and to control LK peptide orientation on these surfaces. The kinetics of peptide adsorption were analyzed by surface plasmon resonance as a function of peptide solution concentrations at pH 7.4. Peptide desorption was measured by rinsing with a buffer at various times along the adsorption curve. Both peptides had a saturation coverage of approximately 1 ML (monolayer) on the carboxyl SAM. Both peptides exhibited mostly irreversible binding on both surfaces, but the LKα14 peptide showed some limited reversible binding. Reversibly bound peptides could be in the second adlayer interacting only with peptides in the first layer or peptides interacting with a partially covered adsorption site and therefore not able to fully bind to the SAM surface. The near complete lack of reversible binding for LKβ15 is possibly due to strong peptide-peptide hydrogen bonding in β-sheet structures within the adsorbed layer. For a given dose of either peptide, much less peptide adsorbed on the methyl SAMs. The adsorption rate of irreversibly bound LKα14 on carboxylic acid SAMs was first-order with respect to solution concentration. Both peptides showed nucleation-like adsorption kinetics on the carboxylic acid SAM, indicating that peptide-peptide bonding is needed to stabilize the adsorbed layer. Adsorption on the methyl SAM was much lower in quantity for both peptides and seemed to require prior aggregation of the proteins in solution, at least for LKβ15." @default.
• W2011567475 created "2016-06-24" @default.
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• W2011567475 date "2010-12-01" @default.
• W2011567475 modified "2023-10-09" @default.
• W2011567475 title "Kinetics of leucine-lysine peptide adsorption and desorption at -CH₃ and -COOH terminated alkylthiolate monolayers" @default.
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• W2011567475 doi "https://doi.org/10.1116/1.3494080" @default.
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