title: Comparison of Mannose, Ethylene Glycol, and Methoxy-Terminated Diluents on Specificity and Selectivity of Electrochemical Peptide-Based Sensors.
abstract: We report the synthesis and application of three new antifouling diluents for the fabrication of an E-PB HIV sensor. Among the three thiolated antifouling diluents used in this study, the methoxy-terminated diluent (C6-MEG) is the most effective in alleviating both nonspecific binding and adsorption of matrix contaminants onto the sensor surface, especially when compared to the mannose- (C6-MAN) and ethylene-glycol-terminated (C6-EG) diluents. The sensor fabricated with C6-MEG has a specificity factor (∼13.5) substantially higher than the sensor passivated with only 6-mercapto-1-hexanol (∼1.5). It is functional even when employed directly in 25% serum, an achievement that has not been observed with this class of E-PB sensors. More importantly, incorporation of these antifouling diluents has negligible impact on other important sensor properties such as sensitivity and binding kinetics. This sensor passivation strategy is versatile and can potentially be used with other E-PB sensors, as well as surface-based sensors that utilize thiol-gold self-assembled monolayer chemistry.
authors.affiliation: †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States.
authors.forename: Anita J
authors.initials: AJ
authors.lastname: Zaitouna
authors.affiliation: †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States.
authors.forename: Jesse
authors.initials: J
authors.lastname: Joyce
authors.affiliation: †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States.
authors.forename: Ronald L
authors.initials: RL
authors.lastname: Cerny
authors.affiliation: †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States.
authors.forename: Patrick H
authors.initials: PH
authors.lastname: Dussault
authors.affiliation: †Department of Chemistry, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0304, United States.
authors.forename: Rebecca Y
authors.initials: RY
authors.lastname: Lai
mesh_terms: D055664:Electrochemical Techniques / Q000295:instrumentation*; D019855:Ethylene Glycol / Q000032:analysis*; D057230:Limit of Detection; D008358:Mannose / Q000032:analysis*; D010455:Peptides / Q000737:chemistry*
chemical_list: D010455:Peptides; D019855:Ethylene Glycol; D008358:Mannose