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Functional Biointerfaces Based on Mixed Zwitterionic Self-Assembled Monolayers for Biosensing Applications.

Yu-Sin Wang, Shuehlin Yau1, Lai-Kwan Chau2

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Summary
This summary is machine-generated.

Zwitterionic carboxybetaine-thiols (CB-thiols) and sulfobetaine-thiols (SB-thiols) were synthesized to create functional self-assembled monolayers (SAMs) for biosensors. These modified surfaces enhance sensitivity and specificity in complex media, offering versatile antifouling properties for molecular recognition events.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Surface Chemistry

Background:

  • Biosensor performance, particularly sensitivity and specificity, is often limited in complex biological media.
  • Surface modification strategies are crucial for improving biosensor functionality and reducing non-specific adsorption (fouling).
  • Zwitterionic materials offer promising antifouling properties due to their charge distribution.

Purpose of the Study:

  • To synthesize and characterize zwitterionic carboxybetaine-thiols (CB-thiols) and sulfobetaine-thiols (SB-thiols) for modifying gold substrates.
  • To create functional self-assembled monolayers (SAMs) for enhanced immunoassay performance in surface plasmon resonance (SPR) biosensors.
  • To evaluate the antifouling properties and biomolecule immobilization capabilities of these zwitterionic SAMs.

Main Methods:

  • Synthesis of CB-thiols and SB-thiols.
  • Surface modification of gold substrates to form SAMs.
  • Characterization using X-ray photoelectron spectroscopy (XPS), contact angle goniometry, and cyclic voltammetry.
  • Assessment of antifouling properties via protein and bacterial adsorption studies.
  • Immunoassay development and performance evaluation on an SPR biosensor.

Main Results:

  • SB-thiol SAMs exhibited superior hydrophilicity, fouling resistance, and packing density compared to CB-thiol SAMs.
  • CB-thiols provided essential functional groups for biomolecule immobilization via amine coupling.
  • Mixed SAMs of CB- and SB-thiols successfully integrated antifouling and functionalization properties.
  • Zwitterionic mixed SAMs enabled efficient immobilization of biorecognition elements (BREs), leading to improved SPR biosensor sensitivity and specificity.

Conclusions:

  • Zwitterionic mixed SAMs comprising CB- and SB-thiols offer excellent versatility, antifouling capabilities, and functionalizability for biosensing.
  • This surface chemistry is highly effective for improving the performance of SPR biosensors in complex media.
  • The developed surface modification strategy is broadly applicable for monitoring specific molecular recognition events.