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Rational design of a bisphenol A aptamer selective surface-enhanced Raman scattering nanoprobe.

Haley L Marks1, Michael V Pishko, George W Jackson

  • 1Department of Biomedical Engineering, Texas A&M University , College Station, Texas 77843, United States.

Analytical Chemistry
|October 21, 2014
PubMed
Summary
This summary is machine-generated.

Surface-enhanced Raman scattering (SERS) nanoprobes enable ultrasensitive detection of bisphenol A (BPA). This study details SERS nanoprobe design for quantifying BPA in blood, achieving a 3 nM limit of detection.

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Biomedical Engineering

Background:

  • Surface-enhanced Raman scattering (SERS) nanoprobes are valuable for ultrasensitive analyte detection.
  • Functionalized colloidal nanoparticles serve as versatile platforms for assay development, enabling conjugation with spectral tags and biorecognition elements.
  • Bisphenol A (BPA) is an environmental toxin found in food and beverage packaging, necessitating accurate quantification methods.

Purpose of the Study:

  • To design and characterize a SERS-active nanoprobe for detecting bisphenol A (BPA).
  • To investigate the nanoprobe's biorecognition capabilities for use in a competitive binding assay for BPA quantification in blood.
  • To demonstrate the utility of colloidal nanoparticles as multifunctional assay components.

Main Methods:

  • Design and synthesis of SERS-active colloidal nanoprobes.
  • Conjugation of nanoprobes with BPA-specific aptamers for biorecognition.
  • Characterization of nanoprobe affinity using dissociation constant (Kd) measurements.
  • Development of a competitive binding assay utilizing SERS spectra for BPA quantification.

Main Results:

  • The developed SERS nanoprobes exhibited specific affinity for a BPA aptamer with a dissociation constant (Kd) of 54 nM.
  • The nanoprobes provided dose-dependent SERS spectra, indicating their responsiveness to varying BPA concentrations.
  • A limit of detection of 3 nM for BPA was achieved using the SERS nanoprobe assay.
  • The conjugation approach demonstrated the dual role of nanoparticles as spectral tags and biorecognition ligands.

Conclusions:

  • SERS optical nanoprobes are effective tools for ultrasensitive detection of analytes like BPA.
  • The designed nanoprobe platform demonstrates specific biorecognition and enables quantitative analysis of BPA in biological samples.
  • Colloidal nanoparticles offer a versatile and multifunctional approach for advanced assay development in diagnostics and environmental monitoring.