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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Nano-patterned SERS substrate: application for protein analysis vs. temperature.

Gobind Das1, Federico Mecarini, Francesco Gentile

  • 1Dipartimento di Medicina Sperimentale e Clinica, Lab BIONEM, Università Magna Graecia di Catanzaro, Catanzaro, Italy. gobind@unicz.it

Biosensors & Bioelectronics
|November 4, 2008
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel gold nanostructure surface-enhanced Raman scattering (SERS) substrate for sensitive protein analysis. This SERS substrate enables attomole detection and reveals subtle protein structural changes with temperature variations.

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Area of Science:

  • Nanotechnology
  • Spectroscopy
  • Biophysics

Background:

  • Surface-enhanced Raman scattering (SERS) is a powerful technique for molecular detection.
  • Developing reproducible and sensitive SERS substrates is crucial for advanced analytical applications.
  • Understanding protein conformational changes is vital in biochemistry and medicine.

Purpose of the Study:

  • To fabricate and characterize a novel nanostructure-based SERS substrate.
  • To assess the substrate's capability for sensitive detection of biomolecules.
  • To investigate temperature-induced structural alterations in various proteins using SERS.

Main Methods:

  • Fabrication of gold nanograin-aggregate structures using electro-plating and electron-beam lithography.
  • Characterization of nanostructures with diameters of 80-100 nm and interstitial gaps of 10-30 nm.
  • Utilizing 2D Raman correlation and difference Raman analysis for conformational change investigation.

Main Results:

  • Achieved reproducible generation of plasmon polaritons on the nanostructure SERS substrate.
  • Demonstrated potential for detecting myoglobin concentrations down to the attomole level.
  • Successfully monitored structural changes in lysozyme, ribonuclease-B, bovine serum albumin, and myoglobin across a temperature range of -65 to 90°C.

Conclusions:

  • The fabricated gold nanostructure SERS substrate offers enhanced sensitivity and reproducibility.
  • The substrate is effective for investigating subtle, temperature-dependent protein conformational dynamics.
  • Advanced Raman correlation analyses provide straightforward insights into protein thermodynamics.