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Related Experiment Videos

Isotope edited internal standard method for quantitative surface-enhanced Raman spectroscopy.

Dongmao Zhang1, Yong Xie, Shirshendu K Deb

  • 1Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA. zhang17@purdue.edu

Analytical Chemistry
|June 1, 2005
PubMed
Summary

A novel isotope edited internal standard (IEIS) method enhances quantitative surface-enhanced Raman spectroscopy (SERS) measurements. This technique achieves high accuracy and reproducibility for chemical analysis, improving upon traditional methods.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Nanotechnology

Background:

  • Quantitative analysis using Surface-Enhanced Raman Spectroscopy (SERS) requires robust internal standards for accuracy.
  • Traditional internal standards may not perfectly mimic the analyte's behavior, limiting precision.
  • Isotopically labeled compounds offer a promising alternative for internal standardization.

Purpose of the Study:

  • To develop and validate a new Isotope Edited Internal Standard (IEIS) method for quantitative SERS.
  • To assess the reproducibility and accuracy of the IEIS method under both resonance (SERRS) and non-resonance (SERS) conditions.
  • To demonstrate the superiority of the IEIS method compared to absolute intensity calibration and non-isotopic internal standards.

Main Methods:

Related Experiment Videos

  • Utilized deuterium-edited rhodamine 6G (R6G-d4) as an internal standard for rhodamine 6G (R6G-d0) quantification.
  • Investigated the IEIS method's performance across a wide concentration range (200 pM–2 microM).
  • Compared IEIS results with absolute SERS/SERRS intensity calibration and adenine as an internal standard.

    • Main Results:

    • Achieved batch-to-batch concentration measurement reproducibility better than 3% using the IEIS method.
    • Demonstrated reliable quantification even with a threefold difference in analyte and internal standard concentrations.
    • IEIS method showed superior performance compared to absolute calibration and non-isotopic internal standards.

    Conclusions:

    • The IEIS method provides a highly accurate and reproducible approach for quantitative SERS analysis.
    • This technique offers significant advantages over existing methods, particularly in complex sample matrices.
    • IEIS holds potential for applications in gene expression analysis and comparative proteomics.