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Related Experiment Videos

Spectroimmunochemistry using colloidal gold bioconjugates.

Alexander A Kamnev1, Lev A Dykman, Petros A Tarantilis

  • 1Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, 13 Prosp. Entuziastov, 410015 Saratov, Russia. aakamnev@ibppm.sgu.ru

Bioscience Reports
|March 15, 2003
PubMed
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Surface-enhanced infrared absorption (SEIRA) spectroscopy reveals how protein A on colloidal gold (CG) interacts with human immunoglobulin G (IgG). This method enables rapid detection of biospecific interactions for developing new diagnostic tests.

Area of Science:

  • Biophysical Chemistry
  • Spectroscopy
  • Immunochemistry

Background:

  • Surface-enhanced infrared absorption (SEIRA) spectroscopy is a sensitive technique for analyzing molecular vibrations.
  • Protein A is a bacterial protein commonly used in immunochemical assays.
  • Colloidal gold (CG) nanoparticles are widely used as labels and substrates in biosensing.

Purpose of the Study:

  • To investigate the effect of a metal surface on the vibrational modes of protein A using SEIRA spectroscopy.
  • To demonstrate the utility of SEIRA spectroscopy for detecting biospecific interactions between protein A and human immunoglobulin G (IgG).
  • To explore the potential of SEIRA spectroscopy for quality control of bioconjugates and development of diagnostic systems.

Main Methods:

  • Preparation of dry films of colloidal gold (CG) bioconjugates with protein A.

Related Experiment Videos

  • Analysis of SEIRA spectra of protein A-CG bioconjugates.
  • Investigation of SEIRA spectral changes upon binding of human immunoglobulin G (IgG) to protein A.

    • Main Results:

    • Characteristic protein bands (amide I, amide II, and other vibration modes) were significantly affected by the colloidal gold surface.
    • The biospecific interaction between protein A and IgG induced further substantial changes in the SEIRA spectra.
    • SEIRA spectroscopy proved effective for quality control of protein A-CG bioconjugates.

    Conclusions:

    • SEIRA spectroscopy is a valuable tool for quality control of protein A-CG bioconjugates.
    • SEIRA spectroscopy enables easy and rapid detection of biospecific immunochemical interactions.
    • The findings support the development of test systems for detecting various biospecific interactions using spectroimmunochemistry.