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Dityrosine: preparation, isolation, and analysis

D A Malencik1, J F Sprouse, C A Swanson

  • 1Department of Biochemistry and Biophysics, Oregon State University, Corvallis 97331, USA.

Analytical Biochemistry
|November 15, 1996
PubMed
Summary
This summary is machine-generated.

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This study presents advanced chromatographic and spectroscopic methods for preparing and analyzing dityrosine. These techniques enable efficient isolation and purity verification of dityrosine, crucial for various biochemical applications.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Chromatography

Background:

  • Dityrosine is a cross-linked tyrosine derivative with significant biological implications.
  • Efficient preparation and analysis methods are crucial for studying dityrosine.

Purpose of the Study:

  • To describe novel chromatographic and spectroscopic techniques for dityrosine preparation, isolation, and analysis.
  • To establish reliable methods for quantifying dityrosine, even at trace levels.

Main Methods:

  • Enzyme-catalyzed oxidation of tyrosine followed by a three-step chromatographic purification.
  • DEAE-cellulose chromatography, two-dimensional pH-dependent chromatography on BioGel P-2, and affinity chromatography on immobilized phenyl boronate.
  • Analysis using elemental analysis, fast atom bombardment mass spectrometry, and two types of reverse-phase high-performance liquid chromatography (HPLC).

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Main Results:

  • Preparation of over 120 mg of dityrosine with a yield greater than 26%.
  • Purified dityrosine achieved approximately 92% purity by weight.
  • Development of two new reverse-phase HPLC techniques capable of analyzing picomole quantities.

Conclusions:

  • The described chromatographic and spectroscopic methods are effective for dityrosine preparation, isolation, and analysis.
  • pH-dependent chromatography and affinity chromatography offer versatile approaches for dityrosine isolation.
  • Novel HPLC techniques significantly enhance the sensitivity and efficiency of dityrosine analysis, particularly for trace amounts.