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Nonionic micellar liquid chromatography coupled to immobilized enzyme reactors.

S Tomer1, J G Dorsey, A Berthod

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Immobilized enzyme reactors coupled with micellar liquid chromatography enhance analyte detection. This method offers sensitive detection of amino acids and cholesterol, maintaining enzyme activity for extended periods.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry

Background:

  • Immobilized enzyme reactors are crucial for post-column analyte detection.
  • Traditional methods face limitations in sensitivity and enzyme stability.

Purpose of the Study:

  • To develop and evaluate immobilized enzyme reactors for sensitive amino acid and cholesterol detection.
  • To assess the compatibility of micellar liquid chromatography with enzymatic detection.

Main Methods:

  • Preparation of porous glass beads with immobilized amino acid oxidase and cholesterol oxidase.
  • Coupling enzymatic reactors with micellar liquid chromatography using non-ionic Brij 35 phases.
  • Detection of amino acids via homovanilic dimer fluorescence and cholesterol via UV absorbance.

Main Results:

  • Achieved limits of detection of 32 pmol for methionine and 50 pmol for 20alpha-hydroxy cholesterol.
  • Non-ionic micellar phases preserved enzyme activity longer than conventional mobile phases.
  • Immobilized enzyme reactors maintained activity for continuous use over a week.

Conclusions:

  • The combination of immobilized enzyme reactors and micellar liquid chromatography provides sensitive and stable analytical methods.
  • Non-ionic micellar phases are advantageous for maintaining enzyme stability and activity.
  • This approach offers a viable alternative for detecting low levels of amino acids and cholesterol.