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Related Concept Videos

Methods for Studying Drug Absorption: In vitro01:16

Methods for Studying Drug Absorption: In vitro

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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
The diffusion cell method uses a two-compartment cell, including a donor compartment with the drug solution, which simulates the environment where the drug is applied, and a receptor compartment with a buffer solution, which simulates the environment...
844

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Related Experiment Video

Updated: May 2, 2026

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Simple In Vitro 18O Labeling for Improved Mass Spectrometry-Based Drug Metabolites Identification: Deep Drug

Boris Tupertsev1,2, Sergey Osipenko3, Albert Kireev1

  • 1Center of Molecular and Cellular Biology (CMCB), Skolkovo Institute of Science and Technology, Nobel Str., 3, 121205 Moscow, Russia.

International Journal of Molecular Sciences
|March 11, 2023
PubMed
Summary

This study introduces a novel biocatalytic method using oxygen-18 isotope labeling for enhanced drug metabolite identification. This approach significantly improves the accuracy and confidence in discovering unknown drug metabolites in preclinical research.

Keywords:
18Odrug metabolismmass spectrometrymetabolites identification

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Area of Science:

  • Pharmacology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Drug metabolite identification is crucial in preclinical research for understanding metabolic pathways.
  • Current methods using HPLC-MS often struggle with compound identification, especially without reference materials.
  • Existing isotope labeling techniques can be complex and synthetically challenging.

Purpose of the Study:

  • To develop a more reliable method for identifying drug metabolites.
  • To overcome limitations in current compound identification techniques.
  • To enhance the confidence in interpreting mass spectrometry-based metabolism data.

Main Methods:

  • Biocatalytic insertion of oxygen-18 isotope using liver microsomes and 18O2.
  • High-resolution mass spectrometry (HPLC-MS) for metabolite detection.
  • Analysis of drug metabolism using bupivacaine as a model compound.

Main Results:

  • Successfully discovered and annotated over 20 previously unknown metabolites of bupivacaine.
  • Demonstrated the effectiveness of oxygen-18 isotope labeling in metabolite identification.
  • Validated the approach in the absence of reference standards.

Conclusions:

  • The proposed biocatalytic oxygen-18 labeling method significantly improves drug metabolite identification confidence.
  • This technique offers a powerful tool for discovering novel metabolites in complex biological systems.
  • The approach enhances the interpretation of mass spectrometric metabolism data in drug discovery.