A phase I reaction is a biochemical process that introduces a functionally reactive polar group to a substance. This transformation predominantly occurs in the liver, facilitated by the cytochrome P450 system of hemoproteins situated in the lipophilic endoplasmic reticulum of cells. The metabolite generated through this process can have varying polarities. If it is sufficiently polar, it can be easily excreted in the urine due to its water compatibility. However, if the metabolite is nonpolar,...

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Phase I Oxidative Reactions: Overview

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Phase I biotransformation, or functionalization, is a crucial chemical process that converts drugs and other xenobiotics into more water-soluble forms, facilitating expulsion from the body. It involves oxidative, reductive, and hydrolytic reactions that add or unveil polar functional groups on lipophilic substrates. Key players in phase I reactions are the mixed-function oxidases. Situated in liver cell microsomes, these enzymes predominantly carry out drug metabolism. They require molecular...

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Simulation Of Sildenafil Metabolism Using An Electrochemical Oxidation System

Simulation of sildenafil metabolism using an electrochemical oxidation system

Unyong Kim¹, Sumin Seo¹, Jiyu Kim¹

¹Department of Pharmaceutical Analysis, College of Pharmacy, Chung-Ang University, 84 Heukseok-Ro, Dongjak-Gu, Seoul 06974, Republic of Korea.

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences|June 14, 2025

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View abstract on PubMed

Summary

Electrochemical oxidation systems effectively mimic in vitro drug metabolism, identifying 96 sildenafil metabolites. This electrochemical approach offers a complementary tool for drug development and toxicity prediction.

Area of Science:

Pharmacology
Analytical Chemistry
Biochemistry

Background:

Drug metabolism studies are crucial for predicting drug toxicity during development.
Traditional methods use liver microsomes and hepatocytes to simulate Phase I metabolic reactions.
Electrochemical oxidation systems offer a novel alternative for simulating these reactions.

Purpose of the Study:

To simulate sildenafil metabolism using an electrochemical oxidation system.
To compare the metabolic profile generated electrochemically with that from human liver microsomes.
To evaluate the potential of electrochemical systems as complementary tools in drug metabolism research.

Main Methods:

Sildenafil metabolism was simulated using an electrochemical oxidation system.
Metabolic profiles were analyzed and compared using Pearson's correlation coefficient.
Mass spectrometry (MS) and tandem MS were employed for metabolite detection and structural elucidation.

Main Results:

A total of 96 metabolites and oxidation products were identified in both systems.
The electrochemical setup using a glassy carbon electrode (ammonium acetate, pH 8.0) showed the highest correlation with human liver microsome metabolism.
This specific electrochemical condition effectively mimicked in vitro microsomal metabolism at 25 μmol/L sildenafil.

Conclusions:

Electrochemical oxidation systems can effectively simulate in vitro drug metabolism.
These systems serve as valuable complementary tools to traditional methods like liver microsomes.
This research opens new avenues for advancing drug metabolism studies and predicting drug toxicity.

Keywords:

Electrochemical oxidation Mass spectrometry Metabolism Sildenafil