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Related Concept Videos

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems01:19

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Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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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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Drug Metabolism: Phase I Reactions01:17

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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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Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
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Factors Affecting Drug Biotransformation: Physicochemical and Chemical Properties of Drugs01:21

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A drug's physicochemical properties fundamentally influence its metabolism. For instance, a drug's molecular size and shape critically determine its interaction with enzymes and transporters — larger drugs may face difficulty reaching enzyme active sites, altering their metabolic pathways. The pKa of a drug, which establishes its ionization state, can impact its solubility and absorption, thereby influencing metabolism.
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Related Experiment Video

Updated: Jun 11, 2025

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Polyphenols and metabolism: from present knowledge to future challenges.

Sergio Quesada-Vázquez1,2, Itziar Eseberri3, Francisco Les4,5

  • 1Eurecat, Centre Tecnològic de Catalunya, Unitat de Nutrició i Salut, Reus, 43204, Spain.

Journal of Physiology and Biochemistry
|October 8, 2024
PubMed
Summary

Dietary polyphenols show promise in reducing chronic diseases, but further research is needed. Future studies will focus on safety, bioavailability, and personalized nutrition for phenolic compounds.

Keywords:
InflammationMetabolomicsMetabotypeMicrobiotaPrebioticsSportToxicology

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Area of Science:

  • Nutritional Science
  • Biochemistry
  • Toxicology

Background:

  • Dietary polyphenols and phytonutrients are linked to reduced chronic disease risk.
  • A clear cause-and-effect relationship and understanding of various factors are still needed for general recommendations.
  • Research on phenolic compounds faces several challenges and requires further investigation.

Purpose of the Study:

  • To discuss future research challenges and opportunities in the field of dietary polyphenols.
  • To explore aspects like toxicology, synergistic effects, precision nutrition, and bioavailability.
  • To highlight emerging research areas such as gut microbiota interactions and computational studies.

Main Methods:

  • Review of current research and identification of future research directions.
  • Discussion of toxicological aspects and safety risk assessment for polyphenols.
  • Exploration of synergistic effects, metabotype-based nutritional advice, and innovative formulations.

Main Results:

  • Identified key challenges including safety assessment, synergistic effects, and precision nutrition.
  • Highlighted the importance of polyphenol-gut microbiota interactions and biotransformation.
  • Discussed advanced computational methods and novel delivery systems for polyphenols.

Conclusions:

  • Further research is crucial to fully understand the applications, risk assessment, and metabolic effects of dietary polyphenols.
  • Investigating polyphenol interactions with gut microbiota and employing advanced computational techniques will be vital.
  • Developing innovative formulations and personalized nutrition strategies will enhance the benefits of phenolic compounds.