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Updated: Aug 6, 2026

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade
Published on: August 14, 2019
Mechanism-resolved structure-activity relationships in flavonoid antioxidants enabled by tail-assisted ESIPT and
Bifa Cao1, Xinru Zhang1, Qiao Zhou2
1Basic Courses Department, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China.
This study introduces a novel tail-assisted proton transfer method to enhance antioxidant activity in flavonoids without consuming key hydroxyl groups. This design strategy improves antioxidant performance by leveraging folded molecular conformations and excited-state intramolecular proton transfer (ESIPT).
Area of Science:
- Medicinal Chemistry
- Photochemistry
- Computational Chemistry
Background:
- Excited-state intramolecular proton transfer (ESIPT) enhances flavonoid photochemistry and antioxidant properties.
- Natural flavonoids are often ESIPT-inactive, and active ones consume crucial phenolic hydroxyl groups for radical scavenging.
Purpose of the Study:
- To design a strategy decoupling ESIPT from phenolic hydroxyl consumption for enhanced antioxidant activity.
- To investigate tail-assisted proton transfer pathways for dual-mode antioxidant enhancement.
Main Methods:
- Density Functional Theory (DFT) and Time-Dependent DFT (TD-DFT) calculations.
- Investigation of butin and 6,7,4'-trihydroxyisoflavone derivatives with tail modifications.
- Structure-activity relationship (SAR) analysis.
Main Results:
- Tail modification and folded conformations significantly enhance antioxidant performance.
- The study elucidates the negligible contribution of twisted intramolecular charge transfer to antioxidant activity.
- An experimentally grounded SAR framework for tail-assisted ESIPT and antioxidant activity is established.
Conclusions:
- A novel design strategy enables dual-mode antioxidant enhancement in flavonoids via tail-assisted ESIPT.
- Spatially folded conformations are crucial for efficient intramolecular interactions and improved antioxidant activity.
- This research provides a blueprint for developing next-generation antioxidant drugs with enhanced pharmacological potential.
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