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Spectral and HPLC Analyses of Synthesized Butin and Butein
Takashi Kamei1,2, Jun Miyazaki3, Ryoga Hori4
1Faculty of Pharmaceutical Sciences, Hokuriku University.
Chemical & Pharmaceutical Bulletin
|July 7, 2024
Summary
This study characterizes butin and butein, plant-derived flavanones, detailing their spectral properties and stability. It establishes methods to distinguish these tautomers and synthesize challenging S-butin isomers.
Area of Science:
- Natural Product Chemistry
- Flavonoid Research
- Spectroscopy and Chromatography
Background:
- Butin and butein are plant-derived bioactive flavanones with tautomeric forms.
- Their distinct physicochemical properties and spectral behaviors remain largely uncharacterized.
- Established methods for differentiating these tautomers are lacking.
Purpose of the Study:
- To determine the basic properties of butin and butein.
- To establish spectroscopic and chromatographic methods for distinguishing between butin and butein.
- To assess the stability and enable the synthesis of specific isomers.
Main Methods:
- UV-Vis spectrophotometry in various solvents and aqueous solutions (pH-dependent).
- Computational modeling to analyze spectral shifts.
- Reversed-phase high-performance liquid chromatography (HPLC) for stability assessment.
- Chiral HPLC for isomer separation.
Main Results:
- Spectra of butin and butein were characterized across different polarities and pH values.
- Solvent and pH effects on spectra were elucidated through experimental and computational analysis.
- Butein demonstrated lower structural stability than butin in culture media.
- Chiral HPLC successfully separated butin into R- and S-isomers.
Conclusions:
- Physicochemical and spectral properties of butin and butein were defined.
- HPLC methods were developed for distinguishing tautomers and assessing stability.
- The study facilitates the targeted synthesis of S-butin, overcoming isolation challenges.
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