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Using Caco-2 Cells to Study Lipid Transport by the Intestine
Published on: August 20, 2015
Permeability studies of Kavalactones using a Caco-2 cell monolayer model
A Matthias1, J T Blanchfield, K G Penman
1MediHerb Research Laboratories, Brisbane, Queensland, Australia.
Journal of Clinical Pharmacy and Therapeutics
|May 11, 2007
Summary
Kavalactones are bioavailable and cross cell barriers effectively. Extraction methods (ethanol vs. water) do not significantly alter kavalactone bioavailability, suggesting other factors influence extract efficacy.
Area of Science:
- Pharmacology
- Natural Products Chemistry
Background:
- Kavalactones are the primary active compounds in kava.
- Understanding kavalactone bioavailability is crucial for assessing kava's therapeutic potential and safety.
- Variations in kava extracts may arise from different extraction methods and chemical compositions.
Purpose of the Study:
- To investigate the in vitro bioavailability of kavalactones.
- To determine if chemical structure or extraction method influences kavalactone bioavailability.
Main Methods:
- Utilized Caco-2 cell monolayers to model intestinal absorption.
- Measured kavalactone concentrations via high-performance liquid chromatography (HPLC).
- Assessed apparent permeability (P(app)) over 150 minutes.
Main Results:
- Kavalactones demonstrated significant potential bioavailability, readily crossing Caco-2 monolayers.
- Apparent permeabilities (P(app)) exceeded 42 x 10(-6) cm/s, with over 70% crossing within 90 minutes.
- Extraction method influenced bioavailability, with ethanol extracts showing higher P(app) for kawain compared to water extracts or isolated kavalactone.
Conclusions:
- Extraction method (ethanol vs. water) affects total kavalactone concentration but not relative bioavailability.
- Differences in kava extract efficacy are not primarily due to variations in kavalactone bioavailability.
- Extraction method does not significantly impact kavalactone bioavailability, thus not explaining differing propensities for liver damage.
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