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Dihydrochalcone metabolism in the rat: phloretin
Xenobiotica; the Fate of Foreign Compounds in Biological Systems
|December 1, 1984
Summary
Phloretin metabolism in rats primarily involves degradation into phloroglucinol and phloretic acid, which are then excreted. Rat gut microbes contribute to this breakdown, influencing flavonoid metabolism pathways.
Area of Science:
- Pharmacokinetics and Drug Metabolism
- Natural Product Chemistry
- Gastrointestinal Microbiology
Background:
- Phloretin, a dihydrochalcone found in apples, has potential health benefits.
- Understanding its metabolic fate is crucial for evaluating its bioavailability and efficacy.
- Limited information exists on the specific metabolic pathways of phloretin in vivo.
Purpose of the Study:
- To investigate the metabolic fate and excretion of phloretin in rats.
- To identify the major metabolites of phloretin.
- To explore the role of gut microflora in phloretin metabolism.
Main Methods:
- Intragastric administration of phloretin to rats.
- Urine collection and analysis for phloretin and its metabolites.
- In vitro incubation of phloretin with rat caecal micro-organisms.
- Chromatographic and spectroscopic techniques for metabolite identification.
Main Results:
- Approximately 50% of the phloretin dose was excreted in urine within two days.
- Major urinary metabolites included phloroglucinol and phloretic acid, along with its conjugates.
- Rat caecal micro-organisms degraded phloretin into phloroglucinol and phloretic acid.
Conclusions:
- Phloretin undergoes significant degradation in rats, with gut microflora playing a key role.
- The primary metabolic pathway involves breakdown to phloroglucinol and phloretic acid.
- These findings contribute to understanding the metabolism of dihydrochalcones and flavonoids.