Dietary substances and their glucuronides: structures, occurrence and biological activity

Area of Science:

• Nutritional Biochemistry
• Pharmacology
• Natural Product Chemistry

Background:

• Plant-derived polyphenols are abundant in diets and possess antioxidant, anti-cancer, and anti-inflammatory properties.
• Their in vitro activities often lack clear correlation with in vivo performance.
• Phenols undergo phase II metabolism, forming glucuronides and sulfates, questioning the active species.

Purpose of the Study:

• To determine if dietary polyphenol metabolites, particularly glucuronides, exhibit distinct biological activities.
• To compare the activities of glucuronides with their parent polyphenol compounds.
• To provide insights into the metabolism and activity of dietary polyphenols.

Main Methods:

• Review of existing literature on polyphenol metabolism and activity.
• Analysis of enzyme inhibition and cell line interaction data for parent compounds and their metabolites.
• Discussion of glucuronidation processes and synthesis of glucuronides.

Main Results:

• Polyphenol glucuronides may possess distinct activities separate from their parent compounds.
• Metabolism significantly influences the bioavailability and efficacy of dietary polyphenols.
• Synthesis and availability of specific glucuronides can be challenging.

Conclusions:

• Dietary polyphenol metabolites, especially glucuronides, can have unique biological functions.
• Understanding metabolism is crucial for elucidating the true health benefits of dietary polyphenols.
• Further research is needed on the specific activities of various polyphenol conjugates.