Polyphenolic Compounds and Digestive Enzymes: In Vitro Non-Covalent Interactions

Area of Science:

• Biochemistry
• Pharmacology
• Food Science

Background:

• Digestive enzyme inhibition by polyphenolic compounds (PCs) is not fully understood.
• Previous studies often used extracts and UV-Vis spectroscopy, limiting detailed interaction analysis.
• Recent research employs pure PCs and advanced methods like calorimetry and circular dichroism.

Purpose of the Study:

• To review the structural characteristics of PCs responsible for digestive enzyme inhibition.
• To discuss advancements in methodologies used to study these interactions.
• To highlight structure-function relationships and differences in inhibitory effects.

Main Methods:

• Review of existing literature on polyphenol-enzyme interactions.
• Analysis of studies using techniques like isothermal titration calorimetry and circular dichroism.
• Focus on in vitro studies elucidating molecular interactions.

Main Results:

• PC structural features (molecular weight, substitution, glycosylation) correlate with inhibitory effects.
• Inhibition varies between carbohydrate-hydrolyzing enzymes (e.g., α-amylase) and proteases (e.g., trypsin).
• Non-covalent binding (van der Waals, hydrogen, hydrophobic, electrostatic forces) mediates interactions, typically causing non-competitive inhibition.

Conclusions:

• PC structure-function relationships are crucial for understanding digestive enzyme inhibition.
• Differences in PC structures likely explain varied in vivo effects.
• Further research is needed to fully elucidate these complex interactions.