Multifaceted Biological Activity of Rutin, Quercetin, and Quercetin's Glucosides

Area of Science:

• Biochemistry
• Pharmacology
• Natural Products Chemistry

Background:

• Flavonoids like rutin and quercetin possess diverse biological activities.
• Understanding their specific inhibitory effects against key enzymes and pathways is crucial for therapeutic applications.
• Quercetin glucosides are abundant in nature and their bioactivity warrants detailed investigation.

Purpose of the Study:

• To rank the multifaceted biological activities of rutin, quercetin, and its glucosides (Q3G, Q4'G, Q3,4'G).
• To evaluate their antioxidant potency, angiotensin-converting enzyme (ACE) and acetylcholinesterase (AChE) inhibitory activities, and advanced glycation endproduct (AGE) formation inhibition.
• To explore the relationship between their biological activities and antioxidant potential.

Main Methods:

• Electrochemical methods for antioxidant potency determination.
• Enzyme inhibition assays for ACE and AChE activity.
• Bovine serum albumin (BSA)/glucose and BSA/methylglyoxal (MGO) model systems for AGE formation.
• Cyclic voltammetry (CV) for antioxidant potential assessment.

Main Results:

• Quercetin exhibited the highest ACE inhibitory activity, while quercetin glucosides were most effective against AGE formation.
• Strong negative correlations were observed between antioxidant potential and ACE/AChE inhibition, and between anti-AGE activity and ACE/AChE inhibition.
• The chemical structure significantly impacts the biological activities of these compounds.

Conclusions:

• Rutin, quercetin, and its glucosides possess significant multifunctional activities relevant to hypertension, Alzheimer's disease, and diabetes.
• Antioxidant potential and chemical structure are key determinants of ACE and AChE inhibitory activities.
• These findings enhance understanding of plant-derived bioactive compounds and their therapeutic potential.