Phytochemical Properties and Biological Activities of Viola Species

Species of the genus Viola possess a rich and varied phytochemical profile, characterised by polyphenols such as flavonoids, phenolic acids, lignans, coumarins and anthocyanins, together with saponins and alkaloids. Flowers, leaves and roots yield distinct chemotypes with tissue-specific accumulation of bioactive constituents. These compounds underlie a broad spectrum of biological activities, including antioxidant and antimicrobial effects, anti-inflammatory and analgesic actions, hepatoprotective and cardiometabolic benefits, as well as neuromodulatory and antidepressant properties. Mechanistic studies have revealed modulation of oxidative stress pathways, inhibition of calcium influx via membrane channels, nitric oxide-mediated vasorelaxation and suppression of pro-inflammatory signalling cascades. Ethnopharmacological traditions across Europe, Asia and the Americas attest to the use of Viola species in treating respiratory, dermatological, cardiovascular and neurological ailments. Recent efforts in metabolomic profiling and chemotype selection aim to optimise agronomic cultivation for nutraceutical and cosmeceutical applications. While preclinical findings are encouraging, standardisation of extracts and rigorous clinical evaluation remain priorities for translating botanical potential into evidence-based therapies.

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Phytochemical Properties and Biological Activities of Viola Species publication trend

The graph below shows the total number of articles in phytochemical properties and biological activities of viola species across all publications each year (not limited to Nature Index journals).

Technical terms

Polyphenols: Plant secondary metabolites characterised by multiple phenolic rings, often responsible for antioxidant activity.

Flavonoids: A subclass of polyphenols containing a 15-carbon skeleton, widely distributed in flowers and leaves and noted for diverse bioactivities.

Phenolic acids: Simple aromatic acids derived from the phenylpropanoid pathway, contributing to antimicrobial and antioxidant effects.

Antioxidant activity: The ability of a compound to scavenge free radicals or inhibit oxidative damage to biomolecules.

Antimicrobial activity: The capacity to inhibit or kill bacteria, fungi or other microorganisms.

Vasorelaxation: Relaxation of vascular smooth muscle, often mediated by nitric oxide or calcium-channel modulation, leading to reduced blood pressure.

Nitric oxide (NO): A gaseous signalling molecule that induces smooth muscle relaxation and modulates inflammatory responses.

References

1. Polyphenolic Profiling, Antioxidant, and Antimicrobial Activities Revealed the Quality and Adaptive Behavior of Viola Species, a Dietary Spice in the Himalayas. Molecules (2022).
2. Studies on the antihypertensive and antidyslipidemic activities of Viola odorata leaves extract. Lipids in Health and Disease (2012).
3. Anti-inflammatory effects of Viola yedoensis and the application of cell extraction methods for investigating bioactive constituents in macrophages. BMC Complementary Medicine and Therapies (2016).