Science
Mechanism of Action
This extract primarily acts as an antimicrobial by impairing bacterial cell membrane integrity, leading to cell lysis, and by disrupting microbial DNA replication and metabolism via components like alkaloids, saponins, and terpenoids. Its robust antioxidant capacity is attributed to efficient free radical scavenging and inhibition of superoxide anion generation. Anti-inflammatory effects are mediated by inhibiting crucial signaling pathways (calcium, AKT, and p38) within human neutrophils. The presence of phytochemicals such as flavonoids, saponins, tannins, and steroids further contributes to its antioxidant, anti-inflammatory, and traditional wound-healing attributes.
Research
Clinical Evidence
High confidenceOptimal antioxidant activity, showing 99.3% free radical scavenging, was observed at 0.1% (1000 µg/mL), surpassing BHT. Significant bactericidal effects against *Staphylococcus aureus* were noted at concentrations as low as 0.0078% (0.078 mg/mL).
Key findings
- 01 Exhibited significant bactericidal effect against *Staphylococcus aureus*, inhibiting biofilm formation by impairing cell membrane integrity and causing cell lysis.
- 02 Demonstrated remarkable antioxidant activity with 99.3% free radical scavenging ability, surpassing butylated hydroxytoluene (BHT) at the same concentration. IC50 value was 7.122 µg/mL.
- 03 A diterpenoid (16-hydroxycleroda-3,13(14)E-dien-15-oic acid) from *P. longifolia* significantly inhibited the generation of superoxide anion and the release of elastase in FMLP-activated human neutrophils, indicating anti-inflammatory and anti-oxidative activity.
- 04 Methanolic root extract showed maximum inhibition of edema (up to 40.5% at 5 hours) in carrageenin and serotonin-induced rat paw edema models.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Certain active compounds within the extract may be sensitive to chemical modifications; for instance, acetylation of a specific lactone from the stem extract reduced its antibacterial activity, suggesting careful formulation is required to maintain efficacy.
Safety
Safety Profile
The estimated LD50 in rats is above 5000 mg/kg, indicating a high margin of safety for acute exposure. While generally considered non-irritating for cosmetic use and rated low for irritancy by INCIDecoder, sub-chronic administration has been linked to dose-related changes in hematological and biochemical parameters. Potential for irritation, inflammation, or dryness may increase with less refined extracts or in combination with other problematic ingredients.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Polyalthia Longifolia Leaf Extract is a valuable, multifaceted ingredient for precision skincare, delivering significant antioxidant, antimicrobial, and anti-inflammatory benefits that cater to all skin types, enhancing overall skin health and resilience.
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References
Sources