Purslane Extract (Portulaca oleracea)

Purslane extract contains omega-3 fatty acids, betalains, and phenolic compounds that demonstrate potent anti-inflammatory activity through inhibition of inflammatory mediators. Research shows purslane oil and extract fractions achieved 44-99% inflammation inhibition in laboratory assays at doses of 15-150 μg.

Origin & History

Purslane extract derives from Portulaca oleracea L., a succulent annual plant known locally as 'olasiman,' native to regions including the Philippines and widely cultivated for its edible leaves and stems. The extract is produced using hydroethanolic extraction (80:20 ethanol/water) or oil extraction methods, yielding bioactive compounds including omega-3 fatty acids, flavonoids, alkaloids, and phenolic compounds.

Historical & Cultural Context

Purslane (Portulaca oleracea) has historical use as both an edible leafy vegetable and medicinal plant, though specific traditional systems or durations of use are not detailed in available research. The plant is noted in WHO databases for bioactivity investigation and is compared nutritionally to common vegetables like cabbage and lettuce.

Health Benefits

• Anti-inflammatory effects: Oil and extract fractions demonstrated 44-99% inhibition of inflammation in chorioallantoic membrane assays at 15-150 μg doses (in vitro evidence only)
• Antioxidant activity: Hydroalcoholic extracts showed radical scavenging with IC50 of 52.86 μg/mL in DPPH/ABTS assays (in vitro evidence only)
• Rich omega-3 source: Contains α-linolenic acid at 35.4-54.92% in leaves and DHA at 5.08% (compositional analysis only)
• Non-hepatotoxic profile: Demonstrated no liver toxicity in cytotoxicity assays with GI50 >400 μg/mL (in vitro evidence only)
• Nutritional density: High in minerals including calcium and potassium, comparable to cabbage/lettuce (compositional analysis only)

How It Works

Purslane extract's anti-inflammatory effects stem from its high omega-3 fatty acid content, particularly alpha-linolenic acid, which modulates prostaglandin and leukotriene synthesis pathways. The betalain pigments and phenolic compounds act as potent antioxidants, scavenging free radicals and reducing oxidative stress markers. These bioactive compounds work synergistically to inhibit pro-inflammatory cytokine production and cyclooxygenase enzyme activity.

Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses on purslane extract were identified in the research dossier. Current evidence is limited to in vitro studies including chorioallantoic membrane assays for anti-inflammatory effects and antioxidant assays, without any PubMed PMIDs provided for human studies.

Clinical Summary

Current evidence for purslane extract comes primarily from in vitro studies using chorioallantoic membrane assays, where oil and extract fractions demonstrated 44-99% inhibition of inflammation at 15-150 μg doses. Antioxidant studies show hydroalcoholic extracts achieved DPPH radical scavenging with IC50 values of 52.86 μg/mL. No human clinical trials have been conducted to date, limiting evidence to laboratory-based research. The promising in vitro results warrant further investigation through animal and human studies.

Nutritional Profile

Purslane (Portulaca oleracea) is notably nutrient-dense for a leafy plant. **Macronutrients (per 100g fresh weight):** Water ~93%, protein 1.3–2.0g, fat 0.1–0.4g (exceptionally rich in omega-3 fatty acids for a plant), carbohydrates 3.4–3.8g, dietary fiber 0.5–0.9g. Energy: ~16–20 kcal. **Omega-3 Fatty Acids:** α-Linolenic acid (ALA) constitutes 35.4–54.9% of total fatty acids in leaves, yielding approximately 300–400 mg ALA per 100g fresh weight — one of the highest concentrations among edible plants. Bioavailability of plant-derived ALA is moderate; conversion to EPA/DHA is limited (~5–10% to EPA, <1% to DHA in humans). **Vitamins:** Vitamin A (β-carotene): 1320–2550 μg/100g fresh weight (high bioavailability when consumed with fat); Vitamin C: 12–21 mg/100g; Vitamin E (α-tocopherol): 3.0–12.2 mg/100g; B-vitamins including riboflavin (0.11 mg), niacin (0.48 mg), pyridoxine (0.07 mg) per 100g. **Minerals:** Potassium: 494–560 mg/100g; Magnesium: 68–87 mg/100g; Calcium: 65–103 mg/100g; Phosphorus: 40–56 mg/100g; Iron: 1.99–2.5 mg/100g (non-heme, ~5–12% bioavailability, enhanced by co-consumed vitamin C); Zinc: 0.17–0.37 mg/100g; Manganese: 0.30–0.48 mg/100g. **Key Bioactive Compounds:** Betalain pigments (betacyanins 2.3–14.8 mg/100g, betaxanthins 2.0–10.5 mg/100g — responsible for red/yellow pigmentation and antioxidant activity); total phenolics: 40–120 mg GAE/100g fresh weight; flavonoids including kaempferol, quercetin, apigenin, luteolin and their glycosides (combined ~5–30 mg/100g depending on cultivar and growing conditions); homoisoflavonoids and coumarins in trace amounts. **Oxalate content:** Notable concern — total oxalates range from 670–1679 mg/100g fresh weight (predominantly soluble oxalates ~50–80%), which can reduce calcium and iron bioavailability and may pose risk for kidney stone–prone individuals. Cooking/blanching reduces soluble oxalate by 30–50%. **Polysaccharides:** Mucilaginous polysaccharides (galacturonic acid-rich pectic polysaccharides) at approximately 1.5–3.5% dry weight, contributing to potential prebiotic and gastroprotective effects. **Melatonin:** Purslane contains unusually high melatonin concentrations for a plant, reported at 10–20 ng/g fresh weight. **Glutathione:** Reported at approximately 14.81 mg/100g fresh weight. **Carotenoids beyond β-carotene:** Lutein (~1.5–2.5 mg/100g), zeaxanthin, and neoxanthin are present in meaningful quantities. Overall, purslane extract concentrates these bioactives; standardized extracts typically specify phenolic content (often 5–20% polyphenols by weight in dried extract), ALA content, and/or betalain levels depending on extraction solvent (hydroalcoholic extracts favor phenolics and betalains; lipophilic extracts concentrate ALA and tocopherols).

Preparation & Dosage

No clinically studied dosage ranges for purslane extract have been established in human trials. In vitro studies used 15-150 μg for anti-inflammatory effects and 1g dried sample in 30mL solvent for extractions. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Omega-3 fatty acids, Quercetin, Turmeric extract, Green tea extract, Vitamin E

Safety & Interactions

Purslane extract is generally recognized as safe when consumed as a food, as purslane is commonly eaten as a vegetable worldwide. However, no formal safety studies exist for concentrated purslane extracts or supplements. Individuals taking blood-thinning medications should exercise caution due to the high omega-3 content, which may enhance anticoagulant effects. Pregnant and breastfeeding women should avoid purslane supplements, as traditional use suggests potential uterine stimulant properties.