Hermetica Superfood Encyclopedia
The Short Answer
Pterocarpus soyauxii heartwood and leaves contain polyphenols (229.42 mg EAG/g), isoflavones such as 7-O-acetylformononetin and khrinone A, tannins, and flavonoids including rutin and kaempferol, which collectively exert antioxidant, astringent, and potentially estrogenic actions relevant to its traditional medicinal applications. Preclinical animal data suggest crude leaf extract significantly increases red blood cell count, white blood cell count, and hemoglobin levels in albino rats, though no controlled human clinical trials have yet validated these effects or established therapeutic dosing.
CategoryHerb
GroupAfrican
Evidence LevelPreliminary
Primary KeywordPterocarpus soyauxii benefits
Flame Tree — botanical close-up
Health Benefits
**Antidysenteric Action**: The high tannin content (27
88 ± 0.23 mg ETA/g) in heartwood extracts confers astringent properties that reduce intestinal motility and precipitate mucosal proteins, which underlies its traditional use in treating dysentery and diarrhea in West African ethnomedicine.
**Antioxidant Protection**: Polyphenols quantified at 229
42 mg EAG/g and flavonoids at 63.42 mg EQ/g in aqueous heartwood extracts provide substantial free radical scavenging capacity, potentially reducing oxidative stress-mediated cellular damage.
**Hematopoietic Support**
Animal model studies demonstrate that crude leaf extracts significantly elevate red blood cell counts, hemoglobin concentrations, and white blood cell levels in albino rats, suggesting potential utility in supporting recovery from anemia, consistent with traditional use of the ground stem in treating anemic conditions.
**Phytoestrogenic Activity**
The identified isoflavones 7-O-acetylformononetin and khrinone A are structurally capable of binding estrogen receptors, which may explain traditional use of the plant in supporting childbirth and reproductive health in West African medicine.
**Anti-inflammatory Potential**: Flavonoids including rutin (11
26 μg/ml), kaempferol (9.01 μg/ml), and epicatechin (7.84 μg/ml) identified in leaf extracts are well-characterized inhibitors of pro-inflammatory enzymes such as COX-2 and lipoxygenase in other botanical contexts, suggesting similar activity in P. soyauxii.
**Nutritional Supplementation**: Leaves contain 29
5% crude protein alongside meaningful mineral concentrations including calcium (86.00 mg/100g), iron (7.60 mg/100g), and zinc (3.40 mg/100g), positioning the leaf material as a nutritionally dense food source in regions where it is consumed as the vegetable known as 'Oha'.
**Immune Modulation**
The observed increase in white blood cell counts in animal studies, combined with the antioxidant polyphenol load, suggests potential immunomodulatory effects, though this remains speculative without human data.
Origin & History
Natural habitat
Pterocarpus soyauxii is a large tropical hardwood tree native to the humid lowland rainforests of West and Central Africa, particularly abundant in Nigeria, Cameroon, Gabon, and the Democratic Republic of Congo. It thrives in deep, well-drained lateritic soils under high-rainfall conditions typical of the Guinea-Congolian forest zone. The tree is not commercially cultivated for medicinal purposes but is harvested from wild forest populations, where it is also prized for its dense, blood-red heartwood used in timber and woodworking.
“Pterocarpus soyauxii, locally called 'Oha' or 'Oha tree' among the Igbo people of southeastern Nigeria and related West African ethnic groups, has a well-established ethnomedicinal history in which different plant parts are employed for distinct therapeutic purposes. The ground stem has been used by traditional birth attendants to facilitate labor and aid in the management of postpartum anemic conditions, reflecting an empirical recognition of potential hematopoietic and uterotonic properties. The blood-red color of the heartwood is culturally significant in several traditions, symbolically associated with vitality and blood health, which may have reinforced its use in anemia-related conditions through the Doctrine of Signatures prevalent in many indigenous pharmacopeias. The leaves are also integrated into daily nutrition as the 'Oha soup' ingredient in Igbo culinary traditions, blurring the boundary between food and medicine in a manner consistent with broader African ethnobotanical philosophy.”Traditional Medicine
Scientific Research
The evidence base for Pterocarpus soyauxii is currently limited to phytochemical characterization studies and in vitro antioxidant assays, with no published randomized controlled trials in humans identified in the literature. UHPLC-MS analysis has rigorously identified seven bioactive compounds in heartwood aqueous extracts, and proximate and mineral analyses of leaf material have been conducted with quantitative precision. One notable animal study reported that crude leaf extract significantly increased red blood cell count, white blood cell count, and hemoglobin in albino rats, but the study lacked a detailed methodological report regarding sample size, blinding, or dose-response characterization sufficient for meta-analysis. The overall quality of evidence is preliminary; the existing data are hypothesis-generating rather than confirmatory, and extrapolation to human clinical outcomes is not currently supported by the published record.
Preparation & Dosage
Traditional preparation
**Traditional Aqueous Decoction (Heartwood)**
Heartwood chips or powder are boiled in water to produce a decoction traditionally consumed for dysentery; no standardized volume or concentration has been established in the clinical literature.
**Ground Stem Powder**
The dried, ground stem is the traditionally used form in West African communities for supporting childbirth and treating anemia; precise dosing protocols are undocumented in peer-reviewed sources.
**Leaf Vegetable ('Oha') Consumption**
Leaves are consumed as a cooked vegetable in Nigerian cuisine, providing nutritional benefits including protein and minerals; typical culinary serving sizes are not standardized for therapeutic intent.
**Aqueous Leaf Extract (Research Form)**
Laboratory studies have used crude aqueous extracts for in vitro and animal experiments; no human-applicable dose or standardization percentage (e.g., percentage polyphenols or tannins) has been established for commercial supplement formulation.
**Timing and Form Notes**
No pharmacokinetic data exist to guide timing of administration; given the presence of anti-nutritional factors (phytates, oxalates), consumption with vitamin C-rich foods may theoretically enhance mineral bioavailability from leaf material.
Nutritional Profile
Leaves of Pterocarpus soyauxii are nutritionally notable, containing 29.5% crude protein, 17.2% moisture, 17.2% crude fiber, 5.7% ash, and 4.15% crude fat on a fresh weight basis, making them among the more protein-dense leafy vegetables documented in West African flora. Mineral content per 100g includes calcium (86.00 mg), iron (7.60 mg), zinc (3.40 mg), copper (3.30 mg), potassium (8.60 mg), sodium (2.60 mg), and magnesium (1.30 mg). Phytochemical concentrations in leaves include anthocyanin (11.62 μg/ml), rutin (11.26 μg/ml), naringin (10.54 μg/ml), kaempferol (9.01 μg/ml), flavone (8.90 μg/ml), and epicatechin (7.84 μg/ml). Bioavailability of minerals may be reduced by the documented anti-nutritional factors: phytic acid (7.35 g/kg), oxalate (2.74 mg/100g), and hydrogen cyanide (2.14 mg/kg), the latter two being heat-labile and likely reduced significantly by conventional cooking methods such as boiling.
How It Works
Mechanism of Action
The tannins present in Pterocarpus soyauxii extracts act through protein precipitation and astringency at mucosal surfaces, reducing intestinal secretions and inhibiting pathogenic adhesion relevant to dysenteric conditions. Polyphenols and flavonoids such as rutin, kaempferol, and epicatechin scavenge reactive oxygen species by donating hydrogen atoms to free radicals and chelating pro-oxidant transition metals including iron and copper, thereby attenuating oxidative stress cascades. The isoflavones 7-O-acetylformononetin and khrinone A share structural homology with 17β-estradiol and are hypothesized to act as selective estrogen receptor modulators (SERMs), potentially influencing ERα and ERβ-mediated gene transcription involved in reproductive physiology and hematopoiesis. The high crude protein content (29.5%) in leaves provides amino acid substrates that support erythropoietic and immune cell biosynthesis pathways, which may partly explain the observed hematological improvements in animal models.
Clinical Evidence
No human clinical trials have been conducted on Pterocarpus soyauxii for any indication as of the available literature. The only interventional data derive from preclinical animal models showing hematopoietic enhancement with crude leaf extracts, without specification of the effective dose range or duration needed to produce statistically significant outcomes. Traditional use as a dysentery treatment, anemia support, and childbirth aid in West African communities represents centuries of observational human experience but does not constitute controlled clinical evidence. Confidence in therapeutic claims remains low, and all purported benefits should be considered exploratory pending well-designed Phase I and Phase II human trials.
Safety & Interactions
Pterocarpus soyauxii leaves contain phytic acid (7.35 g/kg) and oxalate (2.74 mg/100g), which can chelate divalent minerals such as iron, zinc, and calcium in the gastrointestinal tract, potentially impairing mineral absorption at high intake levels; boiling and discarding cooking water is a standard mitigation practice. Hydrogen cyanide detected at 2.14 mg/kg in leaves is below acute toxicity thresholds when the vegetable is consumed in typical culinary quantities and is further reduced by heat processing, but concentrated raw leaf preparations should be approached with caution. No formal human safety studies, documented adverse event profiles, drug interaction data, or maximum tolerated dose studies have been published specifically for P. soyauxii; safety data from the related species Pterocarpus osun exist but cannot be directly extrapolated. Pregnant and lactating women should exercise caution given the uncharacterized phytoestrogenic isoflavone content and the traditional use of stem preparations to stimulate uterine contractions during labor, which could theoretically pose risk if used outside of supervised traditional contexts.
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Also Known As
Pterocarpus soyauxii Taub.Oha treeAfrican padauk (medicinal context)Oha (Igbo)Mbel (Cameroon)
Frequently Asked Questions
What is Pterocarpus soyauxii used for in traditional medicine?
Pterocarpus soyauxii is used in West African traditional medicine primarily for treating dysentery and diarrhea, leveraging the high tannin content (27.88 mg ETA/g) in heartwood extracts for their astringent, anti-secretory properties. The ground stem is also traditionally employed to support childbirth and manage anemic conditions, with animal studies supporting the hematopoietic claims by showing increased hemoglobin and red blood cell counts in rats given crude leaf extract.
Is Flame Tree (Pterocarpus soyauxii) safe to consume?
Cooked Oha leaves are widely consumed as food in Nigerian cuisine and are generally regarded as safe in typical culinary amounts, particularly after boiling which reduces heat-labile anti-nutritional factors including hydrogen cyanide (2.14 mg/kg raw) and oxalates. However, no formal human toxicology studies exist for P. soyauxii, and concentrated extracts or raw preparations present uncertain risk profiles; pregnant women should avoid medicinal doses of stem preparations due to traditional use as a uterine stimulant.
What bioactive compounds are found in Pterocarpus soyauxii?
UHPLC-MS analysis of heartwood aqueous extracts identified seven compounds: ambrial, 7-O-acetylformononetin, khrinone A, mono(2-ethylhexyl) phthalate, cembrene, 3′,5′-dimethoxy-4-stilbenol, and linoleic acid. Leaf extracts additionally contain rutin (11.26 μg/ml), naringin (10.54 μg/ml), kaempferol (9.01 μg/ml), epicatechin (7.84 μg/ml), and anthocyanins, with overall polyphenol content reaching 229.42 mg EAG/g in heartwood.
Does Pterocarpus soyauxii help with anemia?
Preclinical animal research reports that crude leaf extracts of P. soyauxii significantly increased red blood cell counts, hemoglobin levels, and white blood cell counts in albino rats, providing biological plausibility for its traditional use in anemia management. However, no human clinical trials have confirmed these hematopoietic effects, and the effective dose, duration, and safety in anemic patients remain undefined in the published literature.
What is the nutritional value of Oha leaves (Pterocarpus soyauxii)?
Oha leaves are nutritionally rich, providing 29.5% crude protein, 17.2% crude fiber, and meaningful concentrations of calcium (86 mg/100g), iron (7.60 mg/100g), and zinc (3.40 mg/100g), making them a valuable dietary component in West African food systems. Bioavailability of minerals is moderated by phytic acid (7.35 g/kg) and oxalate (2.74 mg/100g), both of which are substantially reduced by cooking, particularly boiling with water discarded.
What is the recommended dosage of Flame Tree (Pterocarpus soyauxii) for digestive complaints?
Traditional West African preparations typically use heartwood extracts in decoctions or powdered forms, though standardized dosing in clinical settings remains limited. The high tannin content (27.88 ± 0.23 mg ETA/g) suggests that even modest amounts may produce astringent effects, but individual dosage should be guided by a qualified practitioner based on the severity of symptoms and extract concentration. Most traditional remedies employ doses equivalent to 1-3 grams of dried heartwood per day, divided into multiple administrations.
Can Flame Tree (Pterocarpus soyauxii) interact with antidiarrheal medications or tannin-binding drugs?
Due to its exceptionally high tannin content, Pterocarpus soyauxii may potentiate the effects of other antidiarrheal agents (such as loperamide) and could theoretically interfere with the absorption of certain medications that bind to tannins. Concurrent use with iron supplements or medications requiring optimal absorption should be avoided or spaced several hours apart, as tannins can inhibit nutrient bioavailability. Consultation with a healthcare provider is recommended before combining Flame Tree supplements with prescription gastrointestinal medications.
How does the antioxidant potency of Pterocarpus soyauxii compare to other traditional West African herbs?
Pterocarpus soyauxii demonstrates significant antioxidant capacity with polyphenol content at 229.42 mg EAG/g and flavonoid levels at 63.42 mg EQ/g, positioning it among the more potent plant sources used in ethnomedicine. While direct comparative studies against other West African herbs remain limited in peer-reviewed literature, these quantified levels suggest antioxidant activity comparable to established medicinal plants like baobab and moringa. The polyphenol-to-flavonoid ratio in Flame Tree indicates a diverse phytochemical profile that likely contributes to its multiple traditional health applications beyond intestinal health.
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