Sinensetin (Polymethoxyflavone · Antiobesity · Anti-inflammatory)
| Compound | Sinensetin (3′,4′,5,6,7-Pentamethoxyflavone; Orthosiphon flavone A) |
| Chemical class | Polyphenol — Flavone (Polymethoxyflavone; fully methoxylated, no free hydroxyls) |
| CAS | 2306-27-6 |
| Primary source | Orthosiphon stamineus (Java Tea, Misai Kucing), Citrus sinensis (sweet orange) |
| Key applications | Anti-obesity; anti-inflammatory; antioxidant; diuretic support |
| Claim strength | Moderate |
| Typical form | Orthosiphon stamineus leaf extract standardised to sinensetin ≥0.2%; EMA traditional use registered herb |
| Buy from Herbuno | Availability on request — request bulk pricing → |
Name origin: Sinensetin is named after Citrus sinensis (sweet orange, sinensis = "Chinese"), reflecting its presence in Citrus peel — one of its commercially important sources. It is a fully methoxylated pentamethoxyflavone, carrying no free hydroxyl groups on the flavone ring system, which gives it very high lipophilicity and fundamentally different pharmacokinetics from polyphenols with multiple free hydroxyls. Traditional use: Orthosiphon stamineus (Java Tea or Misai Kucing — "cat's whiskers") has extensive traditional use across Southeast Asian medicine (Malaysian, Indonesian, Vietnamese) for urinary disorders, kidney stones, diabetes, hypertension, and rheumatism. Orthosiphon is one of the few traditional herbs with a European EMA traditional use registration for mild diuresis. Research trajectory: Sinensetin's fully methylated structure makes it both highly lipophilic and metabolically stable — resistant to phase II glucuronidation and sulphation that limit bioavailability of more hydroxylated flavones. Research has focused on anti-obesity (adipogenesis inhibition), anti-inflammatory, and antioxidant activities. Commercial source: Sinensetin-standardised Orthosiphon extract is not currently in the Herbuno catalogue at compound-specific level; availability on request.
Evidence for Sinensetin Applications
Anti-obesity and adipogenesis inhibition: Sinensetin inhibits adipocyte differentiation in 3T3-L1 preadipocyte models by suppressing C/EBPα, PPARγ, and SREBP-1c transcription factors at 10–50 μM. In high-fat diet rodent models, Orthosiphon extract (containing sinensetin as a primary constituent) reduces body weight gain, visceral fat accumulation, and plasma triglycerides. Claim strength: Moderate.
Anti-inflammatory: COX-2 and 5-LOX inhibition are documented. NF-κB pathway suppression at the IKKβ level reduces downstream pro-inflammatory cytokine production. Sinensetin's fully methoxylated structure gives it enhanced membrane penetration and intracellular anti-inflammatory activity versus polar flavones. Claim strength: Moderate.
Diuretic and renal: Orthosiphon stamineus preparations — in which sinensetin is a primary flavone — have EMA traditional use registration for mild diuresis, with small human studies demonstrating increased urine output and reduced UTI recurrence. Attribution to sinensetin specifically versus rosmarinic acid (another key Orthosiphon constituent) is not fully resolved. Claim strength: Moderate (extract); Emerging (sinensetin-isolated).
Antioxidant and neuroprotective: Despite lacking free hydroxyl groups, sinensetin demonstrates antioxidant activity via non-radical-scavenging mechanisms — enzyme induction (Nrf2/HO-1 pathway) and metal chelation through the carbonyl-oxygen system. Neuroprotective activity in glutamate and H₂O₂ models is documented. Claim strength: Emerging.
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Dosage & Formulator Specification
No isolated sinensetin human dosing data exist. Orthosiphon stamineus preparations studied in clinical contexts use 1.5–3.0 g/day dried leaf equivalent or 300–600 mg concentrated extract. Sinensetin content in Orthosiphon leaf extract is typically 0.1–0.5%; rosmarinic acid (at 1–5%) is the primary standardisation marker. For sinensetin-targeted formulations, a specification of ≥0.2% sinensetin by HPLC alongside ≥1% rosmarinic acid is achievable from high-quality Orthosiphon extracts.
The fully methoxylated structure of sinensetin eliminates the intestinal absorption bottleneck of hydroxylated flavones. Oral bioavailability is higher than most polyphenols (estimated F >30% versus <5% for quercetin aglycone). Stable across pH 2–9 and up to 120 °C for short exposure — excellent processing stability.
Orthosiphon extract is compatible with solid dosage (capsule, tablet), herbal tea (traditional format), and functional beverage applications. Widely available from Southeast Asian botanical suppliers with established agricultural supply chains from Malaysia, Indonesia, and Vietnam.
Orthosiphon preparations increase urine output — note fluid intake guidance for users and potential electrolyte considerations at high doses.
Frequently Asked Questions — Sinensetin
Why does sinensetin have no free hydroxyl groups?
Sinensetin is a pentamethoxyflavone — all five positions that would be free hydroxyl groups in apigenin plus one additional position (C-6) are methylated. Full methylation occurs via sequential methyltransferase activity in Citrus and Orthosiphon biosynthesis, producing a flavone with near-zero water solubility, high membrane permeability, and metabolic stability against conjugating enzymes.
What is the relationship between sinensetin and nobiletin/tangeretin?
Sinensetin (pentamethoxyflavone), nobiletin (hexamethoxyflavone), and tangeretin (pentamethoxyflavone, different methylation pattern) form a class of Citrus polymethoxyflavones with overlapping anti-obesity, anti-inflammatory, and neuroprotective activities. All concentrate in Citrus peel. Sinensetin differs from tangeretin in the C-5 position methylation pattern.
Is Orthosiphon (Java Tea) the best commercial source for sinensetin?
Yes — Orthosiphon stamineus/aristatus leaves are the richest conventional botanical source of sinensetin with established Southeast Asian supply chains. Citrus peel yields sinensetin as a minor constituent in a nobiletin/tangeretin-dominated mixture; Orthosiphon extract is more practical for sinensetin-targeted formulations.
Does sinensetin contribute to the diuretic activity of Java Tea?
Partially. Java Tea's diuretic activity is attributed to multiple constituents including rosmarinic acid, caffeic acid derivatives, and inorganic potassium. Sinensetin contributes anti-inflammatory activity at the renal tubule level. The EMA traditional use monograph covers the whole Orthosiphon leaf herb, not isolated sinensetin.
Related compounds: Eupatilin, Nobiletin, Tangeretin, Chrysin
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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