Scutellarein (Flavone · Neuroprotective · Antiviral)

Compound	Scutellarein
Chemical class	Polyphenol — Flavone (6-Hydroxyapigenin; Scutellarin aglycone)
CAS	529-53-3
Primary source	Scutellaria lateriflora (American skullcap), Scutellaria baicalensis (Chinese skullcap)
Key applications	Neuroprotective, antiviral, anti-inflammatory
Claim strength	Moderate
Typical form	Scutellarin hydrolysis product; skullcap extract constituent

Name origin: Directly from Scutellaria (skullcap genus), where scutellarein and its glucuronide scutellarin were identified as primary flavone constituents. Traditional use: Both American and Chinese skullcap species have well-documented traditional use — S. lateriflora as a nervine (anxiolytic, sleep support) in North American botanical medicine; S. baicalensis (Huang Qin) as an anti-inflammatory and antiviral herb in TCM. Scutellarein is a key bioactive alongside baicalein and wogonin. Research trajectory: Research into scutellarein has grown with interest in Scutellaria for neuroprotection, antiviral activity (including SARS-CoV-2 spike protein inhibition studies), and anti-inflammatory NF-κB suppression. Commercial source: Supplied as a constituent of Scutellaria extracts; scutellarein specifically is a hydrolysis product of scutellarin (the native glucuronide).

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Evidence for Scutellarein Applications

Neuroprotective activity: Scutellarein reduces neuroinflammation by suppressing microglial NF-κB activation and inhibiting NLRP3 inflammasome assembly. In ischemia-reperfusion animal models, it reduces infarct volume and improves neurological scores. Relevance to cognitive decline and ischemic stroke prevention is under investigation. Claim strength: Moderate.

Antiviral activity: Scutellarein demonstrates in vitro inhibitory activity against influenza neuraminidase, dengue virus, and in computational and early binding studies, SARS-CoV-2 spike protein interactions. The 6-hydroxy group is considered important for viral protein binding affinity. Clinical antiviral data are absent. Claim strength: Emerging.

Anti-inflammatory and antioxidant signalling: Like baicalein and wogonin (co-Scutellaria constituents), scutellarein suppresses COX-2, iNOS, and pro-inflammatory cytokines across macrophage and epithelial models. Strong antioxidant capacity; hydroxyl pattern at C-5, C-6, C-7, C-4′ contributes to high DPPH scavenging. Claim strength: Moderate.

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Dosage & Formulator Specification

No established human clinical dose for isolated scutellarein. Doses used in traditional Chinese medicine for Scutellaria baicalensis (Huang Qin) decoctions are 6–15 g of dried root, delivering a mixture of baicalin, baicalein, wogonin, and scutellarein. Commercial Scutellaria extract supplements typically provide 250–500 mg/day of an extract standardised to 30–85% total flavones (primarily as baicalin).

For scutellarein-specific applications, request Scutellaria baicalensis extract with HPLC quantification of scutellarein alongside baicalin, baicalein, and wogonin. Scutellarein content in commercial baicalin-standardised extracts varies widely (1–8% of total flavone content).

Scutellarein has low aqueous solubility; glycoside form (scutellarin) improves water dispersibility. For liquid formulations, specify scutellarin (glucuronide) form. Stability is good at neutral pH; avoid prolonged exposure to strong alkaline conditions.

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Frequently Asked Questions — Scutellarein

What is the relationship between scutellarein and scutellarin?
Scutellarin is the glucuronide (7-O-glucuronide) of scutellarein — the native form in the plant. Enzymatic or acid hydrolysis removes the glucuronate to yield the aglycone scutellarein. The aglycone has different solubility, bioavailability, and pharmacokinetic profiles compared to the glycoside.

How does scutellarein differ from baicalein?
Scutellarein has an additional hydroxyl at C-6 compared to baicalein. This structural difference influences antioxidant capacity (higher in scutellarein) and enzyme binding profiles. Both are co-present in Scutellaria baicalensis and contribute to its overall bioactivity.

Is Scutellaria lateriflora (American skullcap) adulteration a quality concern?
Yes. American skullcap has historically been adulterated with germander (Teucrium species), which contains hepatotoxic neo-clerodane diterpenes. Formulators should require botanical identity verification (DNA barcoding or HPLC marker profiling) for American skullcap materials.

Can scutellarein be co-formulated with baicalein and wogonin?
Yes. The three flavones share complementary and potentially synergistic anti-inflammatory mechanisms. A standardised Scutellaria baicalensis extract naturally co-delivers all three at characteristic ratios, which simplifies formulation while providing the full botanical phytochemical profile.

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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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