How is this Astragalus root oil extracted, and which method is preferred?
Astragalus root oil is produced by supercritical CO2 extraction (the mainstream premium route), traditional steam distillation, or the patented ethanol-soak + steam synergistic process.
Extraction Methods
| Method | Key parameters | Notes |
|---|---|---|
| Supercritical CO2 extraction (preferred) | 25–27 MPa, 50–52°C, 3–4 h | Astragaloside IV retention ≥92.3%; calycosin-7-O-glucoside isomerization loss only ≤1.2% (vs 7.8% for aqueous ethanol extraction); polysaccharide yield +67%; batch pass rate 98.8% |
| Steam distillation (traditional) | 50–6000 L stills, 0.3 MPa jacket | Lower yield, classical aroma profile |
| Patented synergistic route (CN117736806A) | Ethanol soak (40–60 mesh powder) + petroleum-ether ultrasonic (50–60 min, 20–25°C) + sc-CO2 (25–27 MPa, 50–52°C, 3–4 h) + steam extraction (6–10 h, bentonite + 15–18% NaCl brine) | Highest marker recovery for premium/lab grades |
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บทความนี้เผยแพร่เมื่อ 2026-09-07 และอัปเดตล่าสุดเมื่อ 2026-09-07 โดยจะมีการปรับปรุงเนื้อหาอย่างต่อเนื่อง
