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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This article was published on 2026-09-07, and last updated on 2026-09-07. The article will be continuously updated.
