How is this Sichuan pepper oil extracted, and which method is preferred?
Sichuan pepper oil is produced by steam distillation, supercritical CO2 extraction (SFE-CO2), or subcritical extraction, with molecular-distillation refinement and patented coupling processes for premium grades.
Extraction Methods
| Method | Parameters / Detail | Notes |
|---|---|---|
| Steam distillation | Classic hydro-distillation of dried pericarps (3–4 h reflux) | Traditional; yields a lighter aroma but very little numbing sanshool (CN103820202A limitation) |
| Supercritical CO2 extraction | Two-stage fractionation: 16–20 MPa / 40–45°C (step 1), 25–28 MPa / 50–55°C (step 2) | Recovery ≥ 97%, total sanshool amides ≥ 21.5% (CN201610891595); Shaanxi 72% of capacity uses SFE-CO2, oil yield 0.85%–0.91% |
| Subcritical + molecular distillation (CN111621365A) | Freeze-thaw pretreatment (-12 to -6°C, 6–8 min × 2–3) → steam distillation → subcritical extraction (35–55°C, 0.75–0.95 MPa) → molecular distillation (60–80°C, 40–80 mbar, wiper 60–300 r/min) + adsorbent | Best flavor retention; protects bioactive sanshools and essential-oil yield |
- SFE-CO2 preferentially recovers both the volatile aroma fraction and the lipid-soluble numbing sanshool amides, making it the preferred route for a complete ma-la profile
- Molecular-distillation refinement removes heavy resinous fractions for a cleaner, brighter top note
- GC-MS (volatiles) and HPLC (sanshool amides) dual analysis releases every batch
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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.
