Is a Certificate of Analysis (COA) provided for every batch of zedoary turmeric oil?
Yes, every batch of zedoary turmeric oil is released with a full Certificate of Analysis (COA). The pharmacopoeia-grade COA covers the complete ChP 2025 monograph test set: appearance, density, refractive index, optical rotation, TLC identification, HPLC fingerprint similarity, germacrone and furanodiene content, heavy metals and arsenic.
COA Content
| Parameter | Pharmacopoeia limit | Method |
|---|---|---|
| Appearance | Clear liquid, light to dark brown | Visual |
| Relative density | 0.970-0.990 | ChP 0601 |
| Refractive index | 1.500-1.510 | ChP 0622 |
| Optical rotation | +20 to +25 | ChP 0621 |
| TLC identification | Curcumol, germacrone, curdione present | ChP 0502 |
| Fingerprint similarity | ≥0.95 | ChP 0512 (HPLC, 216 nm) |
| Germacrone | ≥7.5% | HPLC |
| Furanodiene | ≥10.0% | HPLC |
| Heavy metals | ≤10 mg/kg | ChP 0821 |
| Arsenic | ≤2 mg/kg | ChP 0822 |
COA Notes
- Fragrance-grade batches are released against the enterprise specification with the wider density/RI ranges; the same actives are still quantified
- COA includes batch number, production date, quantity, packaging and the standards executed
- An HPLC fingerprint chart and, on request, a GC-MS profile are attached to the COA
- COAs are issued in English or Chinese, and a signed hard copy follows the goods with the shipping documents
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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.
