Overview - ISO 22212:2025 for Gastrodia elata tuber
ISO 22212:2025 is the International Standard that defines minimum requirements and test methods for Gastrodia elata tuber used as Chinese materia medica. It applies specifically to tubers derived from cultivated and artificially propagated Gastrodia elata Bl., and explicitly excludes wild forms. The document covers quality, identification and safety parameters to support consistent clinical effectiveness and safe international trade.
Key topics and technical requirements
The standard specifies descriptive, compositional and analytical requirements, including:
- Morphology and physical characteristics: tuber size, shape, colour, texture and typical anatomical features (buds, latent buds, longitudinal wrinkles).
- Quality limits:
- Moisture: mass fraction ≤ 16.0%
- Total ash: mass fraction ≤ 6.0%
- Dilute ethanol‑soluble extract: mass fraction ≥ 14.0%
- Marker compounds: sum of gastrodin and p‑hydroxybenzyl alcohol ≥ 0.20%
- Identification: marker compounds (gastrodin, p‑hydroxybenzyl alcohol) identified by thin‑layer chromatography (TLC) showing specific spots/bands.
- Contaminants and residues:
- Determination of heavy metals (arsenic, mercury, lead, cadmium)
- Determination of pesticide residues (including Benzex, dichlorodiphenyltrichloroethane (DDT) and quintozene)
- Sulfur dioxide content
- Sampling and test methods:
- Sampling follows ISO 23723 (sample batch definitions, max batch size noted)
- Macroscopic identification requires random samples (≥ 500 g) for visual, smell and taste inspection
- Detailed test procedures and informative annexes (A–F) cover moisture, ethanol‑soluble extract, TLC identification and quantification of markers.
Practical applications and users
ISO 22212:2025 is intended for:
- Manufacturers and cultivators of Gastrodia elata tuber for quality control and product specification
- Analytical and contract laboratories performing routine testing (moisture, ash, marker assays, contaminants)
- Regulatory authorities, customs and standards bodies assessing safety and conformity for trade
- Pharmacopoeia committees and Traditional Chinese Medicine (TCM) product developers seeking harmonized test methods and acceptance criteria
- Traders, distributors and buyers who require verified quality for clinical use or manufacturing
Related standards
Normative references used for methods and limits include:
- ISO 23723 - general requirements for herbal raw material and materia medica
- ISO 18664 - heavy metals determination
- ISO 22258 - pesticide residues by GC
- ISO 22590 - sulfur dioxide determination
- ISO 21371 - labelling requirements
ISO 22212:2025 supports consistent, safe and traceable use of Gastrodia elata tuber across international markets and laboratory workflows.
