Overview
ISO 21316:2019 - Traditional Chinese medicine - Isatis indigotica root establishes international minimum requirements and test methods for dried root of Isatis indigotica Fort. It applies to whole medicinal materials (Chinese materia medica) and decoction pieces. The standard defines morphological description, chemical and physical quality limits, identification procedures and sampling/testing protocols to support safety, consistency and international trade of Isatis indigotica root used in TCM.
Key Topics and Technical Requirements
- Morphology and organoleptics
- Appearance: cylindrical, slightly twisted, longitudinal wrinkles, lenticels and rootlet scars.
- Colour: pale grayish-yellow to brownish-yellow.
- Dimensions: length typically 10–20 cm; diameter 0.5–2.0 cm (measured near base).
- Texture, fracture and odour/taste descriptors provided for macroscopic ID.
- Quantitative limits
- Moisture ≤ 15.0%
- Total ash ≤ 9.0%
- Acid‑insoluble ash ≤ 2.0%
- Ethanol‑soluble extractives ≥ 25.0%
- Chemical markers and identification
- Marker compound: (R,S)-goitrin selected for specificity to Brassicaceae-derived Isatis.
- Identification by thin‑layer chromatography (TLC) and quantification by HPLC as described.
- Contaminants and residues
- Determination of heavy metals (arsenic, mercury, lead, cadmium).
- Pesticide residue testing (examples: Benzex, DDT, quintozene) per CODEX and national MRLs.
- Sampling and test methods
- Sampling follows WHO “Quality control methods for herbal materials” guidance with pooled and quartered samples.
- Test methods include moisture, total ash, acid‑insoluble ash, ethanol extractives, TLC identification, HPLC marker assay, heavy metals and pesticide analyses.
- Quality assurance
- Requirements for test reporting, packaging, storage, transportation, marking and labelling.
Applications and Who Uses It
- Herbal product manufacturers - implement standardized quality control for raw Isatis indigotica root and decoction pieces.
- Analytical laboratories - perform TLC/HPLC, ash, moisture and contaminant testing aligned with ISO 21316:2019 methods.
- Regulators and customs authorities - adopt consistent acceptance criteria for imports/exports and public health protection.
- Distributors, exporters and purchasers - verify supplier compliance to reduce adulteration (e.g., Baphicacanthis substitution) and ensure consistent clinical efficacy.
- TCM practitioners and formulators - ensure herbal materials meet recognized quality specifications.
Related Standards
- ISO 1575, ISO 1577 (ash testing for tea)
- ISO 18664 (heavy metals in TCM herbs)
- ISO 21371 (labelling for TCM products)
- Codex/CODEX and WHO guidance for pesticide and sampling methods
ISO 21316:2019 supports harmonized quality, safety and traceability of Isatis indigotica root in international trade and clinical use of traditional Chinese medicine.