NIS - libdoc.who.int - World Health Organization

Radix Althaeae
Foreign organic matter
Not more than 2% of brown, deteriorated drug and not more than 2% of
cork in the peeled root (2).
Total ash
Not more than 6% in the peeled root and not more than 8% in the unpeeled
root (2).
Acid-insoluble ash
Not more than 3% in the peeled root (1).
Water-soluble extractive
Not less than 22% (1).
Loss on drying
Not more than 12% (2).
Swelling index
Not less than 10 (2).
Pesticide residues
The recommended maximum limit of aldrin and dieldrin is not more than
0.05 mg/kg (2). For other pesticides, see the European pharmacopoeia (2),
and the WHO guidelines on quality control methods for medicinal plants
(12) and pesticide residues (13).
Heavy metals
For maximum limits and analysis of heavy metals, consult the WHO
guidelines on quality control methods for medicinal plants (12).
Radioactive residues
Where applicable, consult the WHO guidelines on quality control methods
for medicinal plants (12) for the analysis of radioactive isotopes.
Other purity tests
Chemical, sulfated ash and alcohol-soluble extractive tests to be established
in accordance with national requirements.
Chemical assays
Not less than 10% total mucilage in the peeled root as determined by
gravimetric analysis (14).
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