NIS - libdoc.who.int - World Health Organization

WHO monographs on medicinal plants commonly used in the Newly Independent States (NIS)
Foreign organic matter
Not more than 3% stems with a diameter greater than 5 mm (1) and not
more than 2% other foreign matter (1, 3).
Total ash
Not more than 7% (1).
Acid-insoluble ash
Not more than 2.5% (9).
Sulfated ash
Not more than 2.5% (9).
Water-soluble extractive
Not less than 12% (9).
Loss on drying
Not more than 10% (1, 3).
Pesticide residues
The recommended maximum limit of aldrin and dieldrin is not more than
0.05 mg/kg (14). For other pesticides, see the European pharmacopoeia
(14), and the WHO guidelines on quality control methods for medicinal
plants (13) and pesticide residues (15).
Heavy metals
For maximum limits and analysis of heavy metals, consult the WHO
guidelines on quality control methods for medicinal plants (13).
Radioactive residues
Where applicable, consult the WHO guidelines on quality control methods
for medicinal plants (13) for the analysis of radioactive isotopes.
Other purity tests
Chemical and alcohol-soluble extractive tests to be established in accordance
with national requirements.
Chemical assays
Contains not less than 0.08% hypericins calculated as hypericin, as determined
by spectrophotometry (1). Quantitation can also be obtained by
high-performance liquid chromatography (2, 16).
204