NIS - libdoc.who.int - World Health Organization

Flos Tiliae
ous flowers occur only occasionally (T. americana L., T. tomentosa Moench)
(2). Not more than 0.3% of organic matter. Not more than 2% of
inflorescences with bract or of bracts without inflorescences which have
been damaged by insects or harmed by erysiphe. Brownish and blackish
fragments of inflorescences, not more than 4%. Not more than 1% of other
parts of plant (leaves and branches). Not more than 2% of inflorescences
with fruits. For whole drug: not more than 3% of fragments of drug having
a diameter less than 3 mm; not more than 15% of fragments of drug spilled
from flowers or from inflorescences without bract. For cut drug: not more
than 10% of fragments of drug having a diameter less than 0.310 mm (1).
Total ash
Not more than 8% (2).
Acid-insoluble ash
Not more than 4% of ash insoluble in hydrochloric acid (3).
Sulfated ash
Not more than 10% (33).
Water-soluble extractive
Not less than 10% (36).
Alcohol-soluble extractive
No information available.
Loss on drying
Not more than 12% (2). Not more than 13% (1).
Swelling index
Not less than 15 (33).
Pesticide residues
The recommended maximum sum 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
plant materials (34) and pesticide residues (37).
Heavy metals
For maximum limits and analysis of heavy metals, consult the WHO
guidelines on quality control methods for medicinal plant materials (34).
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