Table 2. Physico-chemical parameters.

Physico-chemical constant	Leaf	Stem bark
Foreign matter (% w/w)	0.20	0.85
Loss on drying (% w/w)	3.20	6.20
Total ash (% w/w)	6.00	11.2
Water soluble ash (% w/w)	2.20	1.80
Acid insoluble ash (% w/w)	1.40	0.80
Water soluble (% w/w)	18.40	14.8
Alcohol soluble (% w/w)	8.20	7.40
Swelling index (mL)	4.70	3.73