Table 5.

Aristolochic acid concentration in Aristolochia spp. root diluted with 5. tetrandra root using acetonitrile–water as the extraction solvent (results by test sample weight)

Test sample weight, g	% Acetonitrile	Aristolochic acid concn, μg/g
0.25	25	646
	50	623
	60	604
	70	596
	80	619
	100	224
0.50	25	648
	50	621
	60	585
	70	595
	80	629
	100	195
1.00	25	625
	50	611
	60	605
	70	608
	80	593
	100	171
2.00	25	581
	50	613
	60	611
	70	610
	80	596
	100	164
3.00	25	534
	50	594
	60	601
	70	605
	80	569
	100	139