Table 7.

Aristolochic acid concentration in Aristolochia spp. root diluted with S. tetrandra root using acetonitrile-water as the extraction solvent (results by percent acetonitrile)

% Acetonitrile	Test sample weight, g	Aristolochic acid concn, μg/g
25	0.24690	646
	0.50260	648
	1.0224	625
	1.9969	581
	3.0289	534
50	0.25730	623
	0.51120	621
	1.0871	611
	2.0253	613
	3.0004	594
60	0.25350	604
	0.50390	585
	1.0615	605
	2.0270	611
	3.0651	601
70	0.25060	596
	0.25760	595
	1.0692	608
	2.0106	610
	2.9987	605
80	0.25850	619
	0.50500	629
	1.0219	593
	2.0515	596
	2.9842	569
100	0.2504	224
	0.5107	195
	0.9947	171
	2.0486	164
	3.0359	139