Table 3. Predicted level of the optimum extraction conditions for yields, acidic polysaccharides and ginsenosides of red and black ginseng by the ridge analysis of their response surfaces

Responses		Extraction conditions						Morphology
		Ethanol conc. (%)		Temperature (°C)		Estimated response
		Maximum	Minimum	Maximum	Minimum	Maximum	Minimum
Yields (%)1)	Red ginseng	1.52	79.75	67.27	68.88	5.29	3.07	Saddle point
	Black ginseng	3.12	70.52	66.13	63.54	6.11	2.07	Saddle point
Acidic polysaccharides (mg/mL)	Red ginseng	4.03	76.32	69.61	65.81	1.86	1.44	Maximum point
	Black ginseng	24.67	48.86	71.14	60.25	1.80	1.46	Maximum point
Red ginseng ginsenosides (mg/mL)	Rg1	79.92	1.11	70.62	67.67	0.22	0.15	Saddle point
	Rb1	79.94	0.50	69.46	68.42	0.36	0.17	Saddle point
Black ginseng ginsenosides (mg/mL)	Rb1	75.11	2.63	65.21	66.43	0.28	0.17	Saddle point
	Rg3	75.70	2.74	65.49	66.35	0.31	0.12	Saddle point

The yields of the extracts obtained by adding 20 g of red and black ginseng to 200 mL of solvent.