Table 2. Experimental data on brown color intensity, ginsenoside Rg₃ and benzopyrene of black ginseng under different conditions based on central composite design for response surface analysis.

Exp. No.	Brown color intensity (OD at 420 nm)	Ginsenoside Rg3 (mg/g)	Benzopyrene (μg/kg)
1	2.87631)	5.60	0.453
2	2.9773	4.57	0.427
3	3.1803	2.25	0.434
4	1.7170	2.07	0.349
5	3.3810	2.52	0.537
6	3.3333	2.49	0.506
7	1.9206	1.01	0.253
8	3.3070	5.56	0.255
9	1.5490	1.68	0.475
10	2.7960	2.72	0.524

Data were expressed as mean of triplicate determinations.