Table 2. Polynomial equations and F-value calculated by response surface methodology for yields, acidic polysaccharides and ginsenosides of red and black ginseng

Responses		Polynomial equations1)	R2 2)	Significance	F-value
					Ethanol conc.	Temperature
Yields	Red ginseng	Y1 = 12.975714 − 0.059381X1 − 0.197333X2 − 0.000034821X1X1 + 0.0005X1X2 + 0.001243X2X2	0.9679	0.0044	39.76***	0.33
	Black ginseng	Y2 = 9.15381 − 0.341726X1 + 0.027667X2 + 0.000108X1X1 + 0.00425X1X2 − 0.001071X2X2	0.8545	0.0795	7.07**	1.47
Acidic polysaccharides	Red ginseng	Y3 = −6.11 − 0.006333X1 + 0.229333X2 − 0.000071875X1X1 + 0.0001X1X2 − 0.00165X2X2	0.9251	0.0227	14.58**	3.19
	Black ginseng	Y4 = −12.156905 + 0.012071X1 + 0388333X2 − 0.0000946431X1X1 − 0.0001X1X2 − 0.002714X2X2	0.8378	0.0970	3.30	5.02*
Red ginseng ginsenosides	Rg1	Y5 = 0.025476 + 0.00044X1 + 0.003333X2 + 0.000004911X1X1 − 0.000021429X2X2	0.8941	0.0440	11.00**	0.12
	Rb1	Y6 = 0.244762 + 0.003863X1 − 0.0035X2 + 0.000002232X1X1 − 0.000025X1X2 + 0.000035714X2X2	0.8718	0.0629	9.04**	0.04
Black ginseng ginsenosides	Rb1	Y7 = −0.118571 + 0.00703X1 + 0.005169X2 − 0.000007143X1X1 − 0.000075X1X2 − 0.000014286X2X2	0.9378	0.0159	20.03***	0.64
	Rg3	Y8 = −0.660476 + 0.012268X1 + 0.016833X2 − 0.000017411X1X1 − 0.000125X1X2 − 0.000078571X2X2	0.9105	0.0320	13.42**	0.52

X₁, ethanol conc. (%); X₂, temperature (°C).
Determination coefficients of polynomial equations.
Significant at 10% level
Significant at 5% level
Significant at 1% level.