Table 3. Polynomial equations and F-value calculated by response surface methodology for taegeuk ginseng ginsenosides

Responses		Polynomial equations1)	R2	Significance	F-value
					Acetic acid conc.	Soaking time
Protopanaxadiol ginsenosides	Rb1	Y1 = 7.13 – 0.35X1 – 1.95X2 + 0.01X1X1 = 0.02X1X2 + 0.26X2X2	0.84422)	0.0901	2.22	6.44*
	Rb2	Y2 = 4.28 – 0.22X1 – 0.98X2 + 0.01X1X1 + 0.01X1X2 + 0.11X2X2	0.8422	0.0922	1.89	6.00*
	Rb3	Y3 = 0.46 – 0.02X1 – 0.10X2 + 0.01X2X2	0.7762	0.1722	1.24	3.77
	Rc	Y4 = 3.19 – 0.16X1 – 0.68X2 + 0.01X1X1 + 0.10X2X2	0.7696	0.1811	1.76	3.41
	Rd	Y5 = 0.62 – 0.02X1 – 0.24X2 + 0.05X2X2	0.6197	0.4102	0.33	2.15
	Rg3	Y6 = 0.60 – 0.04X1 – 0.21X2 + 0.02X1X2	0.7317	0.2348	2.41	2.28
Protopanaxatriol ginsenosides	Re	Y7 = 3.76 – 0.12X1 – 0.78X2 + 0.01X1X1 – 0.06X1X2 + 0.29X2X2	0.9183	0.0268	6.15*	14.04**
	Rf	Y8 = 1.98 – 0.09X1 – 0.50X2 + 0.08X2X2	0.9237	0.0236	4.93*	14.18**
	Rg1	Y9 = 4.33 – 0.16X1 – 1.18X2 + 0.01X1X1 + 0.01X1X2 + 0.14X2X2	0.9007	0.0389	3.01	10.65**
	Rg2	Y10 = 0.30 – 0.01X1 – 0.01X2 – 0.01X1X2 + 0.04X2X2	0.7683	0.1829	3.06	3.89
	Rh1	Y11 = 0.28 – 0.02X1 – 0.08X2 + 0.01X1X2	0.4439	0.6861	1.04	0.14
Total ginsenoside		Y12 = 26.54 – 1.18X1 – 6.65X2 + 0.04X1X1 – 0.02X1X2 + 1.07X2X2	0.9236	0.0236	5.24*	14.19**

X1, acetic acid conc. (%); X2, soaking time (h).
R², determination coefficients of polynomial equations.
significant at 10% level
significant at 5% level.