Table 2.
Significance of the regression models (F values) and the effects of variables on characteristics of dried Platycodon grandiflorum

Sources	L*	a*	b*	DB1)	TP1)	DPPH2)	ABTS2)
Regression	080.87**,3)	45.07**	8.91**	79.32**	247.23**	14.33**	19.56**
X11)	355.98**	203.50**	<0.01	328.40**	1120.73**	34.05**	80.92**
X21)	7.28*	8.26*	12.05*	7.76*	2.00	10.89*	5.13
X1×X2	8.53*	6.74*	7.11*	5.38	6.36*	12.64**	6.94*
X12	28.21**	0.14	8.46*	54.99**	101.66**	10.03*	0.43
X22	15.58**	6.42*	7.27*	9.68*	35.91**	9.42*	4.77
Lack of fit	54.92**	8.21*	12.33*	368.07**	3.51	973.95**	78.30**
r2	0.9830	0.9699	0.8642	0.9827	0.9944	0.9110	0.9332

X₁; drying temperature (oC), X₂; steaming time (min), DB; degree of browning, TP; total polyphenolic compound (g/g extract).
Replicated as RC₅₀ (mg/mL) (concentration for 50% reduction of DPPH and ABTS radicals at 15 and 5 min, respectively, after starting reaction).
p<0.05
p<0.01