Table 1.
Central composite face-centered (CCF) design matrix and response1) for characteristics of dried Platycodon grandiflorum

Run	Coded (actual) levels		L*	a*	b*	DB2)	TP2)	DPPH3)	ABTS3)
Run	DT2)	ST2)	L*	a*	b*	DB2)	TP2)	DPPH3)	ABTS3)

1	-1 (45)	1 (45)	82.66	2.63	25.70	0.29	17.81	14.44	13.28
2	0 (60)	0 (30)	71.61	6.68	27.82	1.19	36.26	5.99	5.37
3	1 (75)	-1 (15)	61.76	8.33	19.95	2.79	60.96	2.06	2.13
4	0 (60)	0 (30)	70.71	7.55	29.00	1.24	37.36	6.07	5.34
5	0 (60)	0 (30)	71.20	7.13	28.73	1.22	38.92	5.90	5.65
6	-1 (45)	0 (30)	80.06	2.49	24.55	0.29	27.11	4.63	6.92
7	-1 (45)	-1 (15)	80.06	3.25	24.43	0.27	24.89	5.26	8.01
8	0 (60)	-1 (15)	77.87	4.49	25.33	0.64	31.40	7.36	5.94
9	1 (75)	1 (45)	54.89	10.99	27.59	3.87	61.12	2.01	2.11
10	0 (60)	1 (45)	71.43	6.89	26.58	1.11	33.35	8.72	6.26
11	1 (75)	0 (30)	51.17	11.10	27.05	4.36	65.40	1.71	1.85
12	0 (60)	0 (30)	71.23	7.10	28.50	1.23	37.52	6.03	5.20
13	0 (60)	0 (30)	71.00	7.00	28.00	1.21	38.22	5.98	5.51

D14)	45	-	88.98	1.50	13.05	0.21	-	-	-
D24)	60	-	86.83	2.11	15.34	0.28	-	-	-
D34)	75	-	80.33	4.34	18.59	0.63	-	-	-

Mean values of three measurements.
DT; drying temperature (°C), ST; steaming time (min), DB; degree of browning, TP; total polyphenol (mg/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).
Platycodon grandiflorum dried at applied drying temperature without steaming.