Table 4. The range analysis of flavourzyme on DH obtained from the L9 (34) orthogonal experiment

No.	(A)	(B)	(C)	(D)	DH (%)
1	1	1	1	1	42.64
2	1	2	2	2	40.98
3	1	3	3	3	32.47
4	2	1	2	3	46.76
5	2	2	3	1	34.65
6	2	3	1	2	35.34
7	3	1	3	2	35.96
8	3	2	1	3	33.56
9	3	3	2	1	43.45
K1	38.70	41.79	37.18	40.25
K2	38.92	36.4	43.73	37.43
K3	37.66	37.09	34.36	37.60
Best level	A2	B1	C2	D1
R	1.26	5.39	9.37	2.65
R order	C>B>D>A

Four controllable variables, including time (A), temperature (B), pH (C), and the amount of flavourzyme added (D) were selected for optimization.
DH, degree of hydrolysis.