Improvement of D-Ribose Production from Corn Starch Hydrolysate by a Transketolase-Deficient Strain Bacillus subtilis UJS0717

Table 6

Analysis of variance for the response surface quadratic model of D-ribose concentration of Box-Behnken design.

Source	Sum of squares	df	Mean square	value	value; Prob. >
Model	779.43	9	86.60	83.91	<0.0001
	207.47	1	207.47	201.01	<0.0001
	6.90	1	6.90	6.69	0.0491
	16.05	1	16.05	15.55	0.0109
	0.24	1	0.24	0.23	0.6532
	0.15	1	0.15	0.14	0.7203
	5.24	1	5.24	5.08	0.0739
	490.36	1	490.36	475.09	<0.0001
	38.80	1	38.80	37.59	0.0017
	59.13	1	59.13	57.29	0.0006
Residual	5.16	5	1.03
Lack of fit	4.97	3	1.66	17.15	0.0556
Pure error	0.19	2	0.097
Cor. total	784.59	14

Note: CV% = 2.02; ; Adj. ; Pred. . Note: = glucose (g/L); = corn steep liquor (g/L); = (NH₄)₂SO₄ (g/L).
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