Table 1.

Orthogonal test design of the AprY fermentation process.

	A Glycerol (%)	B K2HPO4:KH2PO4	C MnSO4 (mol/L)	D CaCl2 (g/L)
1	0	0.1	10−3	0.2
2	0.2	0.2	10−4	0.3
3	0.4	0.3	10−5	0.4