TABLE 4.

ANOVA for the surface quadratic model when diacetylated lactonic C18:1 production and productivity were used as outcomes.

		Diacetylated lactonic C18:1 production (R 2 = 84.31%)		Diacetylated lactonic C18:1 productivity (R 2 = 86.23%)
Source	DF	Mean square	p-value	Mean square	p-value
Model	9	0.0856	<0.0001 a	0.0002	<0.0001 a
${\mathit{X}}_{\mathbf{1}}$ -glucose	1	0.2923	<0.0001 a	0.0003	<0.0001 a
${\mathit{X}}_{\mathbf{2}}$ -nitrogen	1	0.0054	0.3610	0.0000	0.0679
${\mathit{X}}_{\mathbf{3}}$ -time	1	0.1765	<0.0001 a	0.0007	<0.0001 a
${\mathit{X}}_{\mathbf{1}}{\mathit{X}}_{\mathbf{2}}$	1	0.0010	0.6952	0.0000	0.3424
${{\mathit{X}}_{\mathbf{1}}\mathit{X}}_{\mathbf{3}}$	1	0.0189	0.0951	1.218 × 10−6	0.7394
${\mathit{X}}_{\mathbf{2}}{\mathit{X}}_{\mathbf{3}}$	1	0.0597	0.0051 a	0.0001	0.0028 a
${{\mathit{X}}_{\mathbf{1}}}^{\mathbf{2}}$	1	0.0416	0.0166 a	0.0000	0.0432 a
${{\mathit{X}}_{\mathbf{2}}}^{\mathbf{2}}$	1	0.1145	0.0003 a	0.0002	0.0006 a
${{\mathit{X}}_{\mathbf{3}}}^{\mathbf{2}}$	1	0.0090	0.2420	0.0000	0.2844
Residual	23	0.0062		0.0000
Lack of fit	17	0.0068	0.3377	0.0000	0.0513

^a Significant parameters (p < 0.05).

Bold values represent parameters interaction.