. 2019 Oct 1;8(10):445. doi: 10.3390/antiox8100445

Table 3.

Polynomial equations of the models in terms of coded factors.

Response	Unit	The Equation Coefficients: a × X₁² + b × X₂² + c × X₃² + d × X₁ × X₂ + e × X₁ × X₃ + f × X₂ × X₃ + g × X₁ + h × X₂ + i × X₃ + j
		a	b	c	D	e	f	g	h	i	j
TP	mg/mL	−113.482 ^a	16.020	−57.818 ^b	20.547	−43.631	−10.56	−156.966 ^a	83.702 ^a	75.393 ^a	653.045
TPy	mg/g mL	−144.084 ^a	22.256	−51.862	25.684	−5.703	−36.864	−195.495 ^a	109.235 ^a	−81.642 ^a	816.306
Gla	μg/mL	2.384 ^a	2.058 ^a	1.283 ^a	0.459	0.863	0.708	4.329 ^a	2.135 ^a	1.972 ^a	5.746
Iso	μg/mL	0.271	0.451	0.237 ^b	1.032 ^a	−0.003	0.055	0.146	0.748 ^a	0.919 ^a	2.864

X₁ = glycerol content, X₂ = temperature, X₃ = weight of the plant material in 10 mL of solvent. TP, Gla, Iso: concentration of total phenols, glabridin and isoliquiritigenin, respectively. ^a,b = The significant equation terms ^a = p < 0.05, ^b = p < 0.1.