The Research and Mechanism of Extracting Vitamin B6 Using Aqueous Two-Phase Systems

Table 7

Parameters of equation (8) for the mixture of polyethylene glycol/isopropyl alcohol + ethanol + salt (Na₂CO₃/Na₂SO₄) + water ATPSs at different temperatures.

T (K)	ks	Intercept	R^2	δ (ks)^b	δ (intercept)^c	sd^a
Polyethylene glycol + ethanol + Na2SO4
308.15	1568.3615	0.1233	0.9860	93.3915	0.0660	0.0032
318.15	3330.5112	−0.4158	0.9908	159.8895	0.1000	0.0033
328.15	1312.4646	0.3960	0.9918	59.5733	0.0514	0.0523
Isopropyl alcohol + ethanol + Na2SO4
308.15	970.6802	0.0941	0.9976	23.9236	0.0242	0.0510
Isopropyl alcohol + ethanol + Na2CO3
308.15	1699.3959	−0.1288	0.9941	65.3520	0.0312	0.0011

, where N is the number of tie-lines and j is the number of components in each phase. δ (k_s)^b is the standard deviation for the fitting parameters of “k_s.” δ (intercept)^c is the standard deviation of the fitting parameters of the “intercept.”