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

Table 3

Parameters of equation (5) for the mixture of polyethylene glycol/isopropyl alcohol + ethanol + salt (Na₂CO₃/Na₂SO₄) + water ATPSs at different temperatures.

T (K)	A	b	c	R^2	sd^a
Polyethylene glycol + ethanol + Na2SO4
308.15	0.8671	−4.3489	109.7341	0.9994	0.0026
318.15	0.8701	−4.1565	134.3256	0.9989	0.0031
328.15	0.8373	−3.9198	156.0095	0.9993	0.0029
Isopropyl alcohol + ethanol + Na2SO4
308.15	0.6754	−3.4891	58.8451	0.9997	0.0014
Isopropyl alcohol + ethanol + Na2CO3
308.15	0.6964	−3.9363	103.3516	0.9994	0.0015
Isopropyl alcohol + ethanol + Na2CO3
308.15	0.6964	−3.9363	103.3516	0.9994	0.0015

, where is the experimental mass fraction of the alcohol mixture, is the corresponding data calculated using equation (5), and “N” represents the number of binodal data points.