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

Table 4

Parameters of equation (6) for the mixture of polyethylene glycol/isopropyl alcohol + ethanol + salt (Na₂CO₃/Na₂SO₄) + water ATPSs at different temperatures.

T (K)	a	b	c	d	R^2	sd^a
Polyethylene glycol + ethanol + Na2SO4
308.15	0.3743	−10.4446	19.8237	−66.6584	0.9998	0.0016
318.15	0.9548	−15.6799	33.8056	−95.7524	0.9998	0.0014
328.15	0.5006	−12.0065	26.4493	−90.6419	0.9997	0.0021
Isopropyl alcohol + ethanol + Na2SO4
308.15	−0.2676	−5.1976	6.3059	−27.3198	0.9996	0.0015
Isopropyl alcohol + ethanol + Na2CO3
308.15	−0.2894	−5.2276	5.8930	−35.9710	0.9996	0.0013

^aDefinition is given in Table 3.