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The polarities of the co-existing phases of a polyethylene glycol (PEG)-2000–K 3 PO 4 aqueous biphasic system (ABS) have been examined using Reichardt’s carboxylated pyridinium-N-phenoxybetaine dye as a probe. Using this probe, the polarities of these phases have been compared to those of conventional solvent extraction systems and micellar systems using values obtained from the literature...
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