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- W2071926186 abstract "In this work it is shown, for the first time, that aqueous solutions of poly(vinyl alcohol) (PVA) and acetonitrile (ACN) undergo liquid–liquid demixing and form aqueous two-phase systems (ATPS). The ternary phase diagrams composed of PVA of different molecular weights, namely 9000–10,000, 13,000–23,000, 31,000–50,000 g mol−1 and 85,000–124,000 g mol−1, acetonitrile and water, and the respective tie-lines were determined at 25 °C. In all the systems investigated, ACN is enriched in the top phase while PVA is found in the bottom phase. To explore the potentiality of these ATPS for extraction strategies, the partitioning of vanillin among the coexisting phases was further evaluated. The effects of ACN and PVA concentrations and temperature toward the vanillin partitioning were also investigated. An increased vanillin partitioning to the top phase was verified with the increase of the ACN concentration; however, the partition coefficient of vanillin for the ACN-rich phase decreases with the increase on both the PVA concentration and temperature. The highest partition coefficient of vanillin for the ACN-rich phase (2.24) was found with the system composed of 49 wt% of ACN + 9 wt% of PVA 9000–10,000 g mol−1 at 5 °C, with a recovery of 79%. The vanillin migration to the top phase is spontaneous and an exothermic process." @default.
- W2071926186 created "2016-06-24" @default.
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- W2071926186 date "2015-02-01" @default.
- W2071926186 modified "2023-10-17" @default.
- W2071926186 title "Poly(vinyl alcohol) as a novel constituent to form aqueous two-phase systems with acetonitrile: Phase diagrams and partitioning experiments" @default.
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- W2071926186 doi "https://doi.org/10.1016/j.cherd.2014.08.009" @default.
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