Facilitated transport of ethyl docosahexaenoate through solution-cast perfluorosulfonated ionomer membranes

Abstract

ABSTRACT:The facilitated transport of ethyl docosahexaenoate (DHA-Et) through the thin solution-cast perfluorosulfonated ionomer membranes has been studied. The carrier of DHA-Et was silver ion and was immobilized in the support ionomer membrane by electrostatic forces. In this system, the feed phase, membrane phase, and receiving phase had the same solvent. This system was already proved to be highly stable in our previous work. When ethanol/water (85/15) was used as the solvent, the DHA-Et permeance in the cast membrane was about four times higher than that in the commercial Nafion 117 membrane, due to the smaller membrane thickness. In the case of acetone solvent, a high selectivity of DHA-Et to ethyl oleate of 42 and a high facilitation factor of 153 were obtained. These membrane performances were superior to those of the Nafion 117 membrane. The effects of membrane preparation conditions, such as annealing temperature and kinds of polar solvents added to the ionomer solution before annealing, on the membrane performance was investigated in detail. Furthermore, small-angle X-ray scattering (SAXS) measurement was carried out to study the membrane structure. The experimental result suggests higher crystallinity in the cast membrane annealed at higher temperature.

Modeling of extraction behavior of docosahexaenoic acid ethyl ester by utilizing slug flow prepared by microreactor

“…For the last several decades, some techniques for separation and purification of PUFAs were proposed, studied, and developed. [4][5][6][7][8][9][10][11][12][13] Among the techniques, the separation method of PUFA ethyl esters (PUFA-Ets) utilizing liquid-liquid extraction with silver ion 8 has attracted attention as an effective method and has been expanded into more effective techniques using supported liquid membrane (SLM), 9,10 emulsion liquid membrane (ELM), 11,12 and slug flow prepared by microchip. 13 Above all, we have directed our attention to utilizing slug flow prepared by microchip.…”

Electrochemical Study of the Assisted Transfer of Silver Ion by 1,5-Cyclooctadiene at the 1,6-Dichlorohexane | Water Interface

“…Recently, the formation of π-complex of Ag + ion has been utilized in, e.g., the separation of polyunsaturated fatty acids, such as eicosapentaenoic and docosahexaenoic acids, from other fatty acids in fish oils. 22,23 Well-defined voltammetric waves due to the assisted transfer of Ag + ion have been observed at the DCH | W interface by addition of 5,8,11,14,17-eicosapentaenoic and 4,7,10,13,16,19-docosahexaenoic acid ethyl esters to the DCH-phase. The voltammetric results and the analytical application will be published in a following paper.…”

Kinetic compensation effect in thermal decomposition of cellulosic materials in air atmosphere

“…Therefore, there is a great demand for development of an effective separation and purification technique of PUFAs. For the last several decades, some techniques for separation and purification of PUFAs were proposed, studied, and developed 4–13. Among the techniques, the separation method of PUFA ethyl esters (PUFA‐Ets) utilizing liquid–liquid extraction with silver ion8 has attracted attention as an effective method and has been expanded into more effective techniques using supported liquid membrane (SLM),9, 10 emulsion liquid membrane (ELM),11, 12 and slug flow prepared by microchip 13.…”