期刊
JOURNAL OF MEMBRANE SCIENCE
卷 194, 期 2, 页码 165-175出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0376-7388(01)00487-2
关键词
facilitated transport; sugar separation; diffusion; foods; composite membranes
Mechanistic insight is gained for saccharide transport through plasticized cellulose triacetate (CTA) membranes containing lipophilic ion-pair transport carriers. The molecular structures of the different membrane components are systematically varied and diagnostic transport characteristics such as saccharide-carrier diffusion constant and saccharide extraction constant are determined. The observed percolation thresholds support a jumping mechanism, however, the diffusion constants are found to decrease as the size of the saccharide, carrier cation, and carrier anion increase, indicating that the rate-limiting step in the transport process involves diffusion of a complex comprised of all three components. The data is reconciled in terms of mobile-site jumping mechanism where the saccharide is relayed along a sequence of ion-pair carriers that are locally mobile. In an attempt to improve saccharide selectivity, calix-[4]-arene dicarboxylates were evaluated as potential ditopic transport carriers. This produced no major change in saccharide extraction constants. (C) 2001 Elsevier Science B.V. All fights reserved.
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