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State Diagrams of Arabinoxylan-water Binaries by Dimitrios Fessas; Alberto Schiraldi is a Materials Science article available to read on EtoBox.

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Since Arabinoxylans are natural polysaccharides that seem promising candidates as cryostabilizers, the state diagram (i.e. the representation in the temperature-composition plan of the macroscopic phases) of their aqueous solutions seemed worth determining. Two lots of puri®ed water extractable arabinoxylans (WEA) of different molecular mass (56 and 410 kDa labeled as LMW-AX and HMW-AX, respectively) were used to prepare aqueous solutions of various composition. These were cooled below their freezing point and annealed for 2 h at a suitable temperature before a DSC 58C min À1 heating run aimed at determining their primary glass transition temperature, T H g , and the onset of ice fusion. Once the corresponding composition, C H g , was assessed, the main curves of the corresponding state diagram were drawn. As expected, the T H g value drawn for HMW-AX was higher (À178C) than for LMW-AX (À358C). The C H g was instead found close to 75% w/w for both HMW-AX and LMW-AX. The ®ctitiousness of this coincidence could be easily recognized by expressing the solute concentration in molar fraction, X: it was then possible to verify that, as expected, X H g for LMW-AX was one order of magnitude

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Author

Dimitrios Fessas; Alberto Schiraldi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0040-6031)

Published

2001

Language

EN

Field

Materials Science (Physical Sciences)