Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 552185
Title Scaling of Flory-Huggins interaction parameter for polyols with chain length and number of hydroxyl groups
Author(s) Sman, R.G.M. van der
Source Food Hydrocolloids 96 (2019). - ISSN 0268-005X - p. 396 - 401.
DOI https://doi.org/10.1016/j.foodhyd.2019.05.042
Department(s) VLAG
Food Technology
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Flory-huggins - Hydrophilicity - Sorption isotherm - Thermodynamics
Abstract

The Flory-Huggins-Free-Volume (FHFV)theory, describing the moisture sorption of carbohydrates, is extended towards a wider range of compounds. Earlier application of the FHFV theory has been to carbohydrate/water mixtures, as can be found in foods. Now, we have extended the theory towards polyols (or polyalcohols)which are investigated in as proxies for secondary organic aerosols, whose behaviour is important for understanding climate behaviour. The investigated polyols are characterized by the ratio of the number hydroxyl groups NOH and the number of carbon atoms NC, which is often lower than ratios found in carbohydrates in food materials. We have found that the value of the Flory-Huggins interaction parameter is a function of the solute molecular properties, namely its chain length NC and the ratio NOH/NC of the solute. The deviation of this ratio from [Formula presented] can be viewed as a measure for its hydrophilicity. For food science, the extension of the theory has also significant implications, as the interaction parameter of newly investigated ingredients (rich in hydroxyl groups)can be estimated by means of the molecular properties. One must think of insoluble food fibers like xylan-glucans or arabinoxylans, or modified biopolymers based on starch or cellulose.

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