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Title

Thermostability analyses of glucomannan gels. Concentration influence

AuthorsHerranz, Beatriz CSIC ORCID ; Borderías, A. Javier CSIC ORCID ; Sólo de Zaldívar, M. Beatriz CSIC ; Solas, M. Teresa; Tovar, C. A.
Issue Date2012
PublisherElsevier
CitationFood Hydrocolloids 29: 85- 92 (2012)
AbstractThis paper examines the thermostability of glucomannan gels (3 and 5 %) deacetylated with 0.6 N KOH (A3, A5) and 1 N NaOH (B3, B5) at both concentrations. Gels were heated at heat treatment temperature (T ht): 25, 50, 70 and 90 °C for 20 min. Different analyses: puncture, small amplitude oscillatory shear (SAOS) and scanning electron microscopy (SEM) were made at 25 °C. All gels (irrespective of alkali and glucomannan concentration) behaved as thermo-irreversible with permanently bonded networks. Some structural differences were found depending on the alkali and glucomannan concentration and T ht range: increased T ht produced stronger networks in A3 and B3, which were more orderly in A3. At high T ht, A3 had a more elastic network, with higher water binding capacity (WBC) than B3. At 5% glucomannan, gel networks (A5-B5) were tighter and were less reinforced by temperature. Mechanical and rheological analyses were consistent with the structures shown in SEM photographs. © 2012 Elsevier Ltd.
URIhttp://hdl.handle.net/10261/61406
DOIhttp://dx.doi.org/10.1016/j.foodhyd.2012.02.011
Identifiersdoi: 10.1016/j.foodhyd.2012.02.011
issn: 0268-005X
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