Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/6857
Título: Dynamic mechanical thermal analysis of aqueous sugar solutions containing fructose, glucose, sucrose, maltose and lactose
Autor: Cruz, Isabel B.
Oliveira, Jorge C.
MacInnes, William M.
Palavras-chave: Biomaterials science
Frequency-response analysis
Glass transition
Molecular mobility
WLF equation
Data: 2001
Editora: Wiley
Citação: CRUZ, Isabel B. ; OLIVEIRA, Jorge C. ; MACINNES, William M. - Dynamic mechanical thermal analysis of aqueous sugar solutions containing fructose, glucose, sucrose, maltose and lactose. International Journal of Food Science & Technology. ISSN: 1365-2621. Vol. 36, n.º 5 (2001), p. 539–550
Resumo: The glass transition of glucose, fructose, lactose, maltose and sucrose solutions at maximum cryo-concentration was studied by Dynamic Mechanical Thermal Analysis (DMTA), using the disc bending technique. The glass transition temperatures were determined from the peaks in the loss modulus E′′, which corresponds theoretically to the resonance point (Maxwell model) for several input frequencies. The frequency dependence was well described by both an Arrhenius-type model and by the WLF (Williams, Landel and Ferry) equation, yielding glass transition temperatures for an average molecular vibration time of 100 s, which were similar to published midpoint temperatures determined by DSC scans. Some sugar mixtures were studied, yielding results that were well described by the Gordon–Taylor equation, using literature data. The frequency dependence of the viscoelastic ratio was also well approximated by an Arrhenius-type equation, with activation energies similar to those of the glass transition temperature and corresponded well to published values of the endset of glass transition.
Peer review: yes
URI: http://hdl.handle.net/10400.14/6857
Versão do Editor: The definitive version is available at www3.interscience.wiley.com
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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