Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/5470
Título: Rheological study into the ageing process of high methoxyl pectin/sucrose aqueous gels
Autor: Silva, J. A. Lopes da
Gonçalves, M. P.
Data: 1994
Editora: Elsevier
Citação: SILVA, J. A. Lopes da ; GONÇALVES, M. P. - Rheological study into the ageing process of high methoxyl pectin/sucrose aqueous gels. Carbohydrate Polymers. ISSN 0144-8617. Vol. 24, n.º 4 (1994), p. 235-245
Resumo: The ageing process of high methoxyl pectin (HMP)/sucrose gels was followed at different ageing temperatures by small amplitude oscillatory experiments. Dynamic mechanical measurements allowed the characterisation of the point at which the system undergoes the sol/gel transition. The HMP/sucrose system is extremely sensitive to temperature variation during ageing, especially in the lower temperature range. The viscoelastic behaviour through the gel point changes with the ageing temperature, probably due to variations in mobility of the pectin chains, and consequently, in the lifetime of junction zones. Weaker pectin networks are formed under thermal conditions unfavourable to the development of hydrophobic interactions. Gel time and elastic modulus have a complex dependence on temperature, which could be attributed to the different thermal behaviour of the intermolecular interactions that stabilise the nonpermanent cross links of these physical networks.
Peer review: yes
URI: http://hdl.handle.net/10400.14/5470
Versão do Editor: http://www.sciencedirect.com/science/article/pii/014486179490068X
Aparece nas colecções:ESB - Artigos em revistas internacionais com Arbitragem / Papers in international journals with Peer-review

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