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Oxidation of oat ß-glucan in aqueous solutions during processing.
Kivelä, R; Henniges, U; Sontag-Strohm, T; Potthast, A.
Afiliação
  • Kivelä R; Department of Food and Environmental Sciences, P.O. Box 66, FIN-00014, University of Helsinki, Finland. Electronic address: reetta.kivela@helsinki.fi.
  • Henniges U; Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria.
  • Sontag-Strohm T; Department of Food and Environmental Sciences, P.O. Box 66, FIN-00014, University of Helsinki, Finland.
  • Potthast A; Department of Chemistry, University of Natural Resources and Applied Life Sciences, Vienna, Austria.
Carbohydr Polym ; 87(1): 589-597, 2012 Jan 04.
Article em En | MEDLINE | ID: mdl-34663008
ABSTRACT
The study investigated carbonyl group formation along the chain and the chain cleavage of cereal ß-glucan during heat treatments, high pressure homogenisation, cold storage and ascorbic acid treatment of aqueous solutions of this soluble dietary fibre. The carbonyl group content and its distribution along the chain were simultaneously determined with the chain cleavage using a HPSEC/labelling method, originally developed for water-insoluble cellulose. Ascorbic acid treatment resulted in a relatively high degree of carbonyl content and extensive degradation of ß-glucan, even in concentrations typically found in foods. The thermal oxidation of the ß-glucan was considerable at 120°C in a ß-glucan solution with co-extracted compounds from oat ingredient, and in the highly purified solutions in presence of ferrous ions. Oxidation also probably contributed to the molecular properties during high pressure homogenisation, even thou the main degradation mechanism is the hydrolysis caused by mechanical energy. In addition to the cleavage of the ß-glucan chain, the formation of compact, high molar mass species or molecule clusters were obtained in the study after ascorbic acid, heat (120°C) and homogenisation treatments.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2012 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2012 Tipo de documento: Article