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2008
- handle: 10670/1.zsx7if
- 1665-5745
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http://www.redalyc.org/revista.oa
e-Gnosis
Mots-clés
Multidisciplinarias (Ciencias Sociales) Aggregates biopolymers polysaccharides shear viscositySujets proches
Levans Fructosans Magueys Century plants AgaveCiter ce document
Jamné A. Ponce S. et al., « Physical-Chemical and non-linear rheological properties of aqueous solutions of agave fructans », e-Gnosis, ID : 10670/1.zsx7if
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Résumé
"Fructans are storage carbohydrates with B-fructofuranosyl linkages that are present in several plant families. Those studied in this work were obtained using a technology based on water extraction from mature hearts of Agave tequilana Weber var. azul. It is known that agave fructan molecules are branched while commercial inulin (from Cichorium intybus) is a linear molecule, which could provide different properties and technological applications. In this study, agave fructans resulted on a mixture of different size molecules with an average molecular weight of 3,182 Da and an average polymerization degree of 18. Aqueous solutions of agave fructans were prepared (5-90 Wt. %) and subjected to a battery of tests such as pH and density at 30, 40, 50 and 60°C; additionally, conductivity and particle size (QLS) were analyzed at room temperature. Results suggested that fructans can probably form aggregates at concentrations higher than 28 wt %. Non linear rheological measurements were carried out at 30, 40, 50 and 60°C, previous stabilization of the samples at measurement temperature, showing that solutions have a Newtonian behavior except those at 80 and 90 Wt. % where shear thickening and thinning behaviors were observed. Finally, the rheological results supported the formation of aggregates in concentrations from 30 up to 70 wt %, through a steady shear rate measurements carried out at 30, 40, 50 and 60°C."