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Dextrans ( M W =11.000 and M w =40.000) have been modified with 4-hexyl benzoyl chloride and their aggregation behavior was studied in aqueous solution employing the fluorescent probes pyrene and 1,8 anilinonaphtalene sulfonic acid sodium salt (1,8 ANS). The photophysical studies showed that...
The constitution of konjac glucomannan was determined by methylation analysis and 13 C NMR spectroscopy. The results of methylation analysis showed that the branching point is C-6 carbon of glucosyl units. 13 C NMR spectroscopy (1D and DEPT) of konjac glucomannan supported the presence of...
Podocarpus lambertii , a Podocarpaceae, is a member of the most diverse family of conifers and Araucaria angustifolia , which belongs to the Araucariaceae family, is a typical gymnosperm from Southern Brazil. A structural characterisation of their hemicelluloses was carried out. The...
In-line slit and capillary die viscometers were specially designed to study the viscoelastic behavior of plasticized wheat starch under low-hydrated conditions. A wide range of shear rates could be obtained by the use of different die geometries. The effects of temperature (110–150 °C),...
A quantitative method for selecting the most suitable biopolymers blends for lipid materials microencapsulation is proposed. Aqueous solutions of carbohydrate polymers blends (gum arabic (GA), mesquite gum (MG) and maltodextrin DE 10 (MD)) were prepared in accordance to a Simplex Centroid...
An isozyme of Aspergillus niger pectinase could depolymerize chitosan and its derivatives. The isozyme showed optimum depolymerization at pH 3.0 and 47 °C and exhibited classical Michaelis–Menten kinetics with a K m and a V max of 3.12 mg ml −1 and 153.85 nmol min −1 mg −1 ,...
Effect of physical aging at different temperatures ( T a ) on the amorphous transitions of normal and waxy rice starches has been investigated using differential scanning calorimetry (DSC). Glass transition temperature ( T g ) increased, but ΔC p at the T g decreased, as the difference ( T g −...
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