INVESTIGADORES
PINOTTI Adriana Noemi
artículos
Título:
Films based on kefiran, an exopolysaccharide obtained from kefir grain:
Autor/es:
PIERMARÍA; PINOTTI, A.; GARCÍA; ABRAHAM
Revista:
FOOD HYDROCOLLOIDS
Editorial:
Elsevier
Referencias:
Lugar: Holanda; Año: 2009 vol. 23 p. 684 - 690
ISSN:
0268-005X
Resumen:
Kefiran, an exopolysaccharide produced by microorganisms present in the kefir grains, is a glucogalactan
that has several health promoting properties. In the present work, the ability of kefiran to form films and
the effect of glycerol addition at different concentrations on film properties was evaluated. Kefiran was
able to form films at concentrations ranging from 5 to 10 g/kg. The concentration 10 g/kg was selected
because the films were easily removed from the plate. All film-forming solutions exhibited a pseudoplastic
behavior; glycerol addition did not modify the solution rheological properties.
Kefiran films exhibited differential solubility characteristics, at the different assayed temperatures. These
films exhibited good water vapor barrier properties and the addition of 25 g of glycerol per 100 g of
polysaccharide allowed the optimum value of 4.09 1011 g/m s Pa to be obtained.
Films without glycerol were brittle and rigid since they showed high elastic modulus and tensile strength
values and low deformation at break. Glycerol addition led to extremely high elongation values, allowing
flexibilities comparable to those of synthetic materials.
Films without glycerol were brittle and rigid since they showed high elastic modulus and tensile strength
values and low deformation at break. Glycerol addition led to extremely high elongation values, allowing
flexibilities comparable to those of synthetic materials.
Films without glycerol were brittle and rigid since they showed high elastic modulus and tensile strength
values and low deformation at break. Glycerol addition led to extremely high elongation values, allowing
flexibilities comparable to those of synthetic materials.
Films without glycerol were brittle and rigid since they showed high elastic modulus and tensile strength
values and low deformation at break. Glycerol addition led to extremely high elongation values, allowing
flexibilities comparable to those of synthetic materials.
1011 g/m s Pa to be obtained.
Films without glycerol were brittle and rigid since they showed high elastic modulus and tensile strength
values and low deformation at break. Glycerol addition led to extremely high elongation values, allowing
flexibilities comparable to those of synthetic materials.