CIDCA   05380
CENTRO DE INVESTIGACION Y DESARROLLO EN CRIOTECNOLOGIA DE ALIMENTOS
Unidad Ejecutora - UE
artículos
Título:
Kefiran films plasticized with sugars and polyols: Water vapor barrier
Autor/es:
PIERMARÍA, J; BOSCH, A; PINOTTI, A; YANTORNO, O; GARCÍA, M.A; ABRAHAM, A
Revista:
FOOD HYDROCOLLOIDS
Editorial:
ELSEVIER SCI LTD
Referencias:
Año: 2010
ISSN:
0268-005X
Resumen:
Kefiran, an exopolysaccharide produced by microorganisms present in kefir grains, is a glucogalactan that has several health promoting properties. In the present work the effect of different sugars (glucose, galactose, sucrose) and polyols (glycerol and sorbitol) as plasticizers on kefiran film properties was evaluated. Kefiran films were brittle and rigid and all the tested plasticizers improved film properties. They were all transparent with low opacity. Unplasticized kefiran films X-ray diffraction patterns were similar to those of plasticized ones, showing an amorphous-crystalline structure with low crystallinity degree. Allfiran, an exopolysaccharide produced by microorganisms present in kefir grains, is a glucogalactan that has several health promoting properties. In the present work the effect of different sugars (glucose, galactose, sucrose) and polyols (glycerol and sorbitol) as plasticizers on kefiran film properties was evaluated. Kefiran films were brittle and rigid and all the tested plasticizers improved film properties. They were all transparent with low opacity. Unplasticized kefiran films X-ray diffraction patterns were similar to those of plasticized ones, showing an amorphous-crystalline structure with low crystallinity degree. Allfiran film properties was evaluated. Kefiran films were brittle and rigid and all the tested plasticizers improved film properties. They were all transparent with low opacity. Unplasticized kefiran films X-ray diffraction patterns were similar to those of plasticized ones, showing an amorphous-crystalline structure with low crystallinity degree. Allfiran films were brittle and rigid and all the tested plasticizers improved film properties. They were all transparent with low opacity. Unplasticized kefiran films X-ray diffraction patterns were similar to those of plasticized ones, showing an amorphous-crystalline structure with low crystallinity degree. Allfiran films X-ray diffraction patterns were similar to those of plasticized ones, showing an amorphous-crystalline structure with low crystallinity degree. Allystallinity degree. All films presented low aw values (below 0.5) conferring protection properties against microorganism growth. The lowest permeability value was obtained with glucose as plasticizer whereas the best mechanical properties were obtained with glycerol addition. The relative high intensities of the bands assigned to water molecules stretching and bending modes in ATR/FT-IR average spectra of glycerolekefiran films were correlated with their relative high water content compared to the other plasticized films. The analysis of the bands due to CeH stretching modes showed that glucose and glycerol could be reducing the interaction between the adjacent chains in the kefiran polymer. Besides, it could be demonstrated that the importance of the analysis of kefiran, plasticizers and water molecules interactions when films properties are studied.lms presented low aw values (below 0.5) conferring protection properties against microorganism growth. The lowest permeability value was obtained with glucose as plasticizer whereas the best mechanical properties were obtained with glycerol addition. The relative high intensities of the bands assigned to water molecules stretching and bending modes in ATR/FT-IR average spectra of glycerolekefiran films were correlated with their relative high water content compared to the other plasticized films. The analysis of the bands due to CeH stretching modes showed that glucose and glycerol could be reducing the interaction between the adjacent chains in the kefiran polymer. Besides, it could be demonstrated that the importance of the analysis of kefiran, plasticizers and water molecules interactions when films properties are studied.ekefiran films were correlated with their relative high water content compared to the other plasticized films. The analysis of the bands due to CeH stretching modes showed that glucose and glycerol could be reducing the interaction between the adjacent chains in the kefiran polymer. Besides, it could be demonstrated that the importance of the analysis of kefiran, plasticizers and water molecules interactions when films properties are studied.films. The analysis of the bands due to CeH stretching modes showed that glucose and glycerol could be reducing the interaction between the adjacent chains in the kefiran polymer. Besides, it could be demonstrated that the importance of the analysis of kefiran, plasticizers and water molecules interactions when films properties are studied.firan polymer. Besides, it could be demonstrated that the importance of the analysis of kefiran, plasticizers and water molecules interactions when films properties are studied.films properties are studied.