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Abstract:

Cell wall-enriched pumpkin (Cucumis moschata Duch.) powder was submitted to enzymatic hydrolysis by cellulase or hemicellulase in order to evaluate the performance of these cell wall-degrading enzymes on that substrate. Different enzyme-substrate ratios were evaluated and the effect exerted by the buffer on cell wall polysaccharides. Cellulase produced the release of pectin macromolecules which include homogalacturonans side chains, the rhamnogalacturonan I core and rhamnogalacturonan II, in conjunction with xylogalacturonans. The content of galacturonic acid in product obtained ranged from 545 to 781 g/kg of fiber. Hemicellulases produced intense pectin hydrolysis leading to fiber-fractions with galacturonic acid contents ranging from 390 to 444 g/kg of fiber and enriched in glucose polymers as the enzyme proportion increased. Few rhamnogalacturonan-I was present.The acidic citrate buffer (pH 5.2) used for allowing enzyme activity could per se remove noncovalent cross-links like ionic bonds. As a consequence, pectin-in-extensin entanglements, pectins joined by Ca2+-bridges through the homogalacturonan side chains, and some pectins that are originally soluble in cold water due to little or no binding to the cell wall, could be removed by this citrate buffer. Enzymatic hydrolysis as well as buffer extraction produced fiber-products with an important thickening effect of aqueous systems. This effect was smaller as the ratio enzyme-substrate was increased and, in general, the fiber fractions isolated produced an in vitro glucose diffusion retardation. © 2007 SAGE Publications.

Registro:

Documento: Artículo
Título:Characterisation of fiber obtained from pumpkin (cucumis moschata duch.) mesocarp through enzymatic treatment
Autor:Fissore, E.N.; Ponce, N.M.; Stortz, C.A.; Rojas, A.M.; Gerschenson, L.N.
Filiación:Departamento de Industrias, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Departamento de Qumica Orgnica-CIHIDECAR, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Agencia Nacional de Promoción Cientiacute;fica y Tecnológica, ANPCyT, Argentina
National Research Council, CONICET, Argentina
Palabras clave:Enzymes; Industrial wastes; Pectin; Pumpkin; Cells; Enzyme kinetics; Fruits; Hydrolysis; Industrial wastes; Macromolecules; pH effects; Polysaccharides; Acidic citrate buffers; Enzymatic treatment; Pectin; Pumpkin; Fibers; Cucumis
Año:2007
Volumen:13
Número:2
Página de inicio:141
Página de fin:151
DOI: http://dx.doi.org/10.1177/1082013207077914
Título revista:Food Science and Technology International
Título revista abreviado:Food Sci. Technol. Int.
ISSN:10820132
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10820132_v13_n2_p141_Fissore

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Citas:

---------- APA ----------
Fissore, E.N., Ponce, N.M., Stortz, C.A., Rojas, A.M. & Gerschenson, L.N. (2007) . Characterisation of fiber obtained from pumpkin (cucumis moschata duch.) mesocarp through enzymatic treatment. Food Science and Technology International, 13(2), 141-151.
http://dx.doi.org/10.1177/1082013207077914
---------- CHICAGO ----------
Fissore, E.N., Ponce, N.M., Stortz, C.A., Rojas, A.M., Gerschenson, L.N. "Characterisation of fiber obtained from pumpkin (cucumis moschata duch.) mesocarp through enzymatic treatment" . Food Science and Technology International 13, no. 2 (2007) : 141-151.
http://dx.doi.org/10.1177/1082013207077914
---------- MLA ----------
Fissore, E.N., Ponce, N.M., Stortz, C.A., Rojas, A.M., Gerschenson, L.N. "Characterisation of fiber obtained from pumpkin (cucumis moschata duch.) mesocarp through enzymatic treatment" . Food Science and Technology International, vol. 13, no. 2, 2007, pp. 141-151.
http://dx.doi.org/10.1177/1082013207077914
---------- VANCOUVER ----------
Fissore, E.N., Ponce, N.M., Stortz, C.A., Rojas, A.M., Gerschenson, L.N. Characterisation of fiber obtained from pumpkin (cucumis moschata duch.) mesocarp through enzymatic treatment. Food Sci. Technol. Int. 2007;13(2):141-151.
http://dx.doi.org/10.1177/1082013207077914