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Abstract:

The physicochemical characteristics and functional properties of butternut (Cucumis moschata Duch. ex Poiret) and beetroot (Beta vulgaris L. var. conditiva) pectins obtained by enzymatic extraction from by-products of vegetable processing have been evaluated. The molecular mass distribution was determined using Gel Permeation Chromatography using light scattering, refractive index and UV detectors and the samples were found to be highly heterogeneous and polydisperse. Mw values of 136,000 and 1,309,000 g/mol were determined for butternut and beetroot pectins respectively. Butternut pectin had a high degree of methyl esterification. In the presence of high concentrations of sugar and at low pH, this pectin did not form gels but instead produced viscous solutions. Solutions showed pseudoplastic flow behaviour with a shear thinning index of 0.68 as determined from the Power law model. Beetroot pectin had a low degree of methyl esterification and formed gels with addition of Ca2+ at concentrations of 10 mg/g pectin or higher. The maximum value of the storage modulus was obtained at a Ca2+/GalA ratio of 0.25. The thermal stability of gels suggested that hydrogen bond interactions prevailed in the absence of Ca2+, whereas electrostatic junction zones increasingly developed between pectin chains as the calcium concentration increased. Aqueous solutions of butternut and beetroot pectins significantly reduced surface tension and both samples were able to form stable oil-in-water emulsions. It was found that protein and/or polyphenol - rich fractions present in the pectins adsorbed at the oil-water interface and were responsible for the emulsification properties. © 2012 Elsevier Ltd.

Registro:

Documento: Artículo
Título:Butternut and beetroot pectins: Characterization and functional properties
Autor:Fissore, E.N.; Rojas, A.M.; Gerschenson, L.N.; Williams, P.A.
Filiación:Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, (1428) Buenos Aires, Argentina
National Scientific and Technical Research Council of Argentina (CONICET), Argentina
Centre for Water Soluble Polymers, Glyndwr University Wrexham, Plas Coch, Mold Road, Wrexham, Wales LL11 2AW, United Kingdom
Palabras clave:Beetroot pectin; Butternut pectin; Functional properties; Beta vulgaris; Beta vulgaris subsp. vulgaris; Cucumis; Juglans cinerea
Año:2013
Volumen:31
Número:2
Página de inicio:172
Página de fin:182
DOI: http://dx.doi.org/10.1016/j.foodhyd.2012.10.012
Título revista:Food Hydrocolloids
Título revista abreviado:Food Hydrocolloids
ISSN:0268005X
CODEN:FOHYE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0268005X_v31_n2_p172_Fissore

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Citas:

---------- APA ----------
Fissore, E.N., Rojas, A.M., Gerschenson, L.N. & Williams, P.A. (2013) . Butternut and beetroot pectins: Characterization and functional properties. Food Hydrocolloids, 31(2), 172-182.
http://dx.doi.org/10.1016/j.foodhyd.2012.10.012
---------- CHICAGO ----------
Fissore, E.N., Rojas, A.M., Gerschenson, L.N., Williams, P.A. "Butternut and beetroot pectins: Characterization and functional properties" . Food Hydrocolloids 31, no. 2 (2013) : 172-182.
http://dx.doi.org/10.1016/j.foodhyd.2012.10.012
---------- MLA ----------
Fissore, E.N., Rojas, A.M., Gerschenson, L.N., Williams, P.A. "Butternut and beetroot pectins: Characterization and functional properties" . Food Hydrocolloids, vol. 31, no. 2, 2013, pp. 172-182.
http://dx.doi.org/10.1016/j.foodhyd.2012.10.012
---------- VANCOUVER ----------
Fissore, E.N., Rojas, A.M., Gerschenson, L.N., Williams, P.A. Butternut and beetroot pectins: Characterization and functional properties. Food Hydrocolloids. 2013;31(2):172-182.
http://dx.doi.org/10.1016/j.foodhyd.2012.10.012