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Abstract:

The objective of this study was to analyze the linear viscoelastic behavior of calcium impregnated apples by creep and sinusoidal tests and to correlate the changes in rheological parameters with some structure features. The effect of different Ca concentrations of impregnation solutions (0, 0.1 and 0.53%, w/w), system pressure (vacuum or atmospheric) and process time was studied. All samples showed a viscoelastic solid behavior with the storage modulus (G′) dominating the viscoelastic response. Treated apple samples with or without calcium showed a pronounced decrease in G′as compared with fresh tissue. Instantaneous compliance (J 0), decay compliances (J 1 and J 2) and fluidity significantly increased after treatments, while retardation times were approximately constant. Impregnation at high calcium concentrations provoked severe folding of walls and/or a general inner disruption of cells with plasmolysis and membrane breakage in a different way according to the pressure applied and the treatment time, explaining the viscoelastic behavior. Changes in compliances and storage modulus values were significantly lower for apples treated under vacuum than when the treatment was performed at atmospheric pressure, suggesting that vacuum impregnation is an effective methodology to fortify apple tissue avoiding serious damage in viscoelastic properties and presumably in texture. © 2009 Wiley Periodicals, Inc.

Registro:

Documento: Artículo
Título:Impact of calcium on viscoelastic properties of fortified apple tissue
Autor:Salvatori, D.M.; Doctorovich, R.S.; Alzamora, S.M.
Filiación:Departamento de Química, Facultad de Ingeniería, Universidad Nacional Del Comahue, Buenos Aires 1400, Argentina
Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Palabras clave:After-treatment; Apple tissue; Calcium concentration; Fresh tissues; Impregnation solution; Linear viscoelastic behaviors; Plasmolysis; Process time; Retardation time; Rheological parameter; Storage moduli; Structure features; System pressure; Treatment time; Vacuum impregnation; Viscoelastic behaviors; Viscoelastic properties; Viscoelastic response; Viscoelastic solids; Atmospheric pressure; Behavioral research; Elastic moduli; Fruits; Impregnation; Pressure effects; Tissue; Vacuum; Viscoelasticity; Calcium; Malus x domestica
Año:2011
Volumen:34
Número:5
Página de inicio:1639
Página de fin:1660
DOI: http://dx.doi.org/10.1111/j.1745-4530.2009.00550.x
Título revista:Journal of Food Process Engineering
Título revista abreviado:J Food Process Eng
ISSN:01458876
CODEN:JFPED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01458876_v34_n5_p1639_Salvatori

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Citas:

---------- APA ----------
Salvatori, D.M., Doctorovich, R.S. & Alzamora, S.M. (2011) . Impact of calcium on viscoelastic properties of fortified apple tissue. Journal of Food Process Engineering, 34(5), 1639-1660.
http://dx.doi.org/10.1111/j.1745-4530.2009.00550.x
---------- CHICAGO ----------
Salvatori, D.M., Doctorovich, R.S., Alzamora, S.M. "Impact of calcium on viscoelastic properties of fortified apple tissue" . Journal of Food Process Engineering 34, no. 5 (2011) : 1639-1660.
http://dx.doi.org/10.1111/j.1745-4530.2009.00550.x
---------- MLA ----------
Salvatori, D.M., Doctorovich, R.S., Alzamora, S.M. "Impact of calcium on viscoelastic properties of fortified apple tissue" . Journal of Food Process Engineering, vol. 34, no. 5, 2011, pp. 1639-1660.
http://dx.doi.org/10.1111/j.1745-4530.2009.00550.x
---------- VANCOUVER ----------
Salvatori, D.M., Doctorovich, R.S., Alzamora, S.M. Impact of calcium on viscoelastic properties of fortified apple tissue. J Food Process Eng. 2011;34(5):1639-1660.
http://dx.doi.org/10.1111/j.1745-4530.2009.00550.x