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Abstract:

Differential scanning calorimetry (DSC) was used to determine the onset and end temperatures of the glass transition (T(g)) for white bread equilibrated between 53 and 84% rh. Calorimetric T(g) end values were ≃20°C higher than onset values, indicating that it is probably more correct to refer to a 'glass transition range' rather than a glass transition temperature. Slices of white bread inoculated with a mixture of xerophilic molds were equilibrated to 75% rh (equilibrium moisture content of 14.5 g of water/100 g of dry material) and stored at 26°C. In a parallel experiment, some of the equilibrated bread samples were stored without mold inoculation and subjected to spontaneous contamination from the immediate surroundings. As suggested by measured T(g), bread stored at 75% rh and 26°C appeared to be glassy. After storage, samples of bread (inoculated or not) were spoiled by xexophilic molds, suggesting that T(g), as measured by DSC, cannot be considered as an absolute threshold for mold growth inhibition.

Registro:

Documento: Artículo
Título:Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state
Autor:Buera, M.P.; Jouppila, K.; Roos, Y.H.; Chirife, J.
Filiación:Departamento de Industrias, Fac. de Ciencias Exactas y Naturales, Ciudad Universitaria, (1428) Buenos Aires, Argentina
Department of Food Technology, University of Helsinki, PO Box 27 (Latokartanonkaari 7), FIN-00014, Helsinki, Finland
Año:1998
Volumen:75
Número:1
Página de inicio:64
Página de fin:69
DOI: http://dx.doi.org/10.1094/CCHEM.1998.75.1.64
Título revista:Cereal Chemistry
Título revista abreviado:Cereal Chem.
ISSN:00090352
CODEN:CECHA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00090352_v75_n1_p64_Buera

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Citas:

---------- APA ----------
Buera, M.P., Jouppila, K., Roos, Y.H. & Chirife, J. (1998) . Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state. Cereal Chemistry, 75(1), 64-69.
http://dx.doi.org/10.1094/CCHEM.1998.75.1.64
---------- CHICAGO ----------
Buera, M.P., Jouppila, K., Roos, Y.H., Chirife, J. "Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state" . Cereal Chemistry 75, no. 1 (1998) : 64-69.
http://dx.doi.org/10.1094/CCHEM.1998.75.1.64
---------- MLA ----------
Buera, M.P., Jouppila, K., Roos, Y.H., Chirife, J. "Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state" . Cereal Chemistry, vol. 75, no. 1, 1998, pp. 64-69.
http://dx.doi.org/10.1094/CCHEM.1998.75.1.64
---------- VANCOUVER ----------
Buera, M.P., Jouppila, K., Roos, Y.H., Chirife, J. Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state. Cereal Chem. 1998;75(1):64-69.
http://dx.doi.org/10.1094/CCHEM.1998.75.1.64