Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state
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...
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todo:paper_00090352_v75_n1_p64_Buera2023-10-03T14:07:57Z Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state Buera, M.P. Jouppila, K. Roos, Y.H. Chirife, J. 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. Fil:Buera, M.P. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00090352_v75_n1_p64_Buera |
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Universidad de Buenos Aires |
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I-28 |
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R-134 |
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
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. |
| format |
JOUR |
| author |
Buera, M.P. Jouppila, K. Roos, Y.H. Chirife, J. |
| spellingShingle |
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 |
| author_facet |
Buera, M.P. Jouppila, K. Roos, Y.H. Chirife, J. |
| author_sort |
Buera, M.P. |
| title |
Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| title_short |
Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| title_full |
Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| title_fullStr |
Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| title_full_unstemmed |
Differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| title_sort |
differential scanning calorimetry glass transition temperatures of white bread and mold growth in the putative glassy state |
| url |
http://hdl.handle.net/20.500.12110/paper_00090352_v75_n1_p64_Buera |
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