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Formation and distribution of ice upon freezing of different formulations of wheat bread

Guo Chen (Institutionen för teknisk fysik, Kondenserade materiens fysik ; SuMo Biomaterials) ; Helén Jansson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; K. E. Lustrup ; Jan Swenson (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Cereal Science (0733-5210). Vol. 55 (2012), 3, p. 279-284.
[Artikel, refereegranskad vetenskaplig]

The formation and distribution of ice upon the freezing of fresh breadcrumb were investigated using differential scanning calorimetry. Three types of wheat bread containing different amounts of sugar and dietary fiber were measured. Various frozen states were produced through freezing with different cooling rates (0.5, 1, 2, 5, 10, 20 and 30 degrees C/min) to -30 degrees C; they were then analyzed and compared by thawing with the same heating rate (10 degrees C/min) to 20 degrees C. All DSC heating traces exhibited dual endotherms in the temperature range for the melting of ice: The major transition was attributed to the ice formed in the large crumb pores (gas cells) and the minor event, which preceded the major endotherm, was assigned primarily to the ice formed in the nanometer-sized pores within the gluten-starch matrix. The size of ice crystals in the two classes of pores was estimated using the modified Gibbs-Thompson relation. The distributions of ice in these pores depended on the bread compositions. It is concluded that the complex crumb porosity plays an essential role in shaping the activities of water and ice in the breadcrumb.

Nyckelord: Bread, Freezing, Ice, Crumb porosity, hydrated gluten networks, frozen dough, baked bread, structuring, proteins, thermoporometry, microscopy, storage, temperatures, architecture, calorimetry



Denna post skapades 2012-07-03. Senast ändrad 2016-04-06.
CPL Pubid: 159925

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)
SuMo Biomaterials

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Livsmedelsvetenskap

Chalmers infrastruktur