Abstract

Bread is one of the most important foods in industrial countries and it is at its best when consumed fresh. One of the major problems during storage of baked products is staling. Bread staling incorporates a combination of physical and chemical changes resulting in a decrease of bread quality. The predominant mechanism of staling is the time-dependent recrystallization of starch molecules. Avoiding this recrystallization is one of the most desired topics in science of bread technology but still not solved. Therefore, this study investigates a new possibility by trying to influence the recrystallization of starch with microwave heating. For this, the differences between microwave and conventional baked rye-wheat bread were examined concerning the difference of water activity and firmness of the bread during time. As result, a faster water loss during storage period could be observed in microwave heated bread, which probably implies an even more rapid recrystallization instead the desired avoiding of recrystallization of starch.

Keywords:

Bread, crystallization, firmness value, moisture migration, staling,

References

1. Bloksma, A.H. and W. Bushuk, 1988. Rheology and Chemistry of Dough. 3rd Edn., In: Pomeranz, Y. (Ed.), Wheat: Chemistry and Technology. AACC, St. Paul, 2: 131-217.
   Direct Link
2. Demirekler, P., G. Sumnu and S. Sahin, 2004. Optimization of bread baking in halogen lamp-microwave combination oven by response surface methodology. Eur. Food Res. Technol., 219(4): 341-347.
   CrossRef    Direct Link
3. Gray, J.A. and J.N. Bemiller, 2003. Bread staling: Molecular basis and control. Compr. Rev. Food Sci. F., 2(1): 1-21.
   CrossRef    Direct Link
4. He, H. and R.C. Hoseney, 1990. Changes in bread firmness and moisture during long-term storage. Cereal Chem., 67(6): 603-605.
   Direct Link
5. Hellmann, N.N., B. Fairchild and F.R. Senti, 1954. The bread staling problem. Molecular organization of starch upon aging of concentrated starch gels at various moisture levels. Cereal Chem., 31: 495.
   Direct Link
6. Katz, J.R., 1928. Gelatinization and Retrogradation of Starch in Relation to the Problem of Bread Staling. In: Walton, R.P. (Ed.), Comprehensive Survey of Starch Chemistry. Chemical Catalog Co., New York, pp: 100-117.
   Direct Link
7. Keskin, S.O., G. Sumnu and S. Sahin, 2004. Bread baking in halogen lamp-microwave combination oven. Food Res. Int., 37(5): 489-495.
   CrossRef    Direct Link
8. Ozkoc, S.O., G. Sumnu, S. Sahin and E. Turabi, 2009. Investigation of physicochemical properties of breads baked in microwave and infrared-microwave combination ovens during storage. Eur. Food Res. Technol., 228(6): 883-893.
   Direct Link
9. Palav, T. and K. Seetharaman, 2007. Impact of microwave heating on the physico-chemical properties of a starch-water model system. Carbohyd. Polym., 67(4): 596-604.
   CrossRef    Direct Link
10. Sablani, S.S., M. Marcotte, O.D. Baik and F. Castaigne, 1998. Modeling of simultaneous heat and water transport in the baking process. LWT-Food Sci. Technol., 31(3): 201-209.
    CrossRef    Direct Link
11. Schiraldi, A. and D. Fessas, 2001. Mechanism of Staling: An Overview. In: Chinachoti, P. and Y. Vodovotz (Eds.), Bread Staling. CRC Press, Boca Raton, FL, pp: 1-17.
    PMid:11310926    Direct Link
12. Ternes, W., 2008. Naturwissenschaftliche Grundlagen der Lebensmittelzubereitung. 3rd Edn., Behr’s Verlag, Hamburg, pp: 11.
    Direct Link
13. Zhang, J. and A.K. Datta, 2006. Mathematical modeling of bread baking process. J. Food Eng., 75(1): 78-89.
    CrossRef    Direct Link

Competing interests

The authors have no competing interests.

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