The effects of wheat sourdough on glutenin patterns, dough rheology and bread properties |
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Authors: | Duygu Gocmen Ozan Gurbuz Ay?egul Y?ld?r?m Kumral Adnan Fatih Dagdelen Ismet Sahin |
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Affiliation: | (1) Department of Food Engineering, Uludag University, Faculty of Agriculture, Bursa, 16059, Turkey;(2) Food Control and Research Institute, Republic of Turkey Agriculture and Rural Affairs, Hurriyet-Bursa, 16036, Turkey |
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Abstract: | Sourdough was prepared with cellular suspension containing 109 cfu of each strain mL−1 and incubated at 28 °C for 24 h and at 37 °C for 4 h. Two different sourdough levels (20 and 40%) were used in bread dough
preparation. The bread doughs were proofed at 30 °C and 85% relative humidity for 60/120/180 min. When glutenin changes that
occurred in samples 17, 18, 19, and 20 (40% SD 28) are compared with those that appeared in controls, it is obvious that,
the relative intensities of some of the protein bands slightly decreased and a few fainter protein bands appeared (which did
not exist in controls). A few fainter protein bands corresponding to the MM ≈ 25 kDa (high-mobility region) and the MM ≈ 66 kDa
(low-mobility region) were appeared in the same samples. In the samples prepared with 20% sourdoughs incubated at 28 or 37 °C,
the bands were still evident after 180 min of proof. This can be explained that glutenin fractions were not hydrolysed in
these applications due to the delay in pH drop. The use of 40% sourdough incubated at 28 °C for 24 h resulted in sticky doughs
and breads with lower volume, harder texture, unsatisfactory crumb grain and unpleasant flavour than the rest of the samples.
The use of sourdoughs incubated at 37 °C for 4 h caused positive effect on loaf volumes, specific loaf volumes and crumb structure. |
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Keywords: | Lactic starter Sourdough SDS-PAGE Glutenin |
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