Abstract
The use of gluten-free products is increasing since an increasing number of people (1–2 %) are suffering from Celiac disease and thereby need a gluten-free diet. Gluten-free bread tends to have shorter shelf life and quality compared with white wheat bread. In this study, 3 % (flour basis) of pre-gelatinized oat and barley flour as well as an emulsifier were added to a gluten-free mix to increase the water content by 1.5–2 %, affect the starch retrogradation and the formation of amylose lipid complex. The staling was followed measuring the firmness (texture analyzer), water content and distribution (nuclear magnetic resonance), amylopectin retrogradation and the formation of amylose–lipid complex (differential scanning calorimetry) in order to see the impact of both macroscopic and molecular changes on firmness. Both gluten-free bread and a white wheat bread were used as control loaves. Largest specific volume was found in the gluten-free control. The firmness varied with both the specific volume and the point of measurement. The amount of retrograded amylopectin increased the firmness, although this effect was dependent on the type of bread, in terms of distribution and availability of the water within the system. The proton relaxation time, which was representing movable water, decreased during storage and revealed that both the amylopectin retrogradation and the lipid complex formation were affecting the rigidity of the amorphous domain and not only the crystalline regions. In contrast to the other recipes, the use of emulsifier caused limited retrogradation and a low correlation between the texture properties and time-dependent events.
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Acknowledgments
The authors wish to thank Val Street for performing the DSC-measurements and Imad Farhat for all the valuable help with the interpretation of the NMR results. Financial support was obtained from the Marie Curie Foundation, Sparbanksstiftelsen Färs & Frosta and Formas.
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Purhagen, J.K., Sjöö, M.E. & Eliasson, AC. The anti-staling effect of pre-gelatinized flour and emulsifier in gluten-free bread. Eur Food Res Technol 235, 265–276 (2012). https://doi.org/10.1007/s00217-012-1753-4
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DOI: https://doi.org/10.1007/s00217-012-1753-4