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Apple pomace, a by-product that remains after extraction of juice from fruit, is a good source of dietary fibre, minerals and different phytochemicals such as phenolic acids. Although the valorization of apple pomace as a bakery ingredient was performed by several authors, there is a lack of information on attempts of incorporation of apple by-products in the form of coextrudates with corn grits (CAPCG). In this study, sponge cakes were created with apple pomace coextruded with corn grits in the ratio of 45:55 by partial replacing wheat flour with coextrudate in the formulation at 10%, 20% and 30% level. With the increase in the proportion of coextruded particles, the farinographic characteristics of dough samples showed an increase in water absorption and dough development time due to larger particles of coextrudates, and loss of dough elasticity. Consequently, the cake specific volume decreased over the range between 3.6 - 14.2%, but only the substitution level of 30% yielded an increase in cake firmness after 1 h of cooling and after 24 h of storage. The estimation of sponge cake sensory properties using the hedonic scale from 1 to 9 showed that the most acceptable texture was found in the control sample, whereas all sponge cakes with CAPCG had significantly higher acceptance of odour and taste in comparison to the control cake. From the nutritional point of view, sponge cakes substituted with CAPCG showed higher total dietary fibre content than the control wheat sponge cake.

This study aimed to determine the impact of ancient wheat varieties (emmer, spelt and khorasan) and spontaneous sourdough fermentation on the bioaccessibility of total phenolic content (TPC) and the DPPH antioxidant capacity evolution during breadmaking and in vitro digestion. Sourdough and yeast-fermented modern wheat breads were used as controls. After 6 h of fermentation, the total titrable acidity of the sourdough increased from 139 to 167%. The wheat variety, type of fermentation and processing affected TPC, antioxidant activity and bioaccessibility. Antioxidant activity and TPC were reduced by dough mixing, increased after sourdough fermentation and slightly decreased or remained the same after baking. Although wheat flour had the highest TPC, the modeling of TPC kinetic revealed that emmer and spelt sourdough exhibited a higher bound phenolics release rate due to the higher acidity, which contributed to increased phenolics solubility. Although wheat bread, both before and after digestion, had the lowest TPC, especially the one prepared with yeast, high TPC bioaccessibilities and antioxidant activities after the digestion suggested that, except phenolics, digestion process improved the release of additional compounds with different bioaccessibility and biological activity. The results of this study proved that the application of sourdough fermentation can increase the potential of ancient wheats in the developing of functional bakery products. [ABSTRACT FROM AUTHOR]

The aim of this study was to test the suitability of three different ancient wheat varieties (emmer, spelt and khorasan) to produce spontaneously fermented sourdough bread and to evaluate the impact on the dough rheological properties, ultrastructure and baking quality. Modern wheat sourdough bread and bakery yeast fermented bread were used as controls. Sourdoughs produced from modern and ancient wheats exerted different effects on dough viscoelastic properties, bread specific volume, texture, firming rate, colour and sensory properties, while there was no influence on bread water activity. Both khorasan sourdough, being characterised with the highest dough strength and dense gluten protein matrix, and emmer sourdough, with loose and thin gluten strands of low strength, yielded breads characterised by low specific volume and hard crumb texture. Spelt and modern wheat sourdough were characterised by foam-like dough structures with entrapped gas cells leading to breads of similar specific volume and texture. Although the yeast-fermented wheat flour exerted a higher specific volume and the lowest firmness, the sourdough wheat flour bread had a lower firming rate. A comparison of sourdough bread prepared with modern and ancient wheats revealed that breads based on ancient varieties possess a less noticeable sour taste, odour and flavour, thus contributing to more sensory-appealing sourdough bread. [ABSTRACT FROM AUTHOR]

A comparative evaluation of the rheological properties of ancient wheat flours (emmer, spelt, and khorasan), cultivated under the same conditions, was conducted. They were evaluated for chemical composition, wet gluten quantity, quality, aggregation, and disruption kinetics (GlutoPeak), dough proofing (Rheofermentometer), as well as mixing and thermal behavior (Mixolab). High wet gluten content of spelt flour led to formation of strong gluten network with the highest water absorption and maximum dough height during proofing in comparison to other varieties. Khorasan flour, although having very low wet gluten content, exhibited the highest dough stability both during mixing and fermentation due to high gluten index. Despite being characterized with high wet gluten, very low gluten index of emmer flour affected dough development process, resulting in the lowest dough height, and pronounced loss in dough height during fermentation as well as the lowest percentage of gas retained in the dough compared to other species. Novelty impact statement: The results obtained in this study can be used to better understand the techno‐functionality and target application in cereal based products of different ancient wheat species. Considering the obtained results, khorasan wholegrain flour can be the most suitable for bread‐making process requiring longer fermentation time, while emmer flour will exhibit better performance in short‐term fermentation. In general, making bread from ancient wheats will require modified baking techniques in order to satisfy the renewed consumers' demand for these products, while improving their bread‐making potential. [ABSTRACT FROM AUTHOR]

In this study changes during fermentation of spontaneously fermented modern and ancient (spelt, emmer, and khorasan) wheat sourdoughs and their feasibility to act as leavening agents in breadmaking were evaluated. During 6 h of fermentation, sourdough was characterized for lactic acid bacteria and yeasts counts, pH, total titratable acidity (TTA), proteolytic activity, rheological and electrophoretic profiles. The effects of 25 and 50 g/100g sourdough addition on physico-chemical and sensory properties of refined wheat flour bread were also investigated. Although in all sourdoughs a pH drop, increase in proteolytic activity, gliadin and glutenin degradation with fermentation were recorded, due to different flour composition and microbial activity, tested sourdoughs significantly differed in rheological properties and breadmaking quality. Wheat sourdough being characterized by the highest acidification, increase in proteolytic activity, and the most extensive hydrolysis of gliadins, resulted in bread with the lowest specific volume and hardest crumb texture. Emmer sourdough, having the highest TTA, ash and wet gluten content, exhibited the highest extensibility, the least pronounced changes in proteolytic activity and the electrophoretic pattern which produced bread with the highest volume and softest texture. In general, ancient wheat varieties have shown great potential in sourdough breadmaking in comparison to modern wheat. • Ancient wheat varieties were used to prepare spontaneously fermented sourdoughs. • Wheat, spelt, emmer and khorasan sourdough behaved differently during fermentation. • Wheat sourdough had increased proteolytic activity and high gliadins hydrolysis. • Emmer sourdough exhibited high extensibility and low changes in gluten structure. • Unlike wheat, emmer resulted in bread with the highest volume and softest texture. [ABSTRACT FROM AUTHOR]

Abstract: The main aim of this study was to determine the changes in free sulphydryl content during postharvest wheat and flour maturation. The content of free sulphydryl groups was determined from wet gluten over 50 days of wheat postharvest maturation and over 14 days of flour maturation by varying incubation temperatures (30 and 37 °C) and incubation times (0, 45, 90 and 135 min). The amount of free sulphydryl groups increased during postharvest wheat and flour maturation as well as with the increase in temperature and gluten incubation time. The additional aim of this study was to find the interrelation between the content of free sulphydryl groups and selected parameters of technological quality by means of Principal Component Analysis. During wheat/flour maturation, the strengthening of protein structure was observed manifested by the increase in gluten index and Mixolab protein network weakening (C2), and changes in dough resistance as well. The incubation temperature of 37 °C affected the weakening of protein structure manifested by the decrease in gluten index and resistance, and increase in extensibility. Strong differentiation of examined varieties in terms of selected quality indicators was observed upon pre-defined maturation period, probably due to the expression of their intrinsic properties. [Copyright &y& Elsevier]