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Summary The purpose of this research was to improve the functional properties of gluten-free (GF) wholemeal buckwheat bread by sourdough fermentation and addition of arabinoxylan (AX) and pyranose 2-oxidase (POx). AXs are able to cross-link to other AX molecules under acidic conditions, which is supported by the addition of oxidizing enzymes (e.g., POx). On a first approach, the optimal sourdough concentration (% acidification of total flour weight) was adjusted. The best results were seen at an acidification of 82% of total flour weight. The optimal dosage of 3% AX and 1 nkat POx/g flour was able to increase the specific volume from 1.80 to 1.93 cm3/g bread and reduce the firmness from 9.61 to 4.69 N compared to the control bread and presented an acceptable relative elasticity of 62.20 ± 0.96%. These effects were then compared in breads produced from wholemeal and refined buckwheat flour. Interestingly, the wholemeal buckwheat bread showed a significantly lower firmness and higher relative elasticity than the bread from refined flour, which can be mainly attributed to the higher protein and dietary fibre content of wholemeal flour. Overall, this study suggested that addition of AX and POx could positively increase the quality of GF buckwheat bread.

Summary Cereals and legumes offer many nutritional benefits, and should therefore be consumed widely. In particular, legume consumption is very low in northern countries. Although many species of cereals, pseudocereals and legumes are available for human nutrition, today only a limited range of them is used in larger amounts. Wheat, rice and maize are dominating the cereal sector and beans, chickpeas and peas are the most produced legumes. Specialty cereals (e.g., colored varieties), pseudocereals (amaranth, quinoa, buckwheat) and legumes show great potential for the development of new food products due to their good nutritional composition and different functional properties.