Novel approach to investigate the mechanical properties of crumb matrix during storage - Re-engineering of gas-free crumb pellets

PENGARUH KONSENTRASI MALTODEKSTRIN PADA ADONAN BEKU TINGGI PROTEIN TERHADAP KARAKTERISTIK ROTI

The maltodextrin in frozen dough functions as the cryoprotectant to keep the structure of dough and yeast viability during freezing. This study investigated the optimum maltodextrin concentration in the high-protein frozen dough to obtain the best characteristics of sweet bread. The experimental design was a simple, completely randomized design (CRD) with one factor, i.e., maltodextrin concentrations of 0, 1, and 2% w/w. The experiment was done in triplicates with 0% maltodextrin as the control. During ten days of frozen storage, it was found that the addition of maltodextrin significantly affected the number of viable yeast after freezing. Furthermore, the addition of 2% maltodextrin produces the best bread characteristics. Furthermore, the addition of maltodextrin to the frozen dough also protects the water content during proofing which was shown by loaf volume 85.80% and water content of 15.30%. Furthermore, yeast viability and the gluten content in bread profoundly impacted the optimum elasticity crumb firmness value 2.00 N/mm².

Impact of exogenous α-amylases on sugar formation in straight dough wheat bread

The use of bacterial or fungal α-amylases is common in wheat bread production to improve several quality-related parameters such as loaf volume, crust color or staling behavior. To study the impact of exogenous α-amylases on straight dough wheat bread, we quantitated mono-, di- and oligosaccharides and residual α-amylase activity in bread crumb during storage for up to 96 h. Discovery-driven proteomics of the five α-amylase preparations studied showed that only a few different amylases per preparation were responsible for the hydrolytic effect. Compared to the control, the supplementation with α-amylase from Bacillus amyloliquefaciens in wheat dough preparation led to major changes in the sugar composition of bread crumb during storage with the formation of oligosaccharides like maltopentaose, maltohexaose, maltoheptaose, and maltooctaose. A residual activity corresponding to 4.0% of the applied activity was determined in the breads prepared with α-amylase from B. amyloliquefaciens, but no residual activity was detected for any of the other fungal or bacterial α-amylases from Aspergillus oryzae or Thermoactinomyces vulgaris. Whether the detected residual activity is related to the characteristics of bread staling or bread crumb properties must be clarified in further studies.