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Effect of fermentation on content, molecule weight distribution and viscosity of β‐glucans in oat sourdough

Lu, Jun, Shan, Lingke, Xie, Yiting, Min, Fangfang, Gao, Jinyan, Guo, Laichun, Ren, Changzhong, Yuan, Juanli, Gilissen, Luud, Chen, Hongbing
International journal of food science & technology 2019 v.54 no.1 pp. 62-67
Lactobacillus plantarum, beta-glucans, fermentation, gluten-free bread, lactic acid bacteria, molecular weight, oats, sourdough, texture, viscosity
This study investigated the effect of fermentation on the physicochemical properties of β‐glucans in oat sourdough. Sourdoughs were produced from oat using homo‐fermentative lactic acid bacteria, Lactobacillus plantarum 22134. The contents of total β‐glucan and soluble β‐glucan, the molecular weight (MW) of β‐glucan and the viscosity of the extracted β‐glucans were determined at 0, 4, 8, 10 and 12 h of fermentation. The total β‐glucan content decreased from 4.89% to 4.23% after 12 h of fermentation. The soluble β‐glucan concentration increased from 1.89% to 2.18% and then decreased to 1.97% after 8 h of fermentation. The content of β‐glucans with MW > 10⁵ decreased from 0 to 4 h of fermentation, followed by an increase and then a decrease after 8 h. The oat sourdough fermented for 8 h had high viscosity, which could be more beneficial for health and bread texture quality, especially for gluten‐free breads.