Production and Characterization of Sorghum Sourdough Bread Sequentially Fermented with Monascus purpureus and Lactiplantibacillus plantarum

This study explored the characteristics of Monascus-fermented sorghum sourdough bread (MSSB) that was prepared through sequential fermentation using Monascus purpureus LZSM06 and Lactiplantibacillus plantarum LZSR03. The findings revealed a remarkable accumulation of Monascus pigments in Monascus-fermented sorghum flour (MS), with Monacolin K and GABA reaching 34.73 mg/100 g and 29.91 mg/100 g, respectively. By incorporating MS with sourdough technology, MSSB presented an increased loaf volume, improved texture, and a burgundy color, which was more favorably accepted than the other three breads. Meanwhile, the total phenolic content, antioxidant activity, and GABA contents in MSSB were the highest (P < 0.05). Despite the slight off-flavor imparted by MS, the flavor complexity was enhanced in MSSB, particularly in terms of types and levels of alcohols, acids, and esters. These findings suggested that pre-fermentation with Monascus purpureus can improve baking characteristics, nutritional value, and overall sensory acceptance of sorghum sourdough bread, thus providing insights into innovation in this field.