The Impact of Flacourtia inermis Roxb (Tomi-Tomi) Sourdough Prepared Using Different Drying Techniques on the Physicochemical Attributes and Characteristics of Sourdough Bread

The study aimed to produce dried sourdough tomi-tomi (Flacourtia inermis Roxb) with 2 different drying methods: Cabinet-driying (CD) and freeze-driying (FD) and investigate the effect of the dried sourdough on the viability of lactic acid bacteria (LAB) and yeast. The tomi-tomi dried-sourdough samples were used in breads production to observe the impact on the bread properties. Satisfactory results were obtained with CD and FD dried sourdough, there was no significant reduction in viability of lactic acid bacteria (LAB), yeast and specific volume of the bread. Nevertheless, the CD and FD dried sourdough significantly reduced the cell density of the bread compared to control. The addition of tomi-tomi juice increased the LAB and yeast production. The result of CD and FD dried sourdough with rehydration may be used for bread-making without bakery’s yeast activator addition. HIGHLIGHTS Tomi-tomi fruit (Flacourtia inermis Roxb) has the potential to be a starter of sourdough as it has a higher substrate nutrition value and bears fruit year-round. Driying methods (freeze-drying and cabinet-drying) have a major influence on tomi-tomi sourdough properties (pH and number of viability LAB and yeast cells).sss Rehydration for dried sourdough starter affects cell recovery of LAB and yeast. Dried sourdough by cabinet drying improved the loaf volume and texture of bread. GRAPHICAL ABSTRACT