Title of article :
Structural and rheological characterisation of heteropolysaccharides produced by lactic acid bacteria in wheat and sorghum sourdough Original Research Article
Author/Authors :
Sandra Galle، نويسنده , , Clarissa Schwab، نويسنده , , Elke K. Arendt، نويسنده , , Michael G. G?nzle، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2011
Pages :
7
From page :
547
To page :
553
Abstract :
Hydrocolloids improve the volume, texture, and shelf life of bread. Exopolysaccharides (EPS) produced by lactic acid bacteria (LAB) during sourdough fermentation can replace hydrocolloids. It was the aim of this study to determine whether heteropolysaccharides (HePS) synthesized intracellularly from sugar nucleotides by glycosyltransferases are produced in wheat and gluten-free sorghum sourdough at effective levels. The HePS-producing strains Lactobacillus casei FUA3185, L. casei FUA3186, and Lactobacillus buchneri FUA3154 were used; Weissella cibaria 10M producing no EPS in the absence of sucrose served as control strain. Cell suspensions of L. buchneri in MRS showed the highest viscosity at low shear rate. Glycosyltransferase genes responsible of HePS formation in LAB were expressed in sorghum and wheat sourdough. However, only HePS produced by L. buchneri influenced the rheological properties of sorghum sourdoughs but not of wheat sourdoughs. Sorghum sourdough fermented with L. buchneri exhibited a low |G∗| compared to the control, indicating a decrease in resistance to deformation. An increase in tan δ indicated decreased elasticity.
Keywords :
Heteropolysaccharides , Sourdough , Gluten-free , Lactobacillus buchneri
Journal title :
Food Microbiology
Serial Year :
2011
Journal title :
Food Microbiology
Record number :
1186252
Link To Document :
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