the effect of xanthan hydrocolloid on improvement of physical and sensory properties of barbary dough and bread

the effect of xanthan hydrocolloid (0.1 and 0.5% w/w of flour) on physical and sensory properties of the fresh and stored barbary bread were studied. effects of hydrocolloids on physical properties of baked bread were determined by different tests of: penetration, colorimetry (hunter values) of crust and differential scanning colorimetry (dsc). sensory evaluation also was carried out for determining the overall acceptability of the bread samples. all the experiments, except colorimetry, were carried out on the first, second and fourth days after baking. with an addition of xanthan, physical and overall acceptability of the bread were improved. xanthan gum increased dough consistency, water absorption, dough developing time as well as the softening index. furthermore, it increased yellowness and lightness indexes of the crust and softness of the crumb in the bread experimental samples. the bread samples containing xanthan gum at 0.5% level showed the highest quality accompanied by the least unfavorable change during their storage time.