abstract
Among dairyproducts,
Doogh,
atraditionalfermentedacidified drink,
hasspecialstatusin
Iran duetoitshealthproperties.However,themainphysicalproblemoftheproductisits
phase separation.Therefore,theaimofthisstudywastoproduceastableand fiberenriched
pasteurizedandnon-pasteurizedDooghusinggellan.PasteurizedDooghs
containing fiber andgellanwithconstantshearrateshadhighershearstressesand
apparent viscositiesthannon-pasteurizedsamples.Moreover,pasteurizationofthe
Dooghs ledtoanincreaseintheconsistencycoefficient andadecreaseinthe flow
behavior indexaswellasanincreaseintheplasticviscosityandyieldstress.Theheat-
treatment oftheDooghsresultedinamorepseudo-plasticbehavior.Thenewproducts
were stableduringstorage;however,about55%phaseseparationoccurredincontrol
samples. Additionof0.4%(w/w) fiber andgellanledtoanacceptableappearance,odor,
taste, off-flavor, consistencyandoverallacceptability