Effect of hydrocolloids such as guar gum (GG), arabic gum (AG), carrageenan (CG), locust bean gum (LBG),
xanthan gum (XN), hydroxypropyl methylcellulose (HPMC) and carboxymethylcellulose (CMC) at 0.5%
w/w level on rheological and quality parameters of puri from whole wheat flour was studied. Hydrocolloids
like CMC, XN and HPMC increased the water absorption of puri dough, while it decreased in all
other samples. The dough development time and mixing tolerance index values increased, while dough
stability did not get affected. On addition of hydrocolloid, there was a reduction in the pasting
temperature, while the peak viscosity, hot paste viscosity and cold paste viscosity values increased.
Hardness, cohesiveness and adhesiveness properties of the puri dough increased with the addition of
hydrocolloids. All the hydrocolloids used in general helped in retention of moisture in the puri and hence
remained softer and pliable, while there was a significant reduction in the oil content of puri samples
containing hydrocolloids. Among the different hydrocolloids used, addition of guar gum at 0.5% w/w
level led to puris having improved quality characteristics to a greater extent with respect to moisture
retention, lowering of oil content upon frying with softer and pliable texture and better keeping quality.
The mass transfer studies confirmed that the mass transfer co-efficient values for moisture loss and oil
uptake were lower in puris with guar gum than control.
2011 E