the effects of guar in combination with microbial transglutaminase on the guality parameters of gluten-free based on rice flour were investigated lncorporation of guar gum signiticantly increased specific volume leading to lower crumb hardness on the baking day compared with control addition of gase caused appropriate crumb texture and increase in tgase containing yielded higher crumb hardnes fomula containing 30 gkg of guar gum and 1ug tgase was the best formulae compared to all the others