The impact of hydrothermal treatment of rice and corn flours on their potential as gluten free bakery
improvers was tested.
Hydrothermal treatment of flours was carried out by suspending flours inwater on
the basis of 5/1 (w/w) and heated until 65 C.
Corn or rice semolina supplemented by field bean semolina
in ratio of 2/1 (w/w) were used for obtaining protein enriched gluten free breads, where improversfunctionality was tested.
Two central composite designs involving water hydration levels (X1, X0
1) and the
level of hydrothermally treated rice or corn flours (X2, X0
2) were used. Instrumental analyses of breads
(specific volume, moisture content, crumb texture and height/width ratio) were carried out to assess the
impact of experimental factors. Results showed that hydrothermal treatment of rice or corn flours
affected in different extent the bread properties, increasing the specific volume of breads and H/W ratio,
and decreasing the hardness and chewiness of both types of breads.
The optimum formulation for rice/field bean bread contained 7.59 g/100 g treated rice flour and
96.66 g/100 g water, and for corn/field bean bread the optimum included 4.73 g/100 g treated corn and
78.81 g/100 g water. Optimized breads were found acceptable according to color and texture structure.
The impact of hydrothermal treatment of rice and corn flours on their potential as gluten free bakeryimprovers was tested. Hydrothermal treatment of flours was carried out by suspending flours inwater onthe basis of 5/1 (w/w) and heated until 65 C. Corn or rice semolina supplemented by field bean semolinain ratio of 2/1 (w/w) were used for obtaining protein enriched gluten free breads, where improversfunctionality was tested. Two central composite designs involving water hydration levels (X1, X01) and thelevel of hydrothermally treated rice or corn flours (X2, X02) were used. Instrumental analyses of breads(specific volume, moisture content, crumb texture and height/width ratio) were carried out to assess theimpact of experimental factors. Results showed that hydrothermal treatment of rice or corn floursaffected in different extent the bread properties, increasing the specific volume of breads and H/W ratio,and decreasing the hardness and chewiness of both types of breads.The optimum formulation for rice/field bean bread contained 7.59 g/100 g treated rice flour and96.66 g/100 g water, and for corn/field bean bread the optimum included 4.73 g/100 g treated corn and78.81 g/100 g water. Optimized breads were found acceptable according to color and texture structure.
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