|
KMID : 1024420110150040404
|
|
Food Engineering Progress
2011 Volume.15 No. 4 p.404 ~ p.412
|
|
|
Physicochemical Properties of Extruded Rice Flours and a Wheat Flour Substitute for Cookie Application
|
|
We Gyoung-Jin
Lee In-Ae
Kang Tae-Young
Min Joo-Hong
Kang Wie-Soo
Ko Sang-Hoon
|
|
|
Abstract
|
|
|
|
The purpose of this study is to prepare extruded rice flours suitable for baking rice cookies. The extruded rice flours were prepared at 100 and 130oC temperature and 25 and 27% moisture content in a co-rotating twin screw extruder. The rice extrudates were dried at 100oC for 18 hr and subsequently ground into the fine flour. Characteristics of the extruded rice flours were examined by rapid visco analysis, hydration property analysis, differential scanning calorimetry (DSC), and in vitro digestion test. Water absorption, solubility, and swelling power of all extruded rice flours were higher than those of native rice flour. DSC analysis showed that native rice flour had a peak at about 65oC while all extruded rice flours did not show any peaks since they were already gelatinized during the extrusion process. Viscosity of the extruded rice flours decreased with increasing temperature and lowering moisture content in the extrusion process. The extruded rice flours prepared at 130oC exhibited lower viscosity than those prepared at 100oC. The operating temperature of the extrusion process was critical for the starch digestion in vitro. The extruded rice flours prepared at 130oC showed a rapid decrease in digestible starch content while an increased level of slowly digestible starch content was observed compared to those treated at 100oC in the extruder. Cookies were prepared with a mixture of wheat flour and extruded rice flours at the ratio of 7 to 3. The cookies made with the extruded rice flours had lower spread factor and darker yellow color than those prepared with wheat flour only. Hardness of the extruded rice flour-added cookies was similar to that of the wheat flour cookie whereas their overall acceptance was better. Therefore the rice cookies partially supplemented with extruded rice flours may have a potential as early childhood foods which require soft texture and allergy reduction.
|
|
|
KEYWORD
|
|
|
rice flour, extrusion process, gluten-free cookie, in vitro digestion
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|