Microwaving and Flours

September 23/Izmir, Turkey/Technology Business Journal -- According to recent research from Izmir, Turkey, "In this study, the effects of microwave application on technological and rheological properties of flours produced from sound and damaged wheat by suni-bug (Eurygaster spp.) were investigated. The flour samples were exposed to microwave energy in various times (90, 120, 180, 240, 300 seconds) by using a closed system at 625 W. Existing of suni-bug damage in flour samples was determined by modified Zeleny sedimentation test before microwave application."

"Total protein, the standard and modified Zeleny sedimentation test, wet gluten, standard and modified Perten gluten indexes, falling number, and alveographe test of the flour samples were carried out. The results were evaluated statistically and summarized as below (p <0.05). The moisture values (15.2-12.0%), wet gluten contents (28-20.4%), proteolytic activity (40.20-6.96%), zeleny sedimentation (31.8-15.8ml) and alveogram energy (W) values (192-92 10(-4) J) among samples decreased whereas Perten gluten index (78-100%) and falling number values (264-397 s) of flour samples increased with processing microwave times. The total protein content of samples was not affected significantly (p <0.05) by heating with microwave treatment," wrote H. Diraman and colleagues.

The researchers concluded, "These results suggested certain microwave treatment times (120-180 seconds) caused positive effects on thermal inactivation of insect enzyme damage of wheat according to some physicochemical quality parameters (Zeleny sedimentation, Perten Gluten index and alveogram values)."

Diraman and colleagues published their study in Food Science and Technology Research ("Effect of Microwaves on Technological and Rheological Properties of Suni-Bug (Eurygaster spp) Damaged and Undamaged Wheat Flour." Food Science and Technology Research, 2010;16(4):313-318).

For additional information, contact H. Diraman, Research Institute Olive Culture, Minist Agriculture & Rural Affairs, TR-35100 Izmir, Turkey.

From the October 4, 2010, Prepared Foods E-dition