For extrudes bran recombining (EBR) process, the bran fraction
was passed through a 80 mesh sieve and tempered to
40 ± 2 g/100 g moisture content, stirred, evenly blended and rest
for 1 h. A co-rotating double screw extruder from Saixin (Ji'nan
Saixin Machinery Co., Ltd., Shandong, CN) was used. The screw
configuration was composed of conveying and mixing elements
with reverse elements in the last section of the barrel. The
extruder was operated at a feed rate of 25e30 kg h1
, screw
speed 120 r/min, mass temperature 150 C, The extruded samples
were collected and dried slowly in an oven at 60 C for 16 h. After
ground by a Perten LABORATORY MILL 3100, the collected bran
fraction was passed through a CQ20 screen and evenly blended
with white flour according to its original proportions to get
whole wheat flour.