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 was passed through a CQ20 screen and evenly blended white flour according to its original proportions to get
whole wheat flour.