The particle size for whole wheat flour made from bran recombining
processes was obviously higher than those from whole grain
grinding processes (Fig. 2). Whole wheat flour made from UM had
the lowest values in particle size, with the D50 of 18.61, 19.36 and
15.92 mm for red wheat (Zhengmai 366), white wheat (Yumai 57)
and CWRS, respectively. Whole wheat flour made from EBR had the
highest values in particle size, with the D50 of 69.13, 57.96 and 59.22 mm for red wheat (Zhengmai 366), white wheat (Yumai 57)
and CWRS, respectively. D50 was positively and significantly correlated
with kernel hardness (p < 0.05). This might be due to higher
hardness of grain leading to its friability. For bran recombining
processes, D50 followed the order EBR > HTBR > HMBR > UMBR,
indicating that the HMBR and UMBR could reduce the particle size of
whole wheat to a greater degree compared to the EBR and HTBR
procedures. This might be due to aggregation of bran during
extrusion or heat treatment resulting in their larger particle size