Brown rice was abrasively milled (0–100 s) to obtain rice
with various DOM (0–25%). Fig. 1 shows DOM as a function
of milling time. An increase in milling time did not
result in a linear increase in DOM. There was a change
in the rate constant (slope) during the milling process.
The slope decreased with milling time from 0 to 15
(DOM of ca. 9%). Milling times of at least 15 s
(DOM > 9%) resulted in a constant (lower) slope and a linear
relationship between DOM and milling time (r = 0.99).
The transition at a DOM of ca. 9% was probably related to
a significant difference in hardness between bran and endosperm