2.2. Methods
2.2.1. Shelling/dehusking
A weighed sample (100 g) of paddy from each variety was
dehusked using the Laboratory Satake Sheller (Satake corporation
Tokyo, Japan) with rubber rolls adjusted to grain size so as to
minimize the breakage. The shelled rice and husk were weighed
separately for determining the yield of brown rice/dehusked rice.
2.2.2. Milling/polishing
The shelled rice (150 g) of each variety was subjected to milling/
polishing using a Mc-Gill miller for 2 min with a pressure of
88.85 kPa. It consists of a wire-mesh screen with slotted perforated
enclosure in which a shaft rubs the grain against the casing (frictional).
The bran is removed from the dehusked rice which passes
through these screens.
2.2.3. Broken rice
The milled rice produced is a mixture of head rice and brokens.
Grading of milled rice into different categories, such as small and
large brokens and head rice was determined manually using rectangular
perforated sheets with dimpled type holes of
diametere3 mm, 4 mm and 5 mm respectively. These perforated
sheets have been used to separate different sized brokens.