YAMAMOTO CO., LTD.

Grain property

In this case of white rice, there is also a fact that the quality of white rice may differs even items which can be shown in numerical value are same. This is caused by the factors of quality evaluation which can not be shown in numerical value. Therefore, the original standard grain and samples are given for evaluating the quality.

There are two types of grain property: 1) properties that are affected by the processing method and facilities, and 2) properties that are affected by the brown rice properties.
For example, the proportion of removed bran layer are shown in Figure-? and ?.

Proportion of removed bran layer
A proportion of bran layer which remains at the back portion of grain and vertical furrow on the surface of
the grain is generally indicated by “whitening degree”.
There is a close relation between the value of whitening degree and whiteness, a whiteness meter is used
for the measurement of whitening degree as Japan Rice Millers Association.

2) Proportion of remaining bran
A proportion of bran which remains on the grain. (Removed bran is considered as foreign matter.)

3) Remaining of embryo
Remaining of embryo is indicated by embryo shape remained on white rice and a percentage of grain
which has an embryo.
Calculation way of percentage of remained embryo is explained later.

4) Others
Other than items above, grain uniformity and mixture percentage of white-core grain and white-belly grain
are also included to items showing grain property.
Remark: There are two types of white rice: complete white rice and 70% whitened (milled) rice.
The bran layer of complete white rice is completely removed, and the bran layer of 70%
whitened rice is removed by 70%.