Put in a vacuum, rice loses all the air it carries within. In a following warm water bath the nutrients become more soluble and move out of the bran.
To move these nutrients into the kernel, hot steam and air pressure are used, otherwise they would rinse out into the water.
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To move these nutrients and pigment hot steam and air pressure into the endosperm
Extraction of Anthocyanin less then process parboiled rice Color parameter in parboiled more than non parboiled