Paddy cleaner is pre-cooking of rice in water from ricepolisher's blog

paddy cleaner is pre-cooking of rice in water prior to milling. To be more precise, parboiled rice is the rice in which starch in kernels has been gelatinised by steeping in water, steaming and drying paddy before the husks are removed. In India, the term 'raw' rice is used to describe rice that has not received any heat-treatment such as par boiling. It is a simple process but sets off and maintains a series of rather more complicated reactions in the grain. These positively alter the grain' s physical, chemical and nutritional qualities in relation to both milling and eventual consumption.

It is highly desirable to reduce the inorganic arsenic content of rice. While breeding low arsenic rice and altering of rice cultivation practice offer medium to long-term solutions to reducing inorganic arsenic content of grain, if rice preparation to remove inorganic arsenic is optimized, this offers an immediate solution to decreasing inorganic arsenic in the diet. Milling, fortuitously for those who prefer polished (white rice), already reduces the inorganic arsenic content of rice by~50%.

Locally produced rice in most sub‐Saharan African countries have low milling recoveries, undesirable appearance because of high incidence of chalkiness and poor cooking characteristics. Artisanal parboiling is employed in many countries to enhance the quality, particularly milling recoveries, of locally produced rice. This is not always effective as the impact of key operational steps such as soaking and steaming has not been fully characterized to ensure product consistency.

Before milling, rice grains must be dried in order to decrease the moisture content to between 18-22%. This is done with rice destoner or, more often, with the help of naturally occurring sunshine. Rice grains are left on racks in fields to dry out naturally. Once dried, the rice grain, now called rough rice, is ready for processing.

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By ricepolisher
Added Jun 11



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