DEHULLING STUDIES OF KODO MILLET AND STORAGE OF MILLED KODO MILLET RICE
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Date
2015-08-20
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Engineering properties like longitudinal and lateral diameters, shape, 1000 grain
weight, bulk and true densities, porosity, angle of repose, coefficient of friction on
different surfaces (glass, mild steel, wood) and terminal velocity of kodo millet, its rice
and husk were measured. Four different dehulling equipments namely, burr mill, Victor
millet mill model-I, Victor millet mill model-II and rubber roll sheller were tested for
dehulling raw kodo millet by varying initial moisture levels of millet (9.0 to 10.1%).
Among the four tested equipments, Victor millet mill model-II was found to be best for
dehulling kodo millet with better dehusking efficiency (82.46 – 85.60%), milling
recovery (57.05 – 57.71%), head yield (87.62 - 89.46%) and lower rice breakage (10.52–
12.37%). For polishing dehulled kodo rice, AVM Abrasive polisher was found to be
suitable. Among various hydrothermal pretreatments attempted on kodo millet, soaking
either in room temperature water for 24 h or in hot water (75°C for 3½ h) followed by
steaming @1 kg/cm2 pressure for 15 min resulted in higher dehulling efficiency, head
rice yield and milling recovery with least rice breakage. Storage study of unpolished and
polished (@ 4 and 8% levels) kodo rice samples was done at ambient conditions for 60
days using different packaging materials such as polypropylene (300 gauge), stainless
steel container, spun bound nonwoven bag and HDPE woven bag. Nutritional and
cooking quality analyses of stored millet rice indicated that with storage, swelling index
and cooking time increased but solid loss decreased. The cost of processing kodo millet
into polished rice was Rs 1.65 per kg and the Cost: Benefit Ratio of processing was 1:1.88.
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