Optimization of Polishing Conditions for Long Grain <Emphasis Type="Italic">Basmati</Emphasis> Rice in a Laboratory Abrasive Mill |
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Authors: | Debabandya Mohapatra Satish Bal |
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Affiliation: | (1) Department of Post Harvest Engineering & Technology, Faculty of Food Processing Technology, Anand Agricultural University, Anand, 388110, India;(2) Department of Agricultural and Food Engineering, Indian Institute of Technology, Kharagpur, 721 302, India |
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Abstract: | Rice milling operation is a very energy-intensive process. The major qualities of the rice which are taken into consideration
while milling are the degree of milling and head rice yield. A laboratory abrasion polisher, modified by attaching a humidifying
and cooling unit, was used to polish long-grain Pusa Basmati rice in order to optimize the polishing conditions. Polishing experiments were carried out using central composite design
for a factorial with a central point, at different initial grain temperatures (5–25 °C) and milling chamber temperatures (11–25 °C)
at a constant humidity level of 95 ± 2% for different time intervals. Models capable of predicting the quality of milled rice
were developed using response surface methodology and used to determine optimum processing conditions. Responses such as degree
of milling (DOM), broken content, and specific energy consumption were used to assess product quality. Optimum milling conditions
of a minimum of 10% DOM, a broken content of 8%, and a specific energy consumption of 11 kJ/DOM were obtained at a milling
chamber temperature of 11 °C, an initial grain temperature of 15 °C, and a milling period of 180 s. |
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