Influence of Moisture Content, Variety and Parboiling on Milling Quality of Rice Grains

Abstract The effects of moisture content (8%, 10% and 12%), variety (Tarom and Fajr) and parboiling on milling quality of rice as a function of milling recovery (MR), head rice yield (HRY), degree of milling (DOM) and whiteness were investigated. The parboiled grains was prepared with three soaking temperatures of 25 °C, 50 °C and 75 °C and three steaming times of 10, 15 and 20 min. As a result of parboiling, the increasing rates of MR and HRY values were 7.8% and 14.3% for Tarom and 9.8% and 10.0% for Fajr, respectively, and the decreasing rates for DOM and whiteness were 6.6% and 10.8% for Tarom and 6.8% and 10.5% for Fajr, respectively. Moreover, decreasing moisture content to 8% maximized MR (75.8% for Tarom and 74.3% for Fajr) and HRY (65.8% for Tarom and 57.0% for Fajr) while increasing that to 12% revealed maximum values of DOM (6.1% for Tarom and 6.2% for Fajr) and whiteness (24.8% for Tarom and 28.2% for Fajr).

[1]  Francis Courtois,et al.  Assessing Breakage and Cracks of Parboiled Rice Kernels by Image Analysis Techniques , 2010 .

[2]  Narpinder Singh,et al.  EFFECT OF MILLING VARIABLES ON THE DEGREE OF MILLING OF UNPARBOILED AND PARBOILED RICE , 2002 .

[3]  S. Sulochana,et al.  Parboiling of paddy using thermic fluid , 1996 .

[4]  L. A. Pinto,et al.  Migration of mycotoxins into rice starchy endosperm during the parboiling process. , 2009 .

[5]  N. Ali,et al.  Basic concept of parboiling of paddy , 1974 .

[6]  J. Delcour,et al.  Impact of parboiling conditions on Maillard precursors and indicators in long-grain rice cultivars. , 2008, Food chemistry.

[7]  K. Gravois.  Optimizing selection for rough rice yield, head rice, and total milled rice , 1998, Euphytica.

[8]  Bin Li,et al.  Comparison of color techniques to measure the color of parboiled rice , 2009 .

[9]  Ali Zomorodian,et al.  A Study of the Effect of Solar Drying System on Rice Quality , 2009 .

[10]  T. Siebenmorgen,et al.  Evaluation of the McGill No. 2 rice Miller , 1992 .

[11]  T. Siebenmorgen,et al.  Milling characteristics of various rough rice kernel thickness fractions , 1993 .

[12]  An Improved Method for the Production of White Rice with Embryo in a Vertical Mill , 2005 .

[13]  B. K. Yadav,et al.  Changes in head rice yield and whiteness during milling of rough rice (Oryza sativa L.) , 2008 .

[14]  Terry J. Siebenmorgen,et al.  Low-temperature, low-relative humidity drying of rough rice , 2010 .

[15]  T. Siebenmorgen,et al.  Digital image analysis method for rapid measurement of rice degree of milling , 1998 .

[16]  S. Razavi,et al.  Effect of hulling and milling on the physical properties of rice grains , 2008 .

[17]  Kunlun Liu,et al.  Relationships between physical properties of brown rice and degree of milling and loss of selenium. , 2009 .

[18]  P. Vírseda,et al.  Influence of handling and processing of rough rice on fissures and head rice yields , 2006 .

[19]  Terry J. Siebenmorgen,et al.  Head rice yield reduction rates caused by moisture sorption. , 1990 .

[20]  S. Bhattacharya.  Kinetics on colour changes in rice due to parboiling , 1996 .

[21]  D. Mohapatra,et al.  Effect of degree of milling on specific energy consumption, optical measurements and cooking quality of rice , 2007 .

[22]  Zhongli Pan,et al.  Relationship between rice sample milling conditions and milling quality , 2007 .

[23]  J. D. Reid,et al.  Factors affecting the slope of head rice yield vs. degree of milling , 1998 .

[24]  Zhongli Pan,et al.  EFFECT OF COOLING METHODS AND MILLING PROCEDURES ON THE APPRAISAL OF RICE MILLING QUALITY , 2005 .

[25]  B. S. Sridhar,et al.  Hydration Kinetics and Energy Analysis of parboiling Indica Paddy , 2003 .

[26]  M. Miah,et al.  Parboiling of rice. Part I: Effect of hot soaking time on quality of milled rice , 2002 .

[27]  A. Nathakaranakule,et al.  Parboiling brown rice using super heated steam fluidization technique , 2006 .

[28]  N. Meeso,et al.  Effect of Soaking Temperature on Physical, Chemical and Cooking Properties of Parboiled Fragrant Rice , 2008 .

[29]  P. Imoudu,et al.  The effect of sun-drying on milling yield and quality of rice , 2000 .

[30]  M. H. Komarizadeh,et al.  Effects of crop-machine variables on paddy grain damage during handling with an inclined screw auger , 2010 .