Feasibility of simultaneous rough rice drying and disinfestations by infrared radiation heating and rice milling quality

The objective of this study was to investigate the drying characteristics, milling quality, and effectiveness of disinfestation of rough rice under conditions of infrared (IR) radiation heating. Freshly harvested medium grain rice (M202) samples with low (20.6%) and high (25.0%) moisture contents (MCs) were used for this study. Single-layer rough rice samples [non-infested and infested with the adults and eggs of lesser grain borers (Rhizopertha dominica) and angoumois grain moths (Sitotroga cerealella)] were heated for various durations using a catalytic IR emitter. The effects of the tempering treatment and natural and forced air cooling methods on moisture removal, milling quality and disinfestation were determined. A high heating rate and corresponding high moisture removal were achieved by using IR heating. After heating, tempering increased moisture removal during cooling and improved the milling quality of the rice samples. When 20.6% MC rice was heated by IR for 60 s, the results were a rice temperature of 61.2 C, 1.7% MC removal during the heating period, and an additional 1.4% MC removal after tempering and natural cooling. In addition, the rice had 1.9% points higher head rice yield than a control sample dried with room air. The heating and tempering treatment also completely killed the tested insects. We concluded that simultaneous drying and disinfestation with high rice milling quality can be achieved by using a catalytic IR emitter to heat rough rice to 60 C, followed by tempering and slow cooling. 2007 Elsevier Ltd. All rights reserved.

[1]  Bienvenido O. Juliano,et al.  Rice : chemistry and technology , 1985 .

[2]  C. I. Nindo,et al.  Test Model for Studying Sun Drying of Rough Rice Using Far-Infrared Radiation , 1995 .

[3]  R. Kirkpatrick.  Infrared radiation for control of lesser grain borers and rice weevils in bulk wheat , 1975 .

[4]  Joos Vandewalle,et al.  Control applications in post-harvest and processing technology : CAPPT '95 : a postprint volume from the 1st IFAC/CIGR/EURAGENG/ISHS Workshop, Ostend, Belgium, 1-2 June 1995 , 1995 .

[5]  W. E. Muir,et al.  Stored-grain ecosystems. , 1995 .

[6]  M. Nakajima,et al.  Drying of Potato by Far Infrared Radiation , 1988 .

[7]  Terry J. Siebenmorgen,et al.  GLASS TRANSITION TEMPERATURE OF RICE KERNELS DETERMINED BY DYNAMIC MECHANICAL THERMAL ANALYSIS , 2004 .

[8]  T. Ban,et al.  Rice Cracking in High Rate Drying , 1971 .

[9]  T. Abe,et al.  MODELING FAR INFRARED DRYING OF ROUGH RICE , 1997 .

[10]  H. Schroeder.  Infra-red drying of rough rice. 2. Short-grain type. Calrose and Caloro. , 1960 .

[11]  Satish Bal,et al.  Drying performance of a batch type vibration aided infrared dryer , 2004 .

[12]  Terry J. Siebenmorgen,et al.  Rice fissuring response to high drying and tempering temperatures , 2003 .

[13]  R. C. Verma,et al.  Thin-layer infrared radiation drying of onion slices , 2005 .

[14]  T. Afzal,et al.  Heat and mass transfer characteristics of barley during FIR drying , 1998 .

[15]  E. A. Arinze,et al.  Determination of Solar Energy Absorption and Thermal Radiative Properties of some Agricultural Products , 1987 .

[16]  S. Das,et al.  Determination of the mixing index of paddy grains under vibrating conditions , 2003 .

[17]  Terry J. Siebenmorgen,et al.  The glass transition temperature concept in rice drying and tempering : Effect on milling quality , 2000 .

[18]  Bhadriraju Subramanyam,et al.  Integrated Management of Insects in Stored Products , 2018 .

[19]  E. W. Tilton,et al.  Some Effects of Infrared Irradiation on the Mortality of Immature Insects in Kernels of Rough Rice , 1963 .

[20]  O. R. Kunze,et al.  Fissuring of the Rice Grain After Heated Air Drying , 1979 .

[21]  Terry J. Siebenmorgen,et al.  Glassy state transition and rice drying: development of a brown rice state diagram. , 2000 .

[22]  K. Zhu,et al.  Heat and mass transfer of seed drying in a two‐pass infrared radiation vibrated bed , 2002 .

[23]  A. S. Ginzburg.  Application of infra-red radiation in food processing , 1969 .

[24]  Satish Bal,et al.  Specific energy and quality aspects of infrared (IR) dried parboiled rice , 2004 .