Developing radio frequency technology for postharvest insect control in milled rice

Since methyl bromide fumigation has an adverse effect on human health and environment, it is urgently needed for developing a non-chemical method to replace chemical fumigation for disinfesting milled rice. The purpose of this research was to study possible applications of radio frequency (RF) energy for disinfesting milled rice without affecting product quality. A pilot-scale, 27.12 MHz, 6 kW RF system was used to study RF heating uniformity and develop a treatment protocol for achieving 100% insect mortality and finally evaluating quality attributes in RF treated milled rice during storage. The results showed that the heating time needed only 4.3 min to heat the 3.9 kg milled rice from 25 °C to 50 °C using RF energy, but 480 min for milled rice to reach 48 °C using hot air at 50 °C. After comparing three selected electrode gaps, an appropriate gap of 11 cm was obtained to achieve the heating rate of 5.8 °C/min for further heating uniformity tests. An RF treatment protocol was finally developed to combine 1.0 kW RF power with a forced hot air heating at 50 °C, movement of the conveyor with the speed of 12.4 m/h, two mixings, and holding at 50 °C hot air for 5 min, followed by forced room air cooling through single-layer (2 cm thick) samples. There were no significant differences in quality parameters (moisture, protein, fat, starch, hardness, and color) between RF treatments and untreated controls during storage (P > 0.05). Therefore, RF treatments may provide a practical, effective and environmentally friendly method for disinfesting milled rice.

[1]  Shaojin Wang,et al.  Developing Postharvest Disinfestation Treatments for Legumes Using Radio Frequency Energy , 2010 .

[2]  Shaojin Wang,et al.  Computer simulation model development and validation for radio frequency (RF) heating of dry food materials , 2011 .

[3]  José Miguel Aguilera,et al.  Image analysis of changes in surface color of chocolate , 2005 .

[4]  D. S. Sogi,et al.  Functional properties of rice bran protein concentrates , 2007 .

[5]  Shaojin Wang,et al.  Radio frequency disinfestation treatments for dried fruit: Model development and validation , 2014 .

[6]  R. Vidhyalakshmi,et al.  Brown Rice-Beyond the Color Reviving a Lost Health Food - A Review , 2009 .

[7]  Wei Chen,et al.  A study of the power absorption and temperature distribution during microwave reheating of instant rice , 2012 .

[8]  J. W. Armstrong,et al.  Insect Pests and Fresh Horticultural Products: Treatments and Responses , 1994 .

[9]  N. Hettiarachchy,et al.  Extraction, denaturation and hydrophobic properties of rice flour proteins , 2001 .

[10]  Shaojin Wang,et al.  Thermal death kinetics of adult Sitophilus oryzae and effects of heating rate on thermotolerance , 2014 .

[11]  L. Neven,et al.  Combined Heat and Controlled Atmosphere Quarantine Treatments for Control of Western Cherry Fruit Fly in Sweet Cherries , 2006 .

[12]  I. Saguy,et al.  Kinetics of Food Deterioration and Shelf-Life Prediction , 1997 .

[13]  Weilin Liu,et al.  Effect of microwave irradiation on composition, structure and properties of rice (Oryza sativa L.) with different milling degrees , 2013 .

[14]  Juming Tang,et al.  Tolerance of codling moth, and apple quality associated with low pressure/low temperature treatments , 2013 .

[15]  P. Follett.  Effect of Irradiation on Mexican Leafroller (Lepidoptera: Tortricidae) Development and Reproduction , 2008, Journal of economic entomology.

[16]  Zhongli Pan,et al.  APPLICATION OF RADIOFREQUENCY POWER FOR NON-CHEMICAL DISINFESTATION OF ROUGH RICE WITH FULL RETENTION OF QUALITY ATTRIBUTES , 2007 .

[17]  Si-ming Zhao,et al.  A thermal lethal model of rice weevils subjected to microwave irradiation , 2007 .

[18]  Shaojin Wang,et al.  High-temperature-short-time thermal quarantine methods , 2000 .

[19]  Shaojin Wang,et al.  Industrial-scale radio frequency treatments for insect control in walnuts: I: Heating uniformity and energy efficiency , 2007 .

[20]  Shaojin Wang,et al.  INDUSTRIAL-SCALE RADIO FREQUENCY TREATMENTS FOR INSECT CONTROL IN LENTILS , 2012 .

[21]  Stuart Helliwell,et al.  Ageing of Stored Rice: Changes in Chemical and Physical Attributes , 2002 .

[22]  Juming Tang,et al.  Effect of water-assisted radio frequency heat treatment on the quality of ‘Fuyu’ persimmons , 2008 .

[23]  S. Rajendran,et al.  Plant products as fumigants for stored-product insect control , 2008 .

[24]  Yu-Zhou Du,et al.  Thermal tolerance of Frankliniella occidentalis: Effects of temperature, exposure time, and gender , 2011 .

[25]  Shaojin Wang,et al.  Modeling fruit internal heating rates for hot air and hot water treatments , 2001 .

[26]  Juming Tang,et al.  Heating uniformity and differential heating of insects in almonds associated with radio frequency energy , 2013 .

[27]  H. Corke,et al.  Mapping quantitative trait loci for milling quality, protein content and color characteristics of rice using a recombinant inbred line population derived from an elite rice hybrid , 2001, Theoretical and Applied Genetics.

[28]  D. Jayas,et al.  An evaluation of insect expulsion from wheat samples by microwave treatment for disinfestation , 2015 .

[29]  Juming Tang,et al.  Radio frequency heating: a potential method for post-harvest pest control in nuts and dry products , 2004 .

[30]  J. Hansen,et al.  Evaluation of Radio Frequency–Hot Water Treatments for Postharvest Control of Codling Moth in `Bing' Sweet Cherries , 2005 .

[31]  Shaojin Wang,et al.  Development of thermal treatment protocol for disinfesting chestnuts using radio frequency energy , 2014 .

[32]  J. Hansen,et al.  Use of hot water treatment to control codling moths in harvested California 'Bing' sweet cherries , 2004 .

[33]  I. Díaz,et al.  Transgenic Expression of Trypsin Inhibitor CMe from Barley in Indica and Japonica Rice, Confers Resistance to the Rice Weevil Sitophilus Oryzae , 2003, Transgenic Research.

[34]  Zhou,et al.  Metabolic response of Platynota stultana pupae to controlled atmospheres and its relation to insect mortality response. , 2000, Journal of insect physiology.

[35]  Amilcar L. Antonio,et al.  Validation of Gamma and Electron Beam Irradiation as Alternative Conservation Technology for European Chestnuts , 2014, Food and Bioprocess Technology.

[36]  Willem Bouma.  Fourth meeting of the parties to the Montreal protocol , 1993 .

[37]  Hosahalli S. Ramaswamy,et al.  Inactivation of Escherichia coli K-12 and Listeria innocua in milk using radio frequency (RF) heating , 2005 .

[38]  F. Díaz‐Fleischer,et al.  Effect of Cold Storage on Larval and Adult Anastrepha ludens (Diptera: Tephritidae) Viability in Commercially Ripe, Artificially Infested Persea americana ‘Hass’ , 2010, Journal of economic entomology.

[39]  Shaojin Wang,et al.  Mathematical modelling of heating uniformity for in-shell walnuts subjected to radio frequency treatments with intermittent stirrings , 2005 .

[40]  J. Anderson,et al.  Storage of Cereal Grains and their Products , 2013 .

[41]  J. Meullenet,et al.  Sensory quality of cooked long-grain rice as affected by rough rice moisture content, storage temperature, and storage duration. , 2000 .

[42]  Bum-Keun Kim,et al.  Changes in physicochemical characteristics of rice during storage at different temperatures , 2012 .

[43]  J. Hansen.  Heating Curve Models of Quarantine Treatments Against Insect Pests , 1992 .

[44]  J. W. Armstrong,et al.  Hot-Water Immersion Quarantine Treatment Against Mediterranean Fruit Fly and Oriental Fruit Fly (Diptera: Tephritidae) Eggs and Larvae in Litchi and Longan Fruit Exported from Hawaii , 2007, Journal of economic entomology.

[45]  S. Wanga,et al.  Treatment design of radio frequency heating based on insect control and product quality , 2008 .

[46]  R. Goodhue,et al.  Effect of Steam and Solarization Treatments on Pest Control, Strawberry Yield, and Economic Returns Relative to Methyl Bromide Fumigation , 2012 .

[47]  Juming Tang,et al.  Quality of oranges as influenced by potential radio frequency heat treatments against mediterranean fruit flies , 2005 .

[48]  S. Wangc,et al.  Application of radio frequency treatments to control insects in in-shell walnuts , 2004 .

[49]  K. M. Kim,et al.  Improved Storage Stability of Brown Rice by Coating with Rice Bran Protein , 2004 .

[50]  Monika Sharma,et al.  Microwave technology for disinfestation of cereals and pulses: An overview , 2014, Journal of Food Science and Technology.

[51]  Shaojin Wang,et al.  Considerations in design of commercial radio frequency treatments for postharvest pest control in in-shell walnuts , 2006 .

[52]  Shaojin Wang,et al.  Process protocols based on radio frequency energy to control field and storage pests in in-shell walnuts , 2002 .

[53]  Shaojin Wang,et al.  Postharvest treatment to control codling moth in fresh apples using water assisted radio frequency heating , 2006 .

[54]  Shaojin Wang,et al.  Heating patterns of white bread loaf in combined radio frequency and hot air treatment , 2013 .

[55]  C. E. Curtis,et al.  Integration of nonchemical, postharvest treatments for control of navel orangeworm (Lepidoptera : Pyralidae) and Indianmeal moth (Lepidoptera : Pyralidae) in walnuts , 1998 .

[56]  David J. Geveke,et al.  Radio frequency electric fields inactivation of Escherichia coli in apple cider , 2008 .

[57]  Shaojin Wang,et al.  Industrial-scale radio frequency treatments for insect control in walnuts II: Insect mortality and product quality , 2007 .

[58]  Shaojin Wang,et al.  Coffee Bean Heating Uniformity and Quality as Influenced by Radio Frequency Treatments for Postharvest Disinfestations , 2012 .

[59]  Shaojin Wang,et al.  Almond quality as influenced by radio frequency heat treatments for disinfestation , 2010 .