The shelf life of ohmically processed foods is comparable to that of canned and sterile, aseptically processed products. The advantages and limitations of this heating method, as well as its main current applications are also discussed. Electro-Magnetic equipment , , Sciencedirect, Web of science WikiSysop. Evaluation of key parameters during construction and operation of an ohmic heating apparatus. Ramaswamy Fruits and Vegetables Gary Tucker Commercially Successful Applications Gary Tucker Section 8 Other Applications and Future Uses of Ohmic Heating Ohmic Blanching Filiz Içier and Hayriye Bozkurt Ohmic Heating as Thawing and Tempering Technology Nadide Seyhun, Servet Gulum Sumnu, and Hosahalli S. Table of Contents Section 1 Basics of Ohmic Heating Overview of Ohmic Heating Sudhir K. The electrodes were examined comparatively using a 60 Hz sinusoidal alternating current.
Sarang, Romel Somavat, and Ken Ayotte Section 2 Electrical Conductivity Electrical Conductivity: Importance and Methods of Measurement Mohammad Reza Zareifard, Michele Marcotte, Hosahalli S. Use of ohmic heating for aseptic processing of food particulates. Ohmic processing is one of electrical heating methods, which is based on the passage of the electrical current through a product that serves as an electrical resistance Stirling, 1987; Halden et al. Int J Food Sci Tech. The flow of electric charge in a medium is known as electricity.
The primary property affecting ohmic heating is the electrical conductivity of the food Sastry and Palaniappan. In conventional and microwave heating electrodes are absent as well as in inductive heating in which magnetic nanoparticles are used. Less energy consumption for heating food to serving temperature, products in reusable pouches with long shelf life. Ohmic Heating in Food Processing covers several aspects of Ohmic heating: science and engineering, chemistry and physics, biochemistry and nutrition, quality and safety, and development and technology, both basic and applied. Some reports deal with ohmic heating and its comparison to the effects of conventional pasteurization. Product development considerations for ohmic processing. The controlling parameter is the electrical conductivity of the solid and liquid phases.
The shelf life of ohmically processed foods is comparable to that of canned and sterile, aseptically processed products. Ohmic heating — a review. Accelerated inactivation of Geobacillus stearothermophilus spores by ohmic heating. Main factors affecting the electrical conductivity were the temperature and the composition of the blends. To achieve such goals, alternative heating technologies have been developed, in the last decades, such as heating using microwave radiation, inductive heating and ohmic heating. It is referred to as joule heating, electrical resistance heating or electro conductive heating.
Design and performance evaluation of an ohmic heating unit for thermal processing of highly viscous liquids. Rice bran stabilization and rice bran oil extraction using ohmic heating. Developing of adequate safety and quality- assurance protocols in order to commercialization ohmic heating technology M. It is a novel technique which provides rapid and uniform heating, resulting in less thermal damage to the food product. The definition of the dissipated power is also dependent on the overall reactor impedance which can be tuned using different sizes of electrodes, or by changing the concentration of charged species in solution. Cylindrically shaped ground beef samples with different fat contents 2%, 9% and 15% were used as the test material being cooked.
Int J Hydrogen Energy 2010;35:4276—84. Changes may have been made to this work since it was submitted for publication. Electrical conductivity of fruits and meats during ohmic heating. If this problem is solved, a new method to thaw foods will be available. The temperature measurements during the infrared cooking of the semi-cooked cylindrical minced beef product koefte were taken by both contact thermocouples and non-contact thermal imaging techniques.
Considering some experimental evidence, such as the differences observed in the reaction time, yield and selectivity of some reactions in comparison with conventional and microwave heating, it is important to investigate the existence of specific electrochemical effects of ohmic heating due to the presence of the electrical perturbation in the reaction medium and to rationalize how these effects may interfere with the chemical reactions. Sastry Section 4 Ohmic Heating Behavior and Design Parameters Ohmic Heating Behavior of Foods Ricardo Simpson, Erica Carevic, Romina Grancelli, and Jorge Moreno Electrodes in Ohmic Heating Yetenayet Bekele Tola, Navneet Singh Rattan, and Hosahalli S. . Applications Advantages Food items References Sterilisation, heating liquid foods containing large particulates and heat sensitive liquids, aseptic processing Attractive appearance, firmness properties, pasteurisation of milk without protein denaturation Cauliflower florets, soups, stews, fruit slices in syrups and sauces, ready to cook meals containing particulates, milk, juices. Therefore additional research and development is needed in order to fully understand and validate this technology with respect to its performance and safety issues especially when applied to the heating of chemical reactions. Frequency and form of wave The common frequencies employed for ohmic heating of foods are 50 Hz and 60 Hz Kolbe et al. J Food Process Eng 1991;14:221—36.
Table 4 Comparison between ohmic heating with other heating methods. Table summarises the applications of ohmic heating and the advantages reported in literature. The simulation and also experimental trials show that the principal critical process factor in fluid jet ohmic heater was the fluid level and one can deduce its great impact on the thermal treatment. Farid, Wei Jian Kong, and Necati Ozkan Electrofreezing Marta Orlowska, Alain LeBail, and Michel Havet Section 9 Process Validation Validation of Ohmic Processing Systems Dilip I. This paper presents a comprehensive review of ohmic heating current application, design configurations and operation parameters.
Its use in organic synthesis, in the heating of chemical reactors, is an emerging method that shows great potential, the development of which has started recently. Past research as done by Lima et al. As a result, aseptically processed foods, which are cooked prior to packaging, are appearing in the shops. This ohmic heater is especially suitable for synthesis in aqueous media, where the reaction medium is electrically conductive as in the case of aqueous solutions of acids, bases or salts. The sample is held between the two electrodes and an insulator cap is also shown near the electrodes. An economic-engineering study of ohmic food processing.
Howell, Editors, Process Engineering in the Food Industry, Elsevier Applied Science, Amsterdam 1989 , pp. It was thought at that time that lethal effects could be attributed to electricity. Since ohmic heating does not depend on heat transfer to the medium, it is faster, more efficient and allows for more uniform heating with a virtually unlimited penetration depth. They had good quality retention after 3 years of storage. No emissions are produced at the point of use. Foods having high densities and high specific heat values are conducive to slower heating Palaniappan and Sastry.