Application of high pressure processing for extending the shelflife of fresh lactic curd cheese a thesis submitted in total fulfilment of the requirements for the degree of doctor of philosophy hossein daryaei b. Pulsed electric field processing involves the application of pulses of high electric voltage in the range of 20 to 80 kvcm across food contained between 2 electrodes. Effect of high intensity pulsed electric fields and heat treatments on vitamins of milk. This technology is attracting a great deal of interest around the world because it is more cost effective than conventional systems due to the conservative nature of pef. Food preservation by pulsed electric fields and selected antimicrobials abstract by bilge altunakar, ph.
Food preservation by pulsed electric fields 1st edition. Preservation of foods with pulsed electric fields discusses the basics of high voltage pef as a low temperature food processing method, and the application of this technology in food preservation. The appearance and quality of fresh foods are not altered by the application of pef, while microbial inactivation is caused by irreversible pore formation and destruction. Classification of the static and continuousflow treatment chambers for pulsed electric field treatment. Summary written by four experts actively researching alternatives to conventional thermal methods in food preservation. Water solutions or liquid food are treated by high voltage pulses in a flow. Effects of pulsed electric field processing on microbial. Pulsed electric field pef applications can be utilised to achieve disintegration of biological tissues or microbes. Pulsed electric field technology offers new potential for. This technology is attracting a great deal of interest around the world because it is more cost effective than conventional systems due to the. Pulsed electric fields pef involves the application of highvoltage energy 0. E electric field strength, ecrit critical electric field strength 2.
High intensity pulsed electric field hipef processing involves the application of pulses of. It is suitable for preserving liquid and semiliquid foods, removing microorganisms and. Impact of pulsed electric fields on food enzymes and shelf. Mar 23, 2011 among these novel technologies, pulsed electric fields pef have shown to be a potential nonthermal treatment capable of preserving liquid foods with freshlike characteristics. Food quality and safety can be improved through pulsed electrical fields, according to dr ingrid aguiloaguayo. High intensity pulsed electric fields, often referred to as pulsed electric fields pef toepfl et al. Based on the underlying mechanism of action, in this paper the crucial process parameters electrical field strength, total pulse energy input and treatment temperature were investigated. As a result, in the last decade, great technological advances have been accomplished regarding to pef processing, such as improvement on the chamber designs.
Pulsemaster sells 100kw pefsystem to french fry processor for up to 2. Pulsed electric fields in food production the dairy site. Feb 01, 2008 abstract the objectives of the study were to formulate a rice pudding to be processed by pulsed electric fields pef, define suitable pef parameters and measure the shelf life of pef. Pulsed electric field processing of foods new food magazine. Recently arrived pulsed electric field pef processing equipment will be put to test for large scale french fry production over the next three months this technology, which uses brief pulses of. Pulsemaster, a global leader in pulsed electric field systems for potato processing, announces that it has entered into an agreement for the sale of a 100kw pulsed electric field system to a major producer of high quality french fries and potato specialities. Reversible electrical breakdown of lipid bilayer membranes.
The effects of pulsed electric field pef and ageing 3, 7,14 and 21 days on the shear force, protein profile, and postmortem proteolysis of beef loins m. Swanson, department of food science and human nutrition, washington state university, pullman, wa 99164. Pef treatment is a chemicalfree process affecting microbes. Food 3050 2012 spring lecture 24 pulsed electric field pef processing pulsed elec. The key objectives of this proposal are to 1 design and optimize the freezing chamber featured with combined pulsed electric and magnetic fields and 2 test and validate the control of the nucleation and growth of ice crystals in targeted fresh fruits and vegetables. Nonthermal pasteurization of liquid foods using high. High intensity pulsed electric fields applied for food. Effect of pulsed electric field on drying rate and. Optimization of pulsed electric field parameters for mango. Food preservation by pulsed electric fields is a standard reference for all those involved in research into pef food processing and its commercialisation. Rice pudding was processed by a combination of mild heat 55c for 30 s and pef. Abstract the objectives of the study were to formulate a rice pudding to be processed by pulsed electric fields pef, define suitable pef parameters and measure the shelf life of pef.
Electric field results in inactivation of microorganisms suspended in the food medium without significantly increasing the temperature of the food product. These include ohmic heating, microwave heating 46, low electric field stimulation 7,8, highvoltage arc discharge 912, and highintensity pulsed electric field pef application 15. Presents information on traditional and emerging nonthermal food processing technologies in a convenient, singlesource volumeoffering an incisive view of the latest experimental results, state of theart applications, and new developments in food preservation technology. Pulsed electric field assisted pressing of sugar beet. The principles of pef processing on food work through electroporation. To investigate the effect of electric fields on the postharvest life of some fruits and vegetables, they were exposed to an alternating current high electric field hef for short periods. Pulsed electric field pef used short electric pulses to preserve the food.
An emerging technology for food preservation article pdf available january 2017 with 1,046 reads how we measure reads. Increasing treatment intensity will lead to formation of large irreversible membrane pores. Preservation of liquid foods by high intensity pulsed electric fields basic concepts for process design. Pulsed electric field technology in food preservation. Sterilization of liquid foods by pulsed electric fieldsan. Conventional freezing methods are used to retain the quality of food products over long storage periods. There are many different ways of applying electric energy for food pasteurization. Based on the consumers demand for fresh, durable and safe foods it is obligatory for the food industry to preserve their products at the best. Effects of pulsed electric fields processing strategies on. Pef has been suggested as a technology of choice to obtain safe and highquality plantbased foods with a shelflife similar to the attained with mild heat pasteurization treatments.
It is one of the most appealing technology due to short treatment time typically below 1 second. Jun 28, 2018 recently arrived pulsed electric field pef processing equipment will be put to test for large scale french fry production over the next three months this technology, which uses brief pulses of. Barbosacanovas todays consumers prefer foods with convenience, variety, adequate shelflife, reasonable. Claudia siemer, stefan toepfl, volker heinz 2014 inactivation of bacillus subtilis spores by pulsed electric fields pef in combination with thermal energy i. Among these novel technologies, pulsed electric fields pef have shown to be a potential nonthermal treatment capable of preserving liquid foods with freshlike characteristics. Preservation of foods with pulsed electric fields 1st edition. Novel freezing technique using combined pulsed electric. When product is heat pasteurized, it loses a great part of the characteristics that make.
Oral presentation at the 40 th annual aifst convention, 2427 june, melbourne, australia. Show less pulsed electric field pef food processing is a novel, nonthermal preservation method that has the potential to produce foods with excellent sensory and nutritional quality and. Pulsed electric fields technology is the application of very short pulses micro to milliseconds, at electric field intensities ranging from 1080 kvcm, applied to a food product held between two electrodes inside a chamber, usually at room temperature. Correspondingly, this memoir highlights the potential of pulsed electric field technology as. Application of high pressure processing for extending the. Effects of pulsed electric field treatment time on inactivation of native enzymes in bovine milk. Preservation of liquid foods by high intensity pulsed electric fields pef is an interesting alternative to traditional techniques like thermal pasteurization. The pulsed electric field pef was studied separately to better understanding of this complex process. The first commercial applications of the technique have been achieved.
This work focuses on the effects of pef in water solutions only. Effect of oscillating magnetic field pulses on the. Presents information on traditional and emerging nonthermal food processing technologies in a convenient, singlesource volumeoffering an incisive view of the latest experimental results, stateoftheart applications, and new developments in food preservation technology. Pef treatment is conducted at ambient, subambient, or slightly above ambient temperature for less than 1 s, and energy loss due to heating of foods is minimized. Application of pulsed electric field technique in food. Processing foods with highintensity pulsed electric fields pef is a new technology to inactivate microorganisms and enzymes with only a small increase in food temperature. Microbial inactivation of foods by pulsed electric fields. Feb 02, 2015 pulsed electric field pef processing is a novel, nonthermal preservation method that has the potential to produce foods with excellent sensory and nutritional quality and shelflife. Pulsed electric field processing in food technology. The conventional thermal food preservation and processing techniques appears to have the shortcoming of adversely affecting the food quality, organoleptic properties and nutrients. Pef holds potential as a type of lowtemperature alternative pasteurization process for sterilizing food products. Pef processing parameters were 33 kvcm electric field strength, 100 lh flow rate, 1.
Preservation of foods with pulsed electric fields 1st. Research of pulsed electric fields technology is ongoing around the world. View test prep final bio from hlth 501 at liberty university. High intensity pulsed electric field pef processing involves the application of pulses of high voltage typically 20 80 kvcm to foods placed between 2 electrodes. Novel freezing technique using combined pulsed electric and. The high electric field 430 kvm treatment on pears, plums and bananas in the preclimacteric period suppressed the respiration rate during the climacteric. With the increase in consumer awareness, demand for minimally processed foods and ecofriendliness, various technologies were developed for food processing and preservation. Pulsed electric field pef electroporation is a method for processing cells by means of brief pulses of a strong electric field. Pulsed electric fields for food processing technology. Written by four experts actively researching alternatives to conventional thermal methods in food preservation.
By development of equipment based on state of the semiconductor. Nonthermal preservation of foods food science and technology. In the last decades, pulsed electric fields pef have been proposed as alternative or complementary to traditional food processing technologies in order to improve the competitiveness of the food industry. Effect of high electric fields on some fruits and vegetables. Pulsed electric field pef processing is a novel, nonthermal preservation method that has the potential to produce foods with excellent sensory and nutritional quality and shelflife. May 06, 2015 sterilization of liquid foods by pulsed electric fieldsan innovative ultrahigh temperature process kai reineke, 1, 2, felix schottroff, 2 nicolas meneses, 3 and dietrich knorr 2 1 quality and safety of food and feed, leibniz institute for agricultural engineering, potsdam, germany. Pulsed electric field pef use short electric pulses to preserve the food. Pulsed electric field assisted pressing of sugar beet slices. Various applications have been identified such as improvement of mass transfer during extraction or drying as well as gentle food preservation. Drying rate was recorded after an interval of two hours till moisture content on.
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