FermenteaWhere food goes to change
Equipment · Industrial and laboratory plant
PEF unit
A pulsed electric field (PEF) unit sends brief high-voltage pulses through food in a treatment zone. Systems may treat flowing liquids or batches; the result depends on the food, equipment and validated process.
A pulsed electric field (PEF) unit exposes food to brief high-voltage electrical pulses in a treatment zone. The pulses can cause electroporation: changes in cell membranes that alter how cells behave. Depending on the food and process objective, the same general technology can be used in batch or continuous arrangements. A pilot system is not just a generator: it also needs a treatment chamber or zone and a way to handle and control the food moving through it.
The physical form varies. A documented continuous orange-juice pilot plant described in a 1998 engineering paper combined a high-voltage pulse generator with multistage flow-treatment chambers, fluid handling and aseptic packaging. A current research facility page lists a separate PEF Pilot Dual unit and illustrates an enclosed cabinet with a control panel and viewing window. These are examples, not a single standard layout; the available descriptions do not establish a universal chamber geometry, throughput or material specification.
PEF is often discussed as a nonthermal approach to reducing microorganisms in liquid foods, including juice. Its effects are not confined to microbial inactivation: electroporation can also change plant tissue structure, which is why facilities list applications such as extraction, cutting or softening, and enhanced dehydration. These are distinct process aims. A machine used to pretreat plant tissue for extraction or drying is not automatically running a pasteurization process.
The linked facility is in Frederiksberg, Denmark, at the University of Copenhagen Department of Food Science. Its instrument page lists batch and continuous operation, juice and milk decontamination, ingredient extraction and dehydration work. This documents one research installation and range of applications; it does not locate the invention of PEF in Denmark or establish the manufacturer's location.
PEF efficacy depends on the product, target organism and chosen treatment conditions. A USDA Agricultural Research Service publication from 2021 reports a study of three commercial juices and 18 tested PEF conditions. Three treatments achieved more than a five-log reduction for the pathogens studied. That result is specific to those juices and experimental conditions; it cannot be carried over as a generic setting for another beverage, food or machine.
The equipment itself does not certify a food as safe. Product formulation, process validation, hygienic handling and the complete processing line still matter. The cited studies do not provide a universal recipe or operating schedule, and this page gives no setpoints. For an actual installation, use its manufacturer's operating and electrical-safety instructions and validate the process for the specific food and regulatory context.
Microbial reduction is food- and process-specific. A 2021 study tested 18 conditions across three commercial juices; only three reported treatments achieved more than a five-log reduction for the studied pathogens. Those results are not a universal PEF schedule or guarantee for other products.
Source →PEF decontamination does not replace a validated food-safety plan, hygienic handling or applicable regulatory requirements. The sources do not establish a universal treatment for every juice or other food.
Source →The facility page places one PEF pilot unit at the University of Copenhagen Department of Food Science in Frederiksberg. This is a documented installation, not a claim about the technology's origin or manufacture.
Pulses lasting a few microseconds, at tens of kilovolts per centimetre, punch holes in microbial cells. They help pasteurise juice and extract colour from grapes. They cannot kill spores unless heat does the work.
A column still is a distillation apparatus built around one or more vertical columns. Its continuous and rectifying designs appear in several spirits traditions, but materials and product character vary by installation.
A greased rye-bread tin holds rugbrød dough while it proofs and bakes. Denmark’s National Museum documents a family recipe using three tins, but does not specify their material, shape or capacity.
The Hansen–Kühle apparatus was late-nineteenth-century brewery plant for scaling up selected yeast cultures, distinct from Emil Christian Hansen’s method of isolating yeast from a single cell.
A modified cabinet or switched-off fridge can enclose growing koji. One source documents a heating mat and probe with a PID controller. This modern setup needs monitoring of grain temperature, airflow, condensation and cleanliness.
Soft, spreadable Calabrian pork sausage made with a great deal of red chilli and fatty pork, stuffed into natural casings, sometimes smoked and matured while staying soft.
A way to add independent temperature logging to an existing food dehydrator without changing its built-in controls or protections. It is a monitoring method, not a rewiring plan.
Pleurotus cystidiosus is the abalone mushroom, a cultivated oyster-type fungus with dark brown caps that grows more slowly and is more demanding than other Pleurotus species.
A dark, balanced vinegar from Emilia-Romagna made by combining cooked or concentrated grape must with wine vinegar, then acetifying and refining it in wood under a protected specification.
A living dairy inoculum that starts controlled cream fermentation, developing acidity and aroma before sour cream or cultured butter is finished.
A small electric incubator holds jars at a selected temperature for yogurt and other documented warm food preparations. Controls, capacity and vessel arrangement vary by model.
Adygean salt is a seasoned table salt associated with Adygea and the wider North Caucasian culinary tradition. Salt is blended with garlic and a variable selection of herbs and spices; the exact mix depends on the named style and maker.
The African Caesar-group mushroom, Amanita masasiensis, is a wild ectomycorrhizal species of central and southern African woodlands, eaten locally. The genus contains deadly poisonous species, so identification needs care.
No community contributions have been published for this entry yet.
Sign in to contribute. Published comments and photos are free to read.
USDA Agricultural Research ServiceEquipment operation · Food safety · Process limits
Microbial safety and shelf-life of pulsed electric field processed nutritious juices and their potential for commercial productionPeer-reviewed 2021 study of three commercial juices and 18 PEF conditions.
Three treatments in this study achieved more than a five-log reduction of E. coli O157:H7 and Salmonella Typhimurium in the tested juices; effects apply to these products and tested conditions.
The study reports quality and shelf-life findings specific to its experiments, not a universal operating schedule.
Cited in: Validation and limits
American Society of Agricultural and Biological EngineersEquipment form · Continuous processing · History
An integrated PEF pilot plant for continuous nonthermal pasteurization of fresh orange juice1998 paper describes a pilot-scale continuous orange-juice processing system.
System components included a high-voltage pulse generator, multistage flow treatment chambers, fluid-handling system and aseptic packaging machine.
Study reports tested orange juice and microbial validation; this is a documented example rather than a universal design.
Cited in: What a PEF unit does
Aarhus University FOODHAY; facility entry for University of Copenhagen Department of Food ScienceEquipment form · Applications · Geography · Visual reference
PEF SystemFacility page identifies a high-voltage PEF Pilot Dual unit and describes batch or continuous electroporation applications.
Listed applications include ingredient extraction, dehydration pretreatment, solid-food structural modification and liquid-food decontamination such as milk and juice.
Page places the unit at the University of Copenhagen Department of Food Science in Frederiksberg and states it was revised 8 December 2025.
The photograph shows an enclosed pilot machine with a control panel and viewing window; it does not specify construction materials.
Cited in: What a PEF unit does; Uses beyond juice treatment