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Applications of pulsed electric fields for processing potatoes: Examples and equipment design
(2022)
Parniakov, Oleksii ; Lebovka, Nikolai ; Wiktor, Artur ; Alles, Martina Comiotto ; Hill, Kevin ; Töpfl, Stefan
In the last two decades, pulsed electric fields (PEF) have successfully been introduced into the food industry, as one of the most promising and "game changing" technologies. This review is devoted to the recent applications of pulsed electric fields used in processing potatoes. The potato processing market size was estimated to be ca. USD 24.83 billion (2018) and with an annual growth rate of 5.2%. The physicochemical characteristics of potatoes and the specificity of potato processing lines makes a pulsed electric field very versatile and flexible allowing one to achieve different technological aims by its implementation into technological lines. In this paper, a short analysis of the potato structure and its nutritional properties, applications of moderate electric fields, ohmic heating, and pulsed electric fields are presented. Moreover, the basic electroporation effects, metabolic responses, texture modification and different PEF assisted processes applied to the potato are discussed. Finally, some examples of commercial applications and a brief description of the available equipment for the PEF processing of potatoes are presented.
Speck (geb. Lukas), Melanie ; Rohn, Holger ; Lettenmeier, Michael ; Liedtke, Christa ; Wiesen, Klaus
Der Bereich Ernährung wird in den kommenden Jahrzehnten vor zahlreichen Herausforderungen stehen, die sich aus den veränderten Lebensgewohnheiten und globalen Konsummustern bei gleichzeitig hohem Ressourcenverbrauch ergeben. Vor diesem Hintergrund wird in diesem Papier ein neu entwickeltes Instrument zur Verringerung der Auswirkungen auf die Ernährung vorgestellt, der sogenannte Ernährungsfußabdruck. Das Instrument basiert auf der Umsetzung des Konzepts einer nachhaltigen Ernährung in Entscheidungsprozessen und der Unterstützung einer ressourcenschonenden Gesellschaft. Das Konzept integriert jeweils vier Indikatoren aus den beiden ernährungsrelevanten Bereichen Gesundheit und Umwelt und verdichtet sie zu einem leicht kommunizierbaren Ergebnis, das sich in seinen Ergebnissen auf eine Wirkungsebene beschränkt. Anhand von acht Mittagsmahlzeiten werden die Methodik und ihre Berechnungsverfahren detailliert vorgestellt. Die Ergebnisse unterstreichen die allgemeine wissenschaftliche Sichtweise auf Lebensmittel; Mahlzeiten auf der Basis von tierischem Eiweiß sind im Hinblick auf ihre Gesundheits- und Umweltauswirkungen relevanter. Das Konzept scheint für Verbraucher nützlich zu sein, um ihre eigene Wahl zu bewerten, und für Unternehmen, um ihre internen Daten, ihre Benchmarking-Prozesse oder ihre externe Kommunikationsleistung zu erweitern. Methodische Unzulänglichkeiten und die Interpretation der Ergebnisse werden erörtert, und die Schlussfolgerung zeigt das Potenzial der Instrumente für die Gestaltung von Übergangsprozessen und für die Verringerung des Verbrauchs natürlicher Ressourcen durch die Unterstützung von Entscheidungen und Wahlmöglichkeiten von Lebensmittelanbietern und Verbrauchern.
Leong, Sze Ying ; Roberts, Rebecca ; Hu, Zhihao ; Bremer, Phil ; Silcock, Patrick ; Töpfl, Stefan ; Oey, Indrawati
The impact of Pulsed Electric Field (PEF) processing pre-treatment on the texture and kinetics of in vitro starch digestibility of French fries made from two potato cultivars (Solanum tuberosum L.) containing dry matter content ranging from 19 to 22% was investigated. Whole and steam-peeled potato tubers were treated with a pilot scale PEF unit (electric field strength of 1.1 and 1.9 kV/cm with energy input <10 kJ/kg or ∼50 kJ/kg). This trial was carried out in a commercial French-fry plant using an industrial scale cutter, blancher, fryer and blast-freezer to prepare the frozen par-fried French fry samples. After subsequent final batch frying of the frozen fries, at 180 °C for 3 min to mimic the typical preparation practice at restaurant, retail and household, the outer crust of the fries produced from PEF-treated potatoes was significantly harder (9.4–16.3 N) than crust produced from untreated potatoes (6.9–8.5 N). High intensity (1.9 kV/cm with energy input ∼50 kJ/kg) PEF processing was found to cause defects (i.e. hollowness in the internal core) in the fries. A fractional conversion model was a good fit for the starch digestion kinetics of all French fry samples during the small intestinal phase (based on standardised INFOGEST static in vitro digestion assay). A lower % of total starch hydrolysis was predicted for French fries produced from high dry matter (>21%) tubers pretreated with PEF at electric field strength of 1.9 kV/cm. The findings generated in this study demonstrate PEF pretreatment may influence the texture of French fries and the extent of starch digestion that occurs.
Woldemariam, Henock Woldemichael ; Harmeling, Hanna ; Emire, Shimelis Admassu ; Getachew Teshome, Paulos ; Töpfl, Stefan ; Aganovic, Kemal
The impact of pulsed light (PL) treatment on naturally occurring microorganisms, mycotoxins, and on physicochemical properties in red pepper powder was investigated. Powder samples were exposed to different PL treatments up to 61 pulses, with fluence ranging from 1.0 to 9.1 J/cm2. The highest fluence applied (9.1 J/cm2, 61 pulses, 20 s) resulted in 2.7, 3.1, and 4.1 log CFU/g reduction of yeasts, molds, and total plate counts (TPC), where initial microbial loads were 4.6, 5.5, and 6.5 log CFU/g, respectively. At the same fluence intensity, a maximum reduction of 67.2, 50.9, and 36.9% of aflatoxin B1 (AFB1), total aflatoxins (AF), and ochratoxin A (OTA) were detected, respectively. Proportional increase in temperature of the samples was observed from the absorbed PL energy, reaching maximum of 59.8°C. The inactivation of investigated microorganisms and mycotoxins followed first-order kinetics (R2 > 0.95). The fluence intensity at 6.9 and 9.1 J/cm2 did not cause degradation, but rather a significant (p < .05) and apparent increase of total phenols. Total color difference (ΔE*) revealed only “slight differences,” compared to the untreated sample. In conclusion, higher reduction of microbial load and mycotoxins in red pepper powder could be achieved, when higher treatment intensity was applied. This suggests the PL as a potential technology for decontamination of red pepper powder and other spice powders.
Tools for designing riverscapes co-creatively. Walk! Find typologies! Design spatial visions!
(2020)
Taking the transdisciplinary research study “Green fingers for a climate resilient city”, funded by the German Ministry of education and research (BMBF), as an example, this paper follows the hypothesis that processes of landscape planning and designing multifunctional green spaces and processes of co-creation need to be combined to stimulate climate resilient city transformation. The findings are that efforts to combine these processes benefit from making complex climate-resilient city planning accessible for people of different professional backgrounds. The paper showcases how storytelling (Schmidt 2019), mapping (Langner 2009) and guided walks (Schultz 2019) are means to mutually engage with, perceive and understand multifunctional green spaces, inspire ownership, and build capacity for the city’s climate-resilient transformation.
Shockwaves are mechanical pressure pulses generated in liquids and gases. Based on the principles of acoustics, shockwavescan propagate through fluids such as water. At interfaces of materials with different acoustic impedances, mechanical energy is dissipated, and disintegration of biological tissue can be achieved. Physical properties as well as technical requirements for shockwave generation by electrohydraulic, electromagnetic or piezoelectric energy conversion have been reported in the literature. The use of electrohydraulic shockwaves for food treatment is an emerging food processing technology, where a lack of scientific and technical knowledge has limited further advancements in process and equipment design. In scientific literature, single aspects required for process description are available, e.g., in metallurgy, mining, air purification or particle accelerators, but their combination toward a combined model is required to characterize underlying mechanisms of action. In food, most of the studies have focused on shockwave technology for treatment of meat cuts with the purpose of reducing aging time, softening of tissue and improving its tenderness. Other applications of the shockwave technology could expand to biological inactivation, targeted texture modifications and improving extractive and refining processes in agriculture industries. Total processing costs are estimated in a range of a few Euros per ton of product. Despite being a promising alternative to existing processes used for these purposes, the application of shockwave in the food industry is limited to date to research on pilot-scale prototypes.
PEF is an innovative technology to extend the shelf life of fresh liquid food products, mainly juices, with minor impact on the quality. Many lab scale studies have been published, indicating the great potential of PEF for the juice industry. For industrial realization, the PEF systems have been adapted to the industrial requirements, establishing HACCP and hygienic design concept. Important process parameters have been identified from research and integrated in industrial PEF processes. Juice producers are now able to use PEF for their production lines.
Dadana, Magdalena ; Matysa, Aleksandra ; Kaminska-Dworznicka, Anna ; Lammerskitten, Alica ; Töpfl, Stefan ; Parniakov, Oleksii
This chapter presents the mechanism of the enhancement of freezing by means of ultrasound (US). It has been demonstrated that the effects of US are a rather complex issue. In theory, ultrasound creates cavitation bubbles throughout the volume of the product, which promotes nucleation of the ice and crushes the crystals already present in food. They can also enhance convective heat transfer to the cooling media, thereby accelerating freezing. Moreover, it has been shown that ultrasound reduces the degree of supercooling before nucleation in frozen food. Additionally, numerous experimental studies indicate that ultrasound assisted freezing is a good method to achieve homogenous crystallizations, reduce the deteriorating effect of freezing on food, and thus improve quality after thawing.
Among all nonthermal food processing technologies, high intensity pulsed electric fields (PEF) is one of the most appealing due to its short treatment times and reduced heating effects. Its capability to enhance extraction processes and to inactivate microorganisms at temperatures that do not cause any deleterious effect on flavor, color or nutrient value of foods opens interesting possibilities for the food processing industry.
This new and revised edition of Pulsed Electric Fields Technology for the Food Industry presents the information accumulated on PEF over the last decade by experienced microbiologists, biochemists, food technologists and electrical and food engineers. With insight into current applications of PEF across the food industry, this text offers a comprehensive and up to date resource on PEF application in the food industry from the scientific fundamentals to its use in various food types to environmental and regulatory aspects. For researchers and industry professionals seeking a single source containing all of the relevant and up to date information on PEF in foods, look no further than this essential text.