FG Lebensmittelbiotechnologie und -prozesstechnik

28 Items

Recent Submissions
Concentrating Model Solutions and Fruit Juices Using CO2 Hydrate Technology and Its Quantitative Effect on Phenols, Carotenoids, Vitamin C and Betanin

Rudolph, Alexander ; El-Mohamad, Amna ; McHardy, Christopher ; Rauh, Cornelia (2021-03-16)

Fruits have an important economic impact in the context of plant-based food production. The consumption of fruit juices, mostly produced from concentrates, is particularly noteworthy. Conventional concentration methods do not always enable a sustainable and gentle concentration. The innovative gas hydrate technology addresses this point with its energy-saving, gentle character, and high concent...

Gentle Sterilization of Carrot-Based Purees by High-Pressure Thermal Sterilization and Ohmic Heating and Influence on Food Processing Contaminants and Quality Attributes

Gratz, Maximilian ; Sevenich, Robert ; Hoppe, Thomas ; Schottroff, Felix ; Vlaskovic, Nevena ; Belkova, Beverly ; Chytilova, Lucie ; Filatova, Maria ; Stupak, Michal ; Hajslova, Jana ; Rauh, Cornelia ; Jaeger, Henry (2021-03-18)

Pressure-enhanced sterilization (PES) and ohmic heating (OH) are two emerging sterilization techniques, currently lacking implementation in the food industry. However, both technologies offer significant benefits in terms of spore inactivation using reduced thermal intensity in food products, as well as minimized effects on sensory and nutritional profiles. In this study, PES and OH were tested...

Goals in Nutrition Science 2020-2025

Bassaganya-Riera, Josep ; Berry, Elliot M. ; Blaak, Ellen E. ; Burlingame, Barbara ; le Coutre, Johannes ; van Eden, Willem ; El-Sohemy, Ahmed ; German, J. Bruce ; Knorr, Dietrich ; Lacroix, Christophe ; Muscaritoli, Maurizio ; Nieman, David C. ; Rychlik, Michael ; Scholey, Andrew ; Serafini, Mauro (2021-02-09)

Five years ago, with the editorial board of Frontiers in Nutrition, we took a leap of faith to outline the Goals for Nutrition Science – the way we see it (1). Now, in 2020, we can put ourselves to the test and take a look back. Without a doubt we got it right with several of the key directions. To name a few, Sustainable Development Goals (SDGs) for Food and Nutrition are part of the global pu...

Refractive index matching (RIM) of liquid and semi-solid materials to acrylic glass for optically measuring the mechanics in soft granular matter

Vulprecht, Lennart ; Gerstenberg, Christoph ; Rauh, Cornelia (2020-04-11)

The main context of this research is the fluid mechanical analysis of stirred chunky fruit preparations, which are typically highly loaded suspensions (ca. 50%w/w) with particles susceptible to mechanical damage. Knowledge about the transport of such particles in fluid matrices is important in natural and technical processes and can be obtained using optical measurement techniques, e.g. Particl...

Matrix- and Technology-Dependent Stability and Bioaccessibility of Strawberry Anthocyanins during Storage

Stübler, Anna-Sophie ; Böhmker, Lena ; Juadjur, Andreas ; Heinz, Volker ; Rauh, Cornelia ; Shpigelman, Avi ; Aganovic, Kemal (2020-12-30)

Anthocyanins are often associated with health benefits. They readily degrade during processing and storage but are also dependent on the matrix conditions. This study investigated how strawberry anthocyanins are affected by preservation technologies and a relatively protein-rich kale juice addition during storage. A strawberry–kale mix was compared to a strawberry–water mix (1:2 wt; pH 4), untr...

COVID-19 and Food: Challenges and Research Needs

Knorr, Dietrich ; Khoo, Chor-San H. (2020-12-03)

The paper highlights several food and nutrition-related challenges encountered during the COVID-19 pandemic, including food and water safety, supply chain disruptions, food and water insecurity, consumer and food behavior, malnutrition and nutrient intakes, food surveillance technology, as well as potential post-COVID-19 strategies. Its main objective is to stimulate robust scientific discussio...

Characterization of fast-growing foams in bottling processes by endoscopic imaging and convolutional neural networks

Panckow, Robert P. ; McHardy, Christopher ; Rudolph, Alexander ; Muthig, Michael ; Kostova, Jordanka ; Wegener, Mirco ; Rauh, Cornelia (2020-05-27)

Regardless of whether the occurrence of foams in industrial processes is desirable or not, the knowledge about the characteristics of their formation and morphology is crucial. This study addresses the measuring of characteristics in foam and the trailing bubbly liquid that result from air bubble entrainment by a plunging jet in the environment of industry-like bottling process es of non-carbon...

Development of a Continuous Pulsed Electric Field (PEF) Vortex-Flow Chamber for Improved Treatment Homogeneity Based on Hydrodynamic Optimization

Schottroff, Felix ; Knappert, Justus ; Eppmann, Pauline ; Krottenthaler, Anna ; Horneber, Tobias ; McHardy, Christopher ; Rauh, Cornelia ; Jaeger, Henry (2020-04-30)

Pulsed electric fields (PEF) treatment is an effective process for preservation of liquid products in food and biotechnology at reduced temperatures, by causing electroporation. It may contribute to increase retention of heat-labile constituents with similar or enhanced levels of microbial inactivation, compared to thermal processes. However, especially continuous PEF treatments suffer from inh...

Advancing the Role of Food Processing for Improved Integration in Sustainable Food Chains

Knorr, Dietrich ; Augustin, Mary Ann ; Tiwari, Brijesh (2020-04-03)

Food scientists need to work together with agriculturists, nutritionists, civil society, and governments to develop an integrative approach to feed a growing population sustainably. Current attention on food sustainability mainly concentrates on production agriculture and on nutrition, health, and well-being. Food processing, the necessary conversion of raw materials to edible, functional, and ...

Kinetic Modeling and Numerical Simulation as Tools to Scale Microalgae Cell Membrane Permeabilization by Means of Pulsed Electric Fields (PEF) From Lab to Pilot Plants

Knappert, Justus ; McHardy, Christopher ; Rauh, Cornelia (2020-03-24)

Pulsed Electric Fields (PEF) is a promising technology for the gentle and energy efficient disruption of microalgae cells such as Chlorella vulgaris. The technology is based on the exposure of cells to a high voltage electric field, which causes the permeabilization of the cell membrane. Due to the dependency of the effective treatment conditions on the specific design of the treatment chamber,...

Condensation regulation of packaged strawberries under fluctuating storage temperature

Bovi, Graziele G. ; Caleb, Oluwafemi J. ; Rauh, Cornelia ; Mahajan, Pramod V. (2019-07-25)

Disruption in cold chain during distribution and retail could have a significant impact on in‐package condensation of optimally designed packaged fresh produce. The aim of this work was to regulate in‐package condensation and evaluate the performance of different packaging design systems for strawberries under fluctuating temperatures (between 10°C and 20°C) for 5 days. The design included the ...

Impact of modified atmosphere and humidity packaging on the quality, off-odour development and volatiles of ‘Elsanta’ strawberries

Bovi, Graziele G. ; Caleb, Oluwafemi J. ; Ilte, Kathrin ; Rauh, Cornelia ; Mahajan, Pramod V. (2018-04-14)

Development of off-odours, as well as visual quality of packaged fresh produce plays a crucial role in consumer’s choice. In this context, this work investigated the odour profile, condensation, gas composition, and postharvest quality attributes of strawberries stored under modified atmosphere and humidity packaging at 5 °C for 14 days. The packages were fitted with fixed area (69, 126.5, and ...

Moisture absorption kinetics of FruitPad for packaging of fresh strawberry

Bovi, Graziele G. ; Caleb, Oluwafemi J. ; Klaus, Eylin ; Tintchev, Filip ; Rauh, Cornelia ; Mahajan, Pramod V. (2017-10-31)

This study analysed the moisture absorption kinetics of FruitPad embedded with different concentrations of fructose with further application of such pads in packaging of fresh strawberries. The FruitPad was exposed to different storage conditions (temperature and RH) and moisture absorption kinetics was gravimetrically determined over 5 days of storage. FruitPad with 30% fructose showed highest...

Measurement and modelling of transpiration losses in packaged and unpackaged strawberries

Bovi, Graziele G. ; Rux, Guido ; Caleb, Oluwafemi J. ; Herppich, Werner B. ; Linke, Manfred ; Rauh, Cornelia ; Mahajan, Pramod V. (2018-07-06)

Transpiration and respiration are physiological processes well-known as major sources of fresh produce mass loss. Besides causing impairment of external quality, it is associated with economic loss since it inevitably decreases saleable weight. To prevent postharvest mass losses, by improved modified atmosphere and humidity packaging, comprehensive knowledge on the mechanistic basis of both pro...

Transpiration and moisture evolution in packaged fresh horticultural produce and the role of integrated mathematical models: A review

Bovi, Graziele G. ; Caleb, Oluwafemi J. ; Linke, Manfred ; Rauh, Cornelia ; Mahajan, Pramod V. (2016-08-02)

Transpiration has various adverse effects on postharvest quality and the shelf-life of fresh fruit and vegetables (FFV). If not controlled, the water released through this process results in direct mass loss and moisture condensation inside packaged FFV. Condensation represents a threat to the product quality as water may accumulate on the product surface and/or packaging system, causing defect...

Innovations in modified atmosphere and humidity packaging applied to fresh produce

Grossi Bovi Karatay, Graziele (2019)

Fresh produce are unique among food products as they remain metabolically (e.g. respiring) and physically active (e.g. transpiring) and their shelf and storage life are shortened as consequence of these processes. Both transpiration and respiration plays an important role in water loss and in the postharvest quality of horticultural products. Transpiration is a process driven by the water vapou...

Flow cytometry assessment of Lactobacillus rhamnosus GG (ATCC 53103) response to non‐electrolytes stress

Sunny‐Roberts, Elizabeth Oluwaseun ; Ananta, Edwin ; Knorr, Dietrich (2007-05-29)

Purpose – Lactobacillus rhamnosus GG, a probiotic of human origin, known to have health beneficial effects can be exposed to osmotic stress when applied in food production as important quantities of sugars are added to the food product. The aim of this study is to assess the mode of action of nonelectrolytes stress on its viability. Design/methodology/approach – Investigations were carried out...

Research agenda for SMEs in electronic platforms for the European food industry

Holt, G.C. ; Henchion, M. ; Reynolds, C. ; Baviera, B. ; Calabrese, J. ; Contini, L. ; Cowan, C. ; Dowgielwicz, T. ; Luscher, Cornelius ; Maraglino, A. ; Prugger, R. ; Tononi, R. (2007-06-05)

Purpose – This paper sets out to provide a consensus position on the potential for the inclusion of small businesses in electronic platforms in the food industry. Design/methodology/approach – The consensus was derived through a Delphi-type series of questions in an open forum of academics and industrialists across Europe. Findings – The consensus reached was of the proven benefits of electro...

Physiological analysis oflactobacillus rhamnosusVTT E‐97800

Sunny‐Roberts, Elizabeth Oluwaseun ; Knorr, Dietrich (2007-09-11)

Purpose – This paper aims to describe the physiological analysis of L. rhamnosus VTT E‐97800 and its adaptive response to osmotic stress induced by trehalose. Design/methodology/approach – Cells of L. rhamnosus E800 in the stationary phase of growth were subjected to osmotic stress induced by trehalose treatments. The effects of osmotic stress on the viability of the study strain were determin...

Food for an Urban Planet: Challenges and Research Opportunities

Knorr, Dietrich ; Khoo, Chor San Heng ; Augustin, Mary Ann (2018-01-19)

In 2014, Khoo and Knorr (1) identified the global shift in population demographics as one of the twenty-first century grand challenges, which warrants research prioritization by the food and nutrition communities. A persistent global growth trend toward urbanization can be attributed to this demographic shift. Satterthwaite et al. (2) characterized urbanization as “the increasing share of a nat...