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Zeitschriftenbeiträge (peer-reviewed)

2021

Goisser, S.; Wittmann, S.; Mempel, H. (2021): Food-scanner applications in the fruit and vegetable sector. Landtechnik 76 (1), S.52-67.
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In the past few years, portable and smartphone-based diagnostic technologies have found their way into the agri-food industry. The aim of this research was to evaluate the perfor-mance of portable near-infrared (NIR) spectrometers, so called food-scanners, with regard to their predictive accuracy of important quality parameters of fruit and vegetables. Food-scan-ner measurements were performed in combination with destructive measurements of the corresponding quality trait (sugar content, dry matter, relative water content) on a wide range of produce from the fruit and vegetable assortment. This study evaluated dry matter content of apple, avocado, blueberry, table grape and tangerine, which yielded cross validation re-sults (r²) of up to 0.95, 0.87, 0.94, 0.92 and 0.92 respectively. Furthermore, the evaluation of food-scanner spectra for the prediction of sugar content of blueberry, kiwi, mango, persim-mon, table grape, tangerine and tomato yielded cross validations (r²) of up to 0.95, 0.84, 0.80, 0.75, 0.95, 0.93, and 0.87. Furthermore, relative water content of ginger obtained a cross val-idation correlation of r² = 0.91. The results show that these traits can be predicted with a high degree of accuracy using non-destructive measurements performed with three commercially available food-scanners SCiOTM, F-750 Produce Quality Meter, and H-100F. Consequently, food-scanners can be used as objective measurement tools along the supply chain of fresh produce to quickly determine fruit quality. In addition, a practical example shows the poten-tial of these instruments for non-destructive quality assessment in incoming goods control at fruit and vegetable wholesalers over a time period of several weeks. Furthermore, possible areas of application of food-scanners along the supply chain of fresh produce are discussed, possibilities for practical applications are presented and time-saving means are highlightedLANDTECHNIK 76(1), 2021, 52–67Food-scanner applications in the fruit and vegetable sectorSimon Goisser, Sabine Wittmann, Heike MempelIn the past few years, portable and smartphone-based diagnostic technologies have found their way into the agri-food industry. The aim of this research was to evaluate the perfor-mance of portable near-infrared (NIR) spectrometers, so called food-scanners, with regard to their predictive accuracy of important quality parameters of fruit and vegetables. Food-scan-ner measurements were performed in combination with destructive measurements of the corresponding quality trait (sugar content, dry matter, relative water content) on a wide range of produce from the fruit and vegetable assortment. This study evaluated dry matter content of apple, avocado, blueberry, table grape and tangerine, which yielded cross validation re-sults (r²) of up to 0.95, 0.87, 0.94, 0.92 and 0.92 respectively. Furthermore, the evaluation of food-scanner spectra for the prediction of sugar content of blueberry, kiwi, mango, persim-mon, table grape, tangerine and tomato yielded cross validations (r²) of up to 0.95, 0.84, 0.80, 0.75, 0.95, 0.93, and 0.87. Furthermore, relative water content of ginger obtained a cross val-idation correlation of r² = 0.91. The results show that these traits can be predicted with a high degree of accuracy using non-destructive measurements performed with three commercially available food-scanners SCiOTM, F-750 Produce Quality Meter, and H-100F. Consequently, food-scanners can be used as objective measurement tools along the supply chain of fresh produce to quickly determine fruit quality. In addition, a practical example shows the poten-tial of these instruments for non-destructive quality assessment in incoming goods control at fruit and vegetable wholesalers over a time period of several weeks. Furthermore, possible areas of application of food-scanners along the supply chain of fresh produce are discussed, possibilities for practical applications are presented and time-saving means are highlighted.

2020

Wittmann, S.; Jüttner, I.; Mempel, H. (2020): Indoor Farming Marjoram Production—Quality, Resource Efficiency, and Potential of Application . Agronomy 10 (11), S.1769.
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Indoor vertical farming offers great opportunities regarding a sustainable and consistent production of high-quality herbs and raw materials all year round for the perfume, chemical, or food industry. Cultivation takes place in an enclosed structure, operating predominantly independent from external conditions in multi-layer systems equipped with artificial lighting, enabling extremely high resource use efficiencies with a simultaneous increase in yield. On the other hand, field production in terms of plant quality and harvesting times is highly influenced by environmental conditions, making it difficult to maintain homogenous raw material qualities throughout the year. To show how different light qualities affect the overall efficiency and quality of Origanum majorana grown in an indoor farm, the resource consumption, yield, and cultivation time as well as the essential oil quantity was analyzed, and the efficiencies in terms of energy and land use efficiency calculated. The experimental setup clearly demonstrated that the yield regarding fresh as well as dry matter and oil content was comparable to one square meter of open field production. Based on this, the multi-layer system and the noticeable lowered growth period result in a significantly higher area efficiency compared to the open field, leading to a potential increase of annual yields of dried leave weight and oil contents by up to 21 times. It was also shown that a white spectrum (W) showed similar influence on plant growth and yield as a spectrum consisting of blue and red (B/R). Nevertheless, the LED treatment W did show higher light use efficiencies as well as a better working conditions inside the cultivation chamber. By an integration of indoor vertical farming into existing industrial processes, new and innovative opportunities for a flexible and low-risk supply chain seem feasible and according to German food industry meet the interests of existing stakeholders.

Havardi-Burger, N.; Mempel, H.; Bitsch, V. (2020): Driving forces and characteristics of the value chain of flowering potted plants for the German market. European Journal of Horticultural Science 85 (4), S.267-278.
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The study investigated the value chain of flowering potted plants supplying the German market and the drivers influencing chain actors. The study builds on strategic and horticultural value chain literature. Data was collected by conducting 20 in-depth interviews with chain actors from different stages in the value chain and analyzed through qualitative content analysis. Results showed that the value chain of flowering potted plants is divided in two pathways due to distinct propagation methods, either generative (seeds) or vegetative (cuttings). Whereas propagation material is generally produced in southern countries, such as Africa and Central America, young plants and potted plants are cultivated within Europe. The paper identified driving forces such as retailer requirements, weather conditions, price pressure and innovations. Furthermore, the study provides an overview of chain activities and processes to help the sector anticipate developments, and support stakeholders in future decisions.

Goisser, S.; Wittmann, S.; Fernandes, M.; Mempel, H.; Ulrichs, C. (2020): Comparison of colorimeter and different portable food-scanners for non-destructive prediction of lycopene content in tomato fruit. Postharvest Biology and Technology 167 (111232), S.1-8.
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Lycopene, the red colored carotenoid in tomatoes, has various health benefits for humans due to its capability of scavenging free radicals. Traditionally, the quantification of lycopene requires an elaborate extraction process combined with HPLC analysis within the laboratory. Recent studies focused simpler methods for determining lycopene and utilized spectroscopic measurement methods. The aim of this study was to compare non-destructive methods for the prediction of lycopene by using color values from colorimeter measurements and Vis/NIR spectra recorded with three commercially available and portable Vis/NIR spectrometers, so called food-scanners. Tomatoes of five different ripening stages (green to red) as well as tomatoes stored up to 22 days after harvest were used for modeling. After measurement of color values and collection of Vis/NIR spectra the corresponding lycopene content was analyzed spectrophotometrically. Applying exponential regression models yielded very good prediction of lycopene for color values L*, a*, a*/b* and the tomato color index of 0.94, 0.90, 0.90 and 0.91, respectively. Color value b* was not a suitable predictor for lycopene content, whereas the (a*/b*)² value had the best linear fit of 0.87. In comparison to color measurements, the cross-validated prediction models developed for all three food-scanners had coefficients of determination (r²CV) ranging from 0.92 to 0.96. Food-scanners also can be used for additional measurements of internal fruit quality, and therefore have great potential for fruit quality assessment by measuring a multitude of important fruit traits in one single scan.

Goisser, S.; Mempel, H.; Bitsch, V. (2020): Food-Scanners as a Radical Innovation in German Fresh Produce Supply Chains. International Journal on Food System Dynamics 11 (2), S.101-116.
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Originally advertised as tools for end-consumers, portable food-scanners have recently reached a high level of awareness and show potential as instruments for quality assessment along fruit and vegetable supply c hains. The current study explores preferences and concerns of chain actors regarding the implementation of this technology through semi-structured interviews. Results indicate that food-scanners could facilitate quality control at different levels of the fresh produce supply chain by providing fast, non-destructive and objective measurements. Concerns about the application of food-scanners could be identified with respect to potential additional requirements of fruit wholesaler resulting in more pressure on producers. To further a goal-oriented and user-directed development of this new technology, future research should be directed at its impacts on perception of fruit quality along the chain as well as end-consumers’ readiness to use these devices in everyday life.

2019

Goisser, S.; Mempel, H.; Bitsch, V. (2019): Potential Application of Food-Scanners in Fruit and Vegetable Supply Chains and Possible Consequences for the German Market. Proceedings in System Dynamics and Innovation in Food Networks 2019, S.173-181.
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Originally advertised as tools for end-consumers, food-scanners have recently gained publicity and show potential as instruments for quality assessment along the fruit and vegetable supply chain. The current study explores preferences and concerns of chain actors regarding the implementation of this technology through semi-structured interviews. Results indicate that food-scanners could facilitate quality control at different levels of the fresh produce supply chain by providing fast, non-destructive and objective measurements. Concerns about the application of food-scanners could be identified with respect to potential additional requirements of trading companies resulting in more pressure on producers. The use of food-scanners by end-consumers is discussed critically. To further a goal-oriented and user-directed development of this new technology, future research should be directed at its impacts on perception of fruit quality along the chain as well as end-consumers’ readiness to use these devices in everyday life.

Goisser, S.; Krause, J.; Fernandes, M.; Mempel, H. (2019): Determination of tomato quality attributes using portable NIR-sensors. 4th International Conference on Optical Characterization of Materials (OCM), March 13th - 14th, 2019, Karlsruhe, Germany, S.1-12.
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Each material has its own specific spectral signature independent if it is food, plastics, or minerals. During the conference we will discuss new trends and developments in material characterization. You also will be informed about latest highlights to identify spectral footprints and their realizations in industry.

2018

Wittmann, S.; Mempel, H. (2018): Anwendung der Chlorophyllfluoreszenz im Gewächshaus zur Erkennung von Salzstress an Lycopersicon esculentum L. ‘Tastery’. DGG-Proceedings Vol. 8 (2018) (6), S.1-5.
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Goisser, S.; Fernandes, M.; Ulrichs, C.; Mempel, H. (2018): Non-destructive measurement method for a fast quality evaluation of fruit and vegetables by using food-scanner. DGG-Proceedings 8 (13), S.1-5.
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2016

Mempel, H.; Gabriel, A.; Kersebaum, A.; Bettin, A.; Rath, T.; Ohmayer, G. (2016): WeGa-Student: Entwicklung und Erprobung eines standortübergreifenden B.Sc.-Lehrmoduls zum Thema Prozess- und Produktsicherheit im Gartenbau. DGG-Proceedings (German Society of Horticultural Sciences) 6 (5), S.1-5.
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2012

Kersebaum, A.; Bettin, A.; Mempel, H.; Rath, T.; Ohmayer, G. (2012): WeGa-Student: Hochschulübergreifendes E-Learning Modul im Gartenbau. Landtechnik 67 (5), S.342-345.
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In einem gemeinsamen E-Learning-Kurs beschäftigten sich Bachelor-Studierende der Hochschulen Osnabrück und Weihenstephan-Triesdorf sowie der Leibniz Universität Hannover im Wintersemester 2011/2012 mit den spezifischen Anforderungen des Gartenbaus an Qualitätsmanagement und Qualitätssicherung. Ziel der Kooperation der drei Hochschulen war es, die Lehre an allen beteiligten Standorten durch die Bündelung von Kompetenzen zu verbessern. Studierende und Dozenten zogen nach Abschluss des Kurses ein überwiegend positives Fazit.


Beiträge in Monografien, Sammelwerken, Schriftenreihen

2018

Goisser, S.; Fernandes, M.; Mempel, H. (2018): Zerstörungsfreie Messmethode zur schnellen Qualitätsbewertung und Haltbarkeitsabschätzung von Lebensmitteln mit Hilfe von Food Scannern. Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33, S.34.


Wissenschaftliche Poster

2018

Suhl, J.; Schmidt, U.; Mempel, H.; Akyazi, G.; Dannehl, D. (2018): Entwicklung eines sensorbasierten intelligenten Gewächshaus-Managementsystems. BHGL Schriftenreihe Band 33 - 2018 33, S.151.

Wittmann, S.; Mempel, H. (2018): Auswirkung einer Mono- und Polychromatischen Belichtung auf den Wuchs und die Photosynthese von Lactuca Sativa. Tagung der Deutschen Gartenbauwissenschaftlichen Gesellschaft. BHGL-Schriftenreihe 33, S.149.


Presseberichte und Medienbeiträge

2020

Mempel, H. (2020): Indoor Vertical Farming – Ein innovatives System für die Pflanzenproduktion der Zukunft. Homepage: Stiftung Energie & Klimaschutz 2020.
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Das Indoor Vertical Farming spezialisiert sich auf die Produktion von Pflanzen in mehrlagigen, vertikal angeordneten Kultursystemen in einer geschlossenen Gebäudestruktur (Container, Lagerhallen, etc.). Die Lichtenergie für das Pflanzenwachstum wird über künstliche Belichtungssysteme wie LED-Module zur Verfügung gestellt. Von der Temperatur über die Luftfeuchte, Belichtungszeit und -intensität, dem Lichtspektrum bis hin zur Bewässerung kann alles gezielt eingestellt und optimiert werden. Sensoren und Kamerasysteme ermöglichen zudem das Wachstum und die pflanzliche Entwicklung in Echtzeit zu beobachten und kontinuierlich zu optimieren.


Vorträge

2019

Goisser, S.; Mempel, H. (2019): Mobile Nahinfrarottechnik im Post-Harvest-Management. Vortrag im Forum "Auf einer Wellenlänge" des Forschungsprojekts "Food-Scanner" am 26.10.2019 in Freising.

Goisser, S.; Mempel, H. (2019): Können Food-Scanner Lebensmittelverluste reduzieren? "Zu gut für die Tonne" - Themenabend zur Lebensmittelverschwendung am 14.05.2019 in Ansbach.

Goisser, S.; Krause, J.; Fernandes, M.; Mempel, H. (2019): Determination of tomato quality attributes using portable NIR-sensors. 4th International Conference on Optical Characterization of Materials (OCM), March 13th - 14th, 2019, Karlsruhe, Germany.

Goisser, S.; Mempel, H.; Bitsch, V. (2019): Potential applications of food-scanners in fruit and vegetable supply chains and possible consequences for the German market. 13th International European Forum (Igls-Forum) on System Dynamics and Innovation in Food Networks, February 18th - 22nd, 2019, Garmisch-Partenkirchen, Germany.

2018

Goisser, S.; Mempel, H. (2018): Der Einsatz portabler Mini-Sensoren vom Erzeuger bis zum Verbraucher. Deutscher Obst & Gemüsekongress (20.-21.09.2018 Düsseldorf).

Mempel, H.; Goisser, S. (2018): Fruchtqualität auf Knopfdruck – Nachernteverluste im Gartenbau. Vortrag beim 1. Bayerisches Symposium gegen Lebensmittelverschwendung – Du bist, was du aufisst!“ Fachsymposium 2018 .
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Mempel, H.; Goisser, S. (2018): Qualitätsveränderungen bei pflanzlichen Lebensmitteln. Vortrag beim Fachkongress "Lebensmittel retten 4.0 - Innovative Verfahren zur Reduzierung von Lebensmittelverlusten" am 16.05.2018 im Bayerischen Staatsministerium für Ernährung, Landwirtschaft und Forsten.
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Sonstige Veröffentlichungen

2015

Mempel, H. (2015): Wasserversorgung von Topfpflanzen vom Produzenten bis zum Verkauf .