| 1. |
- Gogou, Eleni, et al.
(författare)
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Effect of water activity on the thermal stability of Thermomyces lanuginosus xylanases for process time temperature integration
- 2010
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Ingår i: Journal of Food Engineering. - : Elsevier BV. - 0260-8774 .- 1873-5770. ; 100:4, s. 649-655
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Tidskriftsartikel (refereegranskat)abstract
- Three strains of the thermophilic fungus Thermomyces lanuginosus were used to produce β-xylanases. The thermal stability of these xylanases at low levels of water activity was studied. Isothermal inactivation experiments were performed in the temperature range of 100–130 °C. Reduction of water activity to 0.63 and as low as 0.13 had a drastic effect on the observed D and z-values. At water activity of 0.13 the D120 °C and z-values of the three xylanases ranged from 20.4 to 37.6 min and from 23.3 to 28.9 °C, respectively. The applicability of the developed kinetic models was tested under time–temperature profiles representative of typical thermal processes. The developed systems can be applied as time–temperature integrators (TTI) at this high thermal processing range. Calculations demonstrated that the use of a triple xylanase TTI system could provide acceptable F-values prediction for z-values lower than the achieved range.
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| 2. |
- Bakalis, Serafim, et al.
(författare)
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Perspectives from CO+RE : How COVID-19 changed our food systems and food security paradigms.
- 2020
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Ingår i: Current Research in Food Science. - : Elsevier BV. - 2665-9271. ; 3, s. 166-172
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Tidskriftsartikel (refereegranskat)abstract
- Within a few weeks the world has changed, at the time this text is written (May 2020) more than 3.5 million people have been confirmed cases of COVID-19 and estimations propose up to a hundred times the number of actually infected. A third of the global population is on lockdown and a large part of our global economic activity has stopped. Food and access to food has played a visual role in portraying the impact of the outbreak on our society, with images of empty supermarket shelves appearing in mainstream media. In some countries closed schools resulted in many children not having access to free meals and mobilised a number of charities. While parts of the world are now exiting lockdown and measures start relaxing the near future remains uncertain with more waves of the pandemic expected. Given that there is currently no evidence to show that transmission of COVID-19 could occur through food or food packaging there has been limited discussion on the issue, implications and potential future scenarios within the wider food science community.Within the food research community, up to the pandemic crisis the discourse has been dominated with design and manufacture of healthy and safe foods. The main issues are relevant to sustainability, circular economy, energy and water efficiency, climate friendly practices of products and processes. Efficiency has been the focus, but resilience has not been a significant issue so far. The term food system resilience has been defined by Tendalla (Tendalla et al., 2015) as ‘capacity over time of a food system and its units at multiple levels, to provide sufficient, appropriate and accessible food to all, in the face of various and even unforeseen disturbances’. We believe that in the future we will continue to see similar pressures in the food system, e.g., comparable pandemics, effects of climate change on food production, and that resilience will become of major importance.This commentary aims to present a reflection from the past, considering the present situation to provide thoughts on the actions needed to ensure resilient food systems.
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| 3. |
- Semenoglou, Ioanna, et al.
(författare)
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Supercritical CO2 extraction of oil from Arctic charr side streams from filleting processing
- 2021
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Ingår i: Innovative Food Science & Emerging Technologies. - : Elsevier Ltd. - 1466-8564 .- 1878-5522. ; 71
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Tidskriftsartikel (refereegranskat)abstract
- Although Arctic charr side streams contain limited amounts of fish flesh, they are a rich fish oil source (46.3 ± 0.6%). The aim of the study was to investigate the potential for valorization of Arctic charr filleting side streams through the extraction of oil by supercritical CO2 technology. The effect of temperature (40 °C and 80 °C) and pressure (20, 35 and 45 MPa) on the final extract after supercritical fluid extraction (SFE) was evaluated. Temperature increase enhanced the yield but decreased the antioxidant activity at 45 MPa, did not affect the yield and the antioxidant activity at 35 MPa, whereas yield was limited at 20 MPa and 80 °C. Extracts were rich in monounsaturated fatty acids (56.7–58.3%, especially oleic acid 37.2–38.0%), and polyunsaturated fatty acids (20.2–26.1%, especially DHA 7.3–11.4%). The presence of astaxanthin significantly preserved the extracts from oxidation. Industrial relevance: Supercritical carbon dioxide extraction is a green technology appropriate for the recovery of non-polar and heat sensitive compounds. The extracted Arctic charr oils were rich in polyunsaturated fatty acids and astaxanthin which inhibited oxidation in combination with the absence of oxygen and light during the process. This technology could be an excellent alternative for more sustainable valorization of fish processing side streams. © 2021 The Author(s)
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| 4. |
- Xanthakis, Epameinondas, et al.
(författare)
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Effect of microwave assisted blanching on the ascorbic acid oxidase inactivation and vitamin C degradation in frozen mangoes
- 2018
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Ingår i: Innovative Food Science & Emerging Technologies. - : Elsevier BV. - 1466-8564 .- 1878-5522. ; 48, s. 248-257
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Tidskriftsartikel (refereegranskat)abstract
- The effect of microwave assisted and conventional water blanching of mango (Mangifera indica) under two different blanching scenarios, High Temperature Short Time (HTST) and Low Temperature Long Time (LTLT) on ascorbic acid oxidase (AAO) inactivation and on vitamin C (L-ascorbic acid & dehydroascorbic acid) retention were comparatively studied. The impact of alternative blanching processes and subsequent frozen storage on enzymatic inactivation and vitamin C was kinetically modelled. Both water and microwave HTST as well as LTLT microwave treatments of mango pieces showed high degree of AAO inactivation. An approximately 30% residual AAO activity was observed and was described through a first order fractional conversion model. Microwave assisted blanching led to higher retention of total vitamin C in both LTLT and HTST treatments. In LTLT water blanching, vitamin C loss was mainly caused by mass transfer phenomena rather than temperature degradation, while after HTST treatments the decrease of total vitamin C content seemed to be mainly related to thermal degradation than due to the leakage of the nutrients in the blanching medium. Further inactivation of the thermostable fraction of AAO and degradation of total vitamin C were observed after frozen storage for 130 days at −18.63 ± 0.48 °C.
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