| 1. |
- Stedt, Kristoffer, 1991, et al.
(författare)
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Post-harvest cultivation with seafood process waters improves protein levels of Ulva fenestrata while retaining important food sensory attributes
- 2022
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Ingår i: Frontiers in Marine Science. - : Frontiers Media SA. - 2296-7745.
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Tidskriftsartikel (refereegranskat)abstract
- Seaweed aquaculture can provide the growing human population with a sustainable source of proteins. Sea-based cultivation is an effective method for farming seaweeds on a large scale and can yield high biomass output. However, the quality and biochemical composition of the biomass is seasonally dependent, which limits the harvests to certain periods of the year. Here we show the possibility to extend the sea-based cultivation season of Ulva fenestrata when aiming for high protein levels, by post-harvest treatment in herring production process waters. We harvested U. fenestrata at an optimal period in terms of yield, but suboptimal in terms of protein content. We then cultivated the seaweed in onshore tank systems with the nutrient-rich process waters for 14 days. We monitored biomass yield, crude protein content, amino acid composition, and content of the health concerning metals arsenic, mercury, lead, and cadmium, as well as the sensory properties of the dried biomass. After cultivation in the process waters, biomass yields were 30 - 40% higher (210 – 230 g fresh weight) compared to in seawater (160 g fresh weight). Also, the crude protein and amino acid content increased three to five times in the process waters, reaching 12 - 17 and 15 – 21% dry weight, respectively. The protein enriched biomass followed food graded standards for heavy metal content, and consumption of the biomass does not exceed health based reference points. Additionally, no sensory attributes regarded as negative were found. This rapid, post-harvest treatment can help extend the cultivation season of sea-based seaweed farms, maximizing their output of sustainable proteins.
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| 2. |
- González García-Mon, Blanca, 1993-
(författare)
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Harvesting from land and sea : Social relationships, trade networks, and spatial connectivity in changing social-ecological systems
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In the era of global change, the connectivity of aquatic and terrestrial food production systems across spatial scales is increasing. At the same time, diverse actors that participate in food systems, from production to consumption, face the need to adapt their daily activities to an increasingly changing context. This thesis aims to better understand actors’ responses to social or environmental changes in food systems that are characterized by their cross-scale dynamics and social-ecological interactions. The four papers that constitute this thesis address this overarching aim by investigating two processes that are important in responding to changes and creating spatial connectivity between geographical locations: trade (Papers I-III), and spatial diversification or actor’s geographical mobility (Paper IV). The papers analyze fisheries and agricultural systems in Mexico and South Africa, using interview-based data collection and analysis, network analysis, agent-based modeling, and combinations of these methods. Papers I-III specifically examine how trade networks, which are embedded in social relationships and networks that operate across spatial scales, can influence the responses of food system actors to multiple types of changes. Paper I shows that trade relationships across fisheries and agricultural systems are generally embedded in stable business relationships characterized by reciprocity. Paper II finds that different trade network structures in a multi-species Mexican fishery can buffer changes in fish availability and create cascading effects between different species and geographical regions. Paper III describes four types of social networks consisting of relationships within and across scales that enable responding to multiple types of changes in a South African agricultural trade network. Paper IV identifies potential factors, such as environmental changes, that could influence changes in fisheries actors’ spatial diversification observed in Mexico. The thesis contributes to social-ecological systems research with theoretical insights regarding the embeddedness of trade networks in multidimensional social relationships within and across scales, where diverse types of social relationships and networks can influence fishing and farming practices. In addition, it highlights that spatial and temporal heterogeneity can have a key role in responses to changes based on spatial connectivity. Finally, the mixed-method methodology applied in this thesis enables simultaneously analyzing networks and processes in social-ecological systems, while illustrating the challenges and opportunities of method integration.
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| 3. |
- Stedt, Kristoffer, 1991, et al.
(författare)
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Cultivation of Ulva fenestrata using herring production process waters increases biomass yield and protein content
- 2022
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Ingår i: Frontiers in Marine Science. - : Frontiers Media SA. - 2296-7745. ; 9:988523
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Tidskriftsartikel (refereegranskat)abstract
- Ulva spp. (sea lettuce) has recently gained attention as a sustainable protein source due to its high productivity and many nutritional properties interesting for the food industry. In this study, we explored a possible industrial symbiosis between herring production processing industries and Ulva fenestrata cultivation. We show that U. fenestrata cultivated in herring production process waters had four to six times higher biomass yields (27.17 - 37.07 g fresh weight vs. 6.18 g fresh weight) and three times higher crude protein content (> 30% dry weight vs. 10% dry weight) compared to U. fenestrata cultivated in seawater. Along with the elevation of protein, the herring production process waters also significantly increased levels of all essential amino acids in the seaweed biomass. The content of some heavy metals (arsenic, mercury, lead, and cadmium) was well below the maximum allowed levels in foodstuff. Therefore, quantities of biomass around 100 g dry weight could be consumed daily following the US Environmental Protection Agency’s reference doses. Combined, the results show that cultivation of U. fenestrata in herring production process waters has great potential to produce sustainable proteins for the growing world population. At the same time, nutrients of currently discarded process waters are circulated back to the food chain.
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| 4. |
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Dietary reforms in the Baltic and East Central Europe, ca 1850–1950
- 2022
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Samlingsverk (redaktörskap) (refereegranskat)abstract
- In this special section, the histories of dietary reform have been approached and explored from different perspectives. The essays weave together threads of the history of dietary advice and nutritional standards with social history, women’s history and food history, covering the elements of life reform and women’s movements, the establishment of communist food ideology, the development of modern food safety and food security, etc. Three peer-reviewed articles focusing on the case studies of Estonia, Bulgaria and the Russian empire are built on previously untapped sources and offer original perspectives on the topic. As the contributions suggest, the entangled histories of dietary reform efforts proved to be a valuable and novel prism through which to study the region and the history of Europe in general.
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| 5. |
- Marklinder, Ingela, 1959-, et al.
(författare)
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A Structural Equation Model Demonstrating the Relationship between Food Safety Background, Knowledge, Attitudes and Behaviour among Swedish Students
- 2022
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Ingår i: Foods. - : MDPI. - 2304-8158. ; 11:11
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Tidskriftsartikel (refereegranskat)abstract
- Traditionally, food safety knowledge has been seen as a factor in improving food safety behaviour. However, the relationship between knowledge and behavior is complex. The aim of the present study was to investigate self-reported data from 408 university students regarding food safety background, knowledge, attitudes, and behaviour using Structural Equation Model (SEM) to examine the influence of different factors on food safety behaviour. The SEM was applied to four factors derived from the data: Background, Knowledge, Attitude and Behaviour. The novelty of this current investigation is the inclusion of the Background factor (genus; experience of cooking and handling different food items; experience of a food safety education course; the foremost sources of food safety knowledge). The factors were constructed from variables with sufficient factor loadings and set up in a predetermined structure confirmed to be valid in previous studies. The results, demonstrated as regression coefficients between factors, confirm that the Background factor strongly influenced Knowledge (0.842). The Knowledge factor, in turn, strongly affected Attitude (0.605), while it did not directly affect Behaviour (0.301) in the same way as Attitude. Attitude had a stronger influence on Behaviour (0.438) than Knowledge. Thus, the Attitude factor seemed to play a mediating role between Knowledge and Behaviour. This indicates that students ' attitudes towards the importance of food safety may have an impact on their food safety behavior, which should have implications for the development of food safety education. This warrants further investigation and practical development.
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| 6. |
- Song, Xiao, et al.
(författare)
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Food desires and hedonic discrimination in virtual reality varying in product–context appropriateness among older consumers
- 2022
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Ingår i: Foods. - : MDPI. - 2304-8158. ; 11:20
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Tidskriftsartikel (refereegranskat)abstract
- Immersive virtual reality (VR) videos can replicate complex real-life situations in a systematic, repeatable and versatile manner. New product development trajectories should consider the complexities of daily life eating situations. The creation of immersive contexts of a product with varying levels of appropriateness could be a useful tool for product developers in evaluating the extent to which context may influence food acceptance and eating behavior. This study explored virtual reality (VR) as an efficient context-enhancing technology through evaluations of protein-enriched rye breads and compared the effects of a VR-simulated congruent (VR restaurant) and incongruent (VR cinema) contexts on the acceptance in older consumers. A total of 70 participants were immersed in the two VR contexts and a neutral control context in a randomized order. The responses indicating the desire and liking for rye breads were measured, and the extent of immersion during context exposure was assessed by levels of the sense of presence and engagement. Immersive VR induced positive sensations of presence and a heightened level of engagement. The VR restaurant and neutral contexts were perceived as more appropriate for consuming rye breads and induced higher desire and liking for rye breads, which supported the notion of the alignment of congruent contexts with food desire and liking. The study provides new perspectives, practical methodologies, and discoveries in regard to the creation and application of VR-immersed contexts in food product evaluation. Moreover, it focused on a consumer segment (older consumers) that has seldom been investigated in previous relevant studies. The findings suggest that immersive VR technology, as a tool for evaluating contextual factors, is important for new product development. The good user experience among older consumers further indicated the potential value of VR as a context-enhancing tool for product development.
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| 7. |
- Mihnea, Mihaela, 1983-, et al.
(författare)
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Impact of panelist's age on the ease of swallow and sensory perception of texture-modified broccoli purees
- 2022
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Ingår i: Journal of sensory studies. - : John Wiley and Sons Inc. - 0887-8250 .- 1745-459X. ; 37:6
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Tidskriftsartikel (refereegranskat)abstract
- Swallowing disorders affect approximately 8% of the global population. It is more prevalent in the elderly, leading to malnutrition and dehydration. Different strategies have been investigated to design new texture-modified food products that would reduce or mitigate the suffering from these swallowing disorders. Despite the recent interest and research in this area, there are, however, still a lot of unknowns regarding the specific sensory insights by this targeted group. The aim of this work was to understand if the ease of swallow and related sensory characteristics are perceived differently by “young” and “elderly” healthy individuals. Broccoli purees with different textural properties were created by changing the fluid component (water or xanthan solution) or processing conditions. Samples were evaluated by an elderly panel (n = 19, average age = 68.9 years) and a young panel (n = 16, average age = 25.4 years). Multivariate data analysis strategies were used to understand the intrapanel sample discrimination and to compare between panels. Results showed a similar overall discrimination between samples between young and elderly panels. The use of xanthan improved the ease of swallow in both age groups. In the absence of xanthan gum, processing conditions determined the ease of swallow, which was related to the particle size distribution. Nevertheless, small differences were found between panels. For example, the elderly panel was more sensitive when discriminating samples based on the ease of swallow (p =.005). Therefore, panelist age seems to be relevant when designing tailored foods enhancing the ease of swallow for the elderly populations. Practical Applications: The present study highlights new insights on the relevance of age and sensory capabilities when designing new texture-modified food products. It also provides new insights regarding the key sensory attributes to consider and how these are affected by the type of food processing. © 2022 The Authors.
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| 8. |
- Karlsson, Therese, 1979, et al.
(författare)
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Identification of Single and Combined Serum Metabolites Associated with Food Intake
- 2022
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Ingår i: Metabolites. - : MDPI AG. - 2218-1989. ; 12:10
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Tidskriftsartikel (refereegranskat)abstract
- Assessment of dietary intake is challenging. Traditional methods suffer from both random and systematic errors; thus objective measures are important complements in monitoring dietary exposure. The study presented here aims to identify serum metabolites associated with reported food intake and to explore whether combinations of metabolites may improve predictive models. Fasting blood samples and a 4-day weighed food diary were collected from healthy Swedish subjects (n = 119) self-defined as having habitual vegan, vegetarian, vegetarian + fish, or omnivore diets. Serum was analyzed for metabolites by 1H-nuclear magnetic resonance spectroscopy. Associations between single and combined metabolites and 39 foods and food groups were explored. Area under the curve (AUC) was calculated for prediction models. In total, 24 foods or food groups associated with serum metabolites using the criteria of rho > 0.2, p < 0.01 and AUC ≥ 0.7 were identified. For the consumption of soybeans, citrus fruits and marmalade, nuts and almonds, green tea, red meat, poultry, total fish and shellfish, dairy, fermented dairy, cheese, eggs, and beer the final models included two or more metabolites. Our results indicate that a combination of metabolites improve the possibilities to use metabolites to identify several foods included in the current diet. Combined metabolite models should be confirmed in dose–response intervention studies.
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| 9. |
- Boonstra, Wiebren J., Dr. 1976-, et al.
(författare)
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Urban fishing reveals underrepresented diversity
- 2022
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Ingår i: Nature Food. - : Springer Science and Business Media LLC. - 2662-1355. ; 3
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 10. |
- Derakhshan, Arash, et al.
(författare)
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Association of per- and polyfluoroalkyl substances with thyroid homeostasis during pregnancy in the SELMA study
- 2022
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Ingår i: Environment International. - : Elsevier. - 0160-4120 .- 1873-6750. ; 167
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Tidskriftsartikel (refereegranskat)abstract
- ObjectivesTo investigate the association of exposure to per- and polyfluoroalkyl substances (PFAS) during early pregnancy with markers of the maternal thyroid system.MethodsSerum concentrations of seven PFAS as well as thyroid stimulating hormone (TSH), free and total thyroxine (FT4 and TT4), free and total triiodothyronine (FT3 and TT3) were measured in pregnant women in early pregnancy in the Swedish Environmental Longitudinal, Mother and child, Asthma and allergy (SELMA) study. Outcomes were concentrations of TSH and thyroid hormones, FT4/FT3 or TT4/TT3 ratios, TSH/FT4 ratio as a marker of the negative feedback loop, TT4/FT4 or TT3/FT3 ratios as markers of the binding of thyroid hormones to binding proteins.ResultsThe study population comprised 2,008 women with median (95% range) gestational age of 10 (6–14) weeks. There was no association between PFAS and TSH. Higher PFNA, PFDA, PFHpA and PFOA levels were associated with a higher FT4 (largest effect estimate for PFDA: β [95% CI]: 0.27 [0.10 to 0.45], P = 0.002). Higher PFUnDA levels, but no other PFAS, were associated with a lower FT3 (β [95% CI]: −0.05 [-0.09 to −0.01], P = 0.005). Higher PFUnDA levels were associated with lower TT4 (β [95% CI]: −1.58 [-3.07 to −0.09]) and there was an inverted U-shaped association of PFOS with TT4 (P = 0.03). Higher PFDA, PFUnDA, PFHpA levels were associated with a lower TT3. Overall, higher PFAS concentrations were associated with a higher FT4/FT3 ratio and a higher TT4/TT3 ratio. There was no association of PFAS with the TSH/FT4 ratio. Higher concentrations of several PFAS were associated with lower TT4/FT4 and TT3/FT3 ratios.ConclusionsThese findings translate results from experimental studies suggesting that exposure to PFAS may interfere with the thyroid system during pregnancy. Further experimental studies should take into account human evidence to better understand the potential underlying mechanisms of thyroid disruption by PFAS exposure.
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