English
norskBlar i forfatter "Svenning, Jon Brage"
Viser treff 1-12 av 12
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Co-products from the Atlantic salmon filleting industry – Their properties, stability and potential as human food ingredients
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-03-20)The present study impacts the growing knowledge about co-products obtained from the primary processing of Atlantic salmon (Salmo Salar L.) as food ingredients by highlighting their microbial and chemical composition and stability. The proximate composition varied between the co-products from the fatty belly-flap (34% lipid, 15% protein) to the leaner deboned meat (10% fat, 22% protein) (p < 0.001), ... -
In vitro intestinal digestion of lipids from the marine diatom Porosira glacialis compared to commercial LC n-3 PUFA products
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-09)Marine sources of long chain omega-3 polyunsaturated fatty acids (LC n-3 PUFA) are in high demand for use in health supplements. Mass cultivated marine microalgae is a promising and sustainable source of LC n-3 PUFA, which relieves pressure on natural fish stocks. The lipid class profile from cultivated photosynthetic algae differ from the marine organisms currently used for the production of LC n-3 ... -
Inclusion of photoautotrophic cultivated diatom biomass in salmon feed can deter lice
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-07-29)The aim of this study was to evaluate the potential of diatom (microalgae) biomass as a lice-reducing ingredient in salmon feed. The original hypothesis was based on the fact that polyunsaturated aldehydes (PUAs), e.g. 2-trans, 4-trans decadenial (A3) produced by diatoms can function as grazing deterrents and harm copepod development. Salmon lice (Lepeophtheirus salmonis) is a copepod, and we intended ... -
Lipid content, composition and dynamics in northern marine diatoms. An experimental study using different analytical methods
(Master thesis; Mastergradsoppgave, 2014-11-20)In this study, the fluorophore Nile Red was used as a probe for lipid accumulation during nutrient stress in the diatom Coscinodiscus concinnus, and to quantify lipid concentration fluorometrically in 5 monocultures of northern diatoms. The results from the fluorometrical quantification were validated by solvent extraction and HPLC-MS analysis in Bergen. In addition, 17 monocultures of 7 species of ... -
Lipid yield from the diatom Porosira glacialis is determined by solvent choice and number of extractions, independent of cell disruption
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-17)Cell wall disruption is necessary to maximize lipid extraction yields in conventional species of mass-cultivated microalgae. This study investigated the effect of sonication, solvent choice and number of extractions on the lipid yield, lipid class composition and fatty acid composition of the diatom <i>Porosira glacialis</i>. For comparison, the diatom <i>Odontella aurita</i> and green alga <i>Chlorella ... -
Mass Cultivation of Microalgae: I. Experiences with Vertical Column Airlift Photobioreactors, Diatoms and CO2 Sequestration
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-17)From 2015 to 2021, we optimized mass cultivation of diatoms in our own developed vertical column airlift photobioreactors using natural and artificial light (LEDs). The project took place at the ferrosilicon producer Finnfjord AS in North Norway as a joint venture with UiT—The Arctic University of Norway. Small (0.1–6–14 m<sup>3</sup>) reactors were used for initial experiments and to produce inoculum ... -
Microbial Community Dynamics during a Harmful Chrysochromulina leadbeateri Bloom in Northern Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-01-09)A harmful algal bloom occurred in late spring 2019 across multiple, interconnected fjords and bays in northern Norway. The event was caused by the haptophyte Chrysochromulina leadbeateri and led to severe fish mortality at several salmon aquaculture facilities. This study reports on the spatial and temporal succession dynamics of the holistic marine microbiome associated with this bloom by relating ... -
Mikroalger i fôr, ny løsning for å redusere lusepåslag på laks – Faglig sluttrapport
(Research report; Forskningsrapport, 2020-05)I dette prosjektet har vi testet ut en hypotese om at ved å erstatte vegetabilske oljer i fôr til oppdrettslaks med marine oljer, vil man kunne redusere lusepåslag hos laks. Vi har fôret laks med fire ulike fôr, der proteininnholdet er det samme, men oljen er variert. De ulike fôrene vi brukte var kontrollfôr som var standardfôr med vegetabilsk olje, og tre ulike testfôr der vegetabilsk olje ble ... -
Miljøundersøkelse i vannforekomsten Finnfjord Indre i Lenvik Kommune, Troms fylke.
(Research report; Forskningsrapport, 2016)Miljødirektoratet påla i mai 2015 Finnfjord AS og andre industribedrifter å gjennomføre vannovervåking i vannforekomsten bedriftene har utslipp til. Finnfjord AS engasjerte Akvaplan Niva AS til å utarbeide et program for miljøundersøkelse i vannforekomsten Finnfjorden Indre.(Akvaplan-niva AS Rapport: 7386-01). Programmet ble akseptert av Miljødirektoratet ... -
Stability of lipids during wet storage of the marine diatom Porosira glacialis under semi-preserved conditions at 4 and 20 °C
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-17)Cultivation of diatoms may help alleviate the pressure on wild fish stocks for marine nutrient availability in aquaculture feed and for human consumption. However, the lipids in microalgae biomass are easily deteriorated, both trough lipolysis and degradation of polyunsaturated fatty acids (PUFA). Proper storage conditions are therefore necessary to maintain the lipid quality. Additionally, the ... -
Temperature dependent growth rate, lipid content and fatty acid composition of the marine cold-water diatom Porosira glacialis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-27)In this study, the northern cold-water marine diatom <i>Porosira glacialis</i> was cultivated in a pilot-scale mass cultivation system at 5 different temperatures (−2 to 12 °C), in order to evaluate temperature-dependent growth rate (in vitro Chl <i>a</i>), lipid content (Folch's method) and fatty acid (FA) composition (GC–MS) in the exponential growth phase. We found that <i>P. glacialis</i> has a ... -
Towards mass cultivation of diatoms as a source of marine lipids
(Doctoral thesis; Doktorgradsavhandling, 2021-04-23)The global demand for the long-chain omega-3 fatty acids EPA and DHA is increasing, and the traditional sources of these fatty acids, fish oils, are no longer able to sustain the demand. This shortage is mainly a result of the surging requirement of EPA and DHA as ingredients in fish feed for aquaculture, and as dietary supplements for human consumption. As a result, there is an increased interest ...
