Related content

  • CV
  • Scientific publications
  • Other publications

Biography Ragni Ofstad

I am a leader of the raw material and process optimization. This competence includes raw material knowledge, rapid and advanced measurement methods (biospektroscopy) and multivariate statistics and data modeling. I have also studied management at BI. I was hired as a researcher at Fiskeriforskning, now Nofima, in 1981, and since 2005 I have held various leadership positions at Matforsk, now Nofima Mat. My area of ??expertise is how the structure (morphology)and structural changes of muscle of meat and fish are important for tenderness, texture and water binding. I have worked with various microscopic techniques and the use of imaging spectroscopy (micro-FTIR). I am a graduate of the Norwegian University of Science and Technology (NTNU) andtook my doctoral degree at the Norwegian Arctic University on water binding properties and muscle microstructure in 1995. The doctorate was partially conducted at SIK, Gothenburg. I have mainly worked with fish, but also have good knowledge on meat products. I have also experience of Mills DA as Director for Innovation for 2 years and I have worked one year as a visiting researcher at INRA in France. Research policy assignments: -Member of Norwegian Research Council reference group for H2020 (SC2); – Member of the steering committee of the National Technology Platform- Food for Life – Chair of working panel-Seafood, Hav21 (Strategies for Seafood research) -Appointment of professor at Swedish university of Agricultural Sciences, SLU. -Membe

Ragni has 48 scientific publications in Cristin:

Åsli, Magnus; Ofstad, Ragni; Böcker, Ulrike; Jessen, Flemming; Einen, Olai; Mørkøre, Turid; 2016: Effect of sodium bicarbonate and varying concentrations of sodium chloride in brine on the liquid retention of fish (Pollachius virens L.) muscle

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Hassani, Sahar; Kohler, Achim; 2013: Characterising protein, salt and water interactions with combined vibrational spectroscopic techniques

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Nilsen, Bjørg Narum; Kohler, Achim; 2013: Characterizing salt substitution in beef meat processing by vibrational spectroscopy and sensory analysis

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Scheel, Jan; Kohler, Achim; 2013: FTIR Imaging for Structural Analysis of Frankfurter Sausages Subjected to Salt Reduction and Salt Substitution

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim; 2011: Monitoring Protein Structural Changes and Hydration in Bovine Meat Tissue Due to Salt Substitutes by Fourier Transform Infrared (FTIR) Microspectroscopy

Bahuaud, Diane; Mørkøre, Turid; Østbye, Tone-Kari K; Torstensen, Bente Elisabeth; Veiseth, Eva; Ruyter, Bente; Ofstad, Ragni; Thomassen, Magny S.; 2010: Atlantic salmon (Salmo salar L.) flesh quality - role of lysosomal cathepsins B and L in muscle degradation

Bahuaud, Diane; Mørkøre, Turid; Østbye, Tone-Kari K; Veiseth, Eva; Thomassen, Magny S.; Ofstad, Ragni; 2010: Muscle structure responses and lysosomal cathepsins B and L in farmed Atlantic salmon (Salmo salar L.) pre- and post-rigor fillets exposed to short and long-term crowding stress

Veiseth, Eva; Hildrum, Kjell Ivar; Ofstad, Ragni; Rørå, Anna Maria Bencze; Lea, Per; Rødbotten, Marit; 2010: The effect of postmortem processing treatments on quality attributes of raw Atlantic salmon (Salmo salar) measured by sensory and instrumental methods

Veiseth, Eva; Hollung, Kristin; Ofstad, Ragni; Aass, Laila; Hildrum, Kjell Ivar; 2010: Relationship between muscle microstructure, the calpain system, and shear force in bovine longissimus dorsi muscle

Aursand, Ida Grong; Veliyulin, Emil; Böcker, Ulrike; Ofstad, Ragni; Rustad, Turid; Erikson, Ulf; 2009: Water and Salt Distribution in Atlantic Salmon (Salmo salar) Studied by Low-Field H-1 NMR, H-1 and Na-23 MRI and Light Microscopy: Effects of Raw Material Quality and Brine Salting

Bahuaud, Diane; Østbye, Tone-Kari K; Torstensen, Bente Elisabeth; Rørå, Anna Maria Bencze; Ofstad, Ragni; Veiseth, Eva; Thomassen, Magny S.; Ruyter, Bente; 2009: Atlantic salmon (Salmo salar) muscle structure integrity and lysosomal cathepsins B and L influenced by dietary n-6 and n-3 fatty acids

Carton, Izaskun; Böcker, Ulrike; Ofstad, Ragni; Sørheim, Oddvin; Kohler, Achim; 2009: Monitoring Secondary Structural Changes in Salted and Smoked Salmon Muscle Myofiber Proteins by FT-IR Microspectroscopy

Segtnan, Vegard; Høy, Martin; Sørheim, Oddvin; Kohler, Achim; Lundby, Frank; Wold, Jens Petter; Ofstad, Ragni; 2009: Noncontact Salt and Fat Distributional Analysis in Salted and Smoked Salmon Fillets Using X-ray Computed Tomography and NIR Interactance Imaging

Aursand, Ida Grong; Axelson, David; Veliyulin, Emil; Rustad, Turid; Böcker, Ulrike; Ofstad, Ragni; Erikson, Ulf Gøran; 2009: Water and salt distribution in Atlantic salmon (Salmo salar) studied by low-field NMR T2 relaxation, 1H/23Na MR imaging and light microscopy - Effects of raw material quality and brine salting.

Bahuaud, Diane; Mørkøre, Turid; Langsrud, Øyvind; Sinnes, K.; Veiseth, E.; Ofstad, Ragni; Thomassen, Magny S.; Veiseth, Eva; 2008: Effects of -1.5 degrees C Super-chilling on quality of Atlantic salmon (Salmo salar) pre-rigor Fillets: Cathepsin activity, muscle histology, texture and liquid leakage

Böcker, Ulrike; Böcker, Ulrike; Kohler, Achim; Aursand, Ida G.; Ofstad, Ragni; 2008: Effects of brine salting with regard to raw material variation of Atlantic salmon (Salmo salar) muscle investigated by Fourier transform infrared microspectroscopy

Böcker, Ulrike; Kohler, Achim; Aursand, Ida Grong; Ofstad, Ragni; 2008: Effects of brine salting with regard to raw material variation of Atlantic salmon (Salmo salar) muscle investigated by Fourier transform infrared microspectroscopy

Böcker, Ulrike; Böcker, Ulrike; Ofstad, Ragni; Wu, Zhiyun; Bertram, Hanne; Sockalingum, Ganesh D.; Manfait, Michel; Egelandsdal, Bjørg; Kohler, Achim; Kohler, Achim; 2007: Revealing covariance structures in Fourier transform infrared and Raman microspectroscopy spectra: A study on pork muscle fiber tissue subjected to different processing parameters

Hannesson, Kirsten; Tingbø, Monica G.; Tingbø, Monica Gausdal; Olsen, Ragnar Ludvig; Enersen, Grethe; Bævre, Anne Birgit; Ofstad, Ragni; 2007: An immunological study of glycosaminoglycans in the connective tissue of bovine and cod skeletal muscle

Kohler, Achim; Bertrand, Dominique; Martens, Harald; Hannesson, K.O.; Kirschner, Carolin; Ofstad, Ragni; 2007: Multivariate image analysis of a set of FTIR microspectroscopy images of aged bovine muscle tissue combining image and design information

Langsrud, Øyvind; Jørgensen, Kjetil; Ofstad, Ragni; Næs, Tormod; 2007: Analyzing designed experiments with multiple responses

Nordvi, Berit; Egelandsdal, Bjørg; Langsrud, Øyvind; Ofstad, Ragni; Slinde, Erik; 2007: Development of a novel fermented and dried saithe and salmon product

Wu, Zhiyun; Bertram, Hanne Christine; Böcker, Ulrike; Ofstad, Ragni; Kohler, Achim; 2007: Myowater dynamics and protein secondary structural changes as affected by heating rate in three pork qualities: A combined FT-IR microspectroscopic and 1H NMR relaxometry study

Böcker, Ulrike; Ofstad, Ragni; Wu, Zhiyun; Bertram, Hanne Christine; Sockalingum, Ganesh Dhruvananda; Manfait, Michel; Egelandsdal, Bjørg; Kohler, Achim; 2007: Revealing covariance structures in FT-IR and Raman microspectroscopy spectra - A study on pork muscle fiber tissue subjected to different processing parameters

Böcker, Ulrike; Ofstad, Ragni; Bertram, Hanne; Egelandsdal, Bjørg; Kohler, Achim; 2006: Salt-induced changes in pork myofibrillar tissue investigated by FT-IR microspectroscopy and light microscopy

Nordvi, Berit; Egelandsdal, Bjørg; Langsrud, Øyvind; Ofstad, Ragni; Slinde, Erik; 2006: Development of a novel, fermented and dried saithe and salmon product

Ofstad, Ragni; Olsen, Ragnar Ludvig; Taylor, Richard; Hannesson, Kirsten; 2006: Breakdown of intramuscular connective tissue in cod (Gadus morhua L.) and spotted wolffish (Anarhichas minor O.) related to gaping

Tingbø, Monica Gausdal; Kolset, Svein Olav; Ofstad, Ragni; Enersen, Grethe; Hannesson, Kirsten O.; 2006: Identification and distribution of heparan sulfate proteoglycans in the white muscle of Atlantic cod (Gadus morhua) and spotted wolffish (Anarhichas minor)

Wu, Zhiyun; Bertram, Hanne Christine; Kohler, Achim; Böcker, Ulrike; Ofstad, Ragni; Andersen, Henrik J.; 2006: Influence of aging and salting on protein secondary structures and water distribution in uncooked and cooked pork. A combined FT-IR microspectroscopy and H-1 NMR relaxometry study

Bertram, Hanne Christine; Kohler, A; Kohler, Achim; Böcker, Ulrike; Ofstad, Ragni; Andersen, HJ; 2006: Heat-induced changes in myofibrillar protein structures and myowater of two pork qualities. A combined FT-IR spectroscopy and low-field NMR relaxometry study

Ofstad, Ragni; Langsrud, Øyvind; Høst, Vibeke; Høst, Vibeke; Enersen, Grethe; Enersen, Grethe; Willers, Ene; Norvi, Berit; Egelandsdal, Bjørg; 2005: Microstructure of heat processed whey protein food emulsions and growth of shear-induced cracks during cooling

Ofstad, Ragni; Langsrud, Øyvind; Nyvold, Tone; Enersen, Grethe; Høst, Vibeke; Willers, Ene; Nordvi, Berit; Egelandsdal, Bjørg; 2005: Heat processed whey-protein food emulsions and growth of shear-induced cracks during cooling

Tingbø, Monica Gausdal; Kolset, Svein Olav; Ofstad, Ragni; Enersen, Grethe; Hannesson, Kirsten O.; 2005: Sulfated glycosaminoglycans in the extracellular matrix of muscle tissue in Atlantic cod (Gadus morhua) and Spotted wolffish (Anarhichas minor)

Kirschner, C.; Ofstad, Ragni; Skarpeid, Hans Jakob; Høst, Vibeke; Kohler, Achim; 2004: Monitoring of denaturation processes in aged beef loin by FT-IR microspectroscopy

Sørheim, Oddvin; Ofstad, Ragni; Lea, Per; 2004: Effects of carbon dioxide on yield, texture and microstructure of cooked ground beef

Hannesson, KO; Pedersen, ME; Pedersen, Mona Elisabeth; Ofstad, Ragni; Kolset, Svein Olav; 2003: Breakdown of large proteoglycans in bovine intramuscular connective tissue early postmortem

Kohler, Achim; Høst, Vibeke; Enersen, Grethe; Ofstad, Ragni; 2003: Identification of fat, protein matrix, and water/starch on microscopy images of sausages by a principal component analysis-based segmentation scheme

Olsson, Gunn Berit; Ofstad, Ragni; Lødemel, Jørgen Blikra; Olsen, Ragnar Ludvig; 2003: Changes in water-holding capacity of halibut muscle during cold storage

Olsson, Gunn Berit; Olsen, Ragnar Ludvig; Carlehög, Mats; Ofstad, Ragni; 2003: Seasonal variations in chemical and sensory characteristics of farmed and wild Atlantic halibut (Hippoglossus hippoglossus)

Olsson, Gunn Berit; Olsen, Ragnar Ludvig; Ofstad, Ragni; 2003: Post-mortem structural characteristics and water-holding capacity in Atlantic halibut muscle

Bryhni, Eli Arnkværn; Hunt, M.C.; Ofstad, Ragni; 2002: Consumer discrimination of rancidity in pork loin chops and pork sausages

Bryhni, Eli Arnkværn; Kjos, Nils Petter; Ofstad, Ragni; Hunt, Melvin; 2002: Polyunsaturated fat and fish oil in diets for growing-finishing pigs: Effects on fatty acid composition and meat, fat, and sausage quality

Egelandsdal, Bjørg; Langsrud, Øyvind; Nyvold, Tone; Sontum, Per kristian; Sørensen, Charlotte; Enersen, Grethe; Hølland, Sigurd; Ofstad, Ragni; Sørensen, Charlotte; 2001: Estimating significant causes of variation in emulsion's droplet size distributions obtained by the electrical sensing zone and laser low angle light scattering technique

Kohler, Achim; Høst, Vibeke; Ofstad, Ragni; 2001: Image analysis of particle dispersions in microscopy images of cryo-sectioned sausages

Martinez, Iciar; Solberg, Christel; Lauritzen, Kristin; Ofstad, Ragni; 1992: Two-dimensional electrophoretic analyses of cod (Gadus morhua, L.) whole muscle proteins, water-soluble fraction and surimi. Effect of the addition of CaCl2 and MgCl2 during the washing procedure

Ofstad, Ragni; Grahl-Madsen, Elisabeth; Solberg, Christel; Burt, J.R.; Hardy, R.; Whittle, K.J.; 1992: Surimi from blue whiting (Micromesistius poutassou) produced on board m/s Uksnøy: process and quality

Solberg, Terje; Grahl-Madsen, Elisabeth; Gundersen, Bjørn; Gundersen, Bjørn; Solberg, Christel; Solberg, Christel; Ofstad, Ragni; 1992: Partial least squares evaluation of the influence of calcium and magnesium on functional properties of washed fish mince (surimi)

Martinez, Iciar; Christiansen, Jørgen Schou; Ofstad, Ragni; Olsen, Ragnar Ludvig; 1991: Comparison of myosin isoenzymes present in skeletal and cardiac muscles of Arctic charr Salvelinus alpinus (L.) Sequential expression of different myosin heavy chains during development of the fast white skeletal muscle