Related content

  • CV
  • Publications

Biography Ragni Ofstad

I am a Senior Scientist in the departement 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. 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) and
took 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 Ofstad has 55 publications at Nofima:

Characterization of Collagen Structure in Normal, Wooden Breast and Spaghetti Meat Chicken Fillets by FTIR Microspectroscopy and Histology

Sanden, Karen Wahlstrøm; Böcker, Ulrike; Ofstad, Ragni; Pedersen, Mona Elisabeth; Høst, Vibeke; Afseth, Nils Kristian; Rønning, Sissel Beate; Pleshko, Nancy

2021

Academic article

Near-infrared spectroscopy detects woody breast syndrome in chicken fillets by the markers protein content and degree of water binding

Wold, Jens Petter; Måge, Ingrid; Løvland, Atle; Sanden, Karen Wahlstrøm; Ofstad, Ragni

2019

Academic article

FoodNexus Nordic. Next practices for entrepreneurship and innovation

Ofstad, Ragni (ed.); Ekstedt, Susanne (ed.)

2017

Report

Next practices for Education in a changing Food system

Ofstad, Ragni (ed.); Ekstedt, Susanne (ed.)

2017

Report

Effect of sodium bicarbonate and varying concentrations of sodium chloride in brine on the liquid retention of fish (Pollachius virens L.) muscle

Åsli, Magnus; Ofstad, Ragni; Böcker, Ulrike; Jessen, Flemming; Einen, Olai; Mørkøre, Turid

2016

Academic article

Low salt products Final report

Aursand, Ida Grong; Greiff, Kirsti; Erikson, Ulf Gøran; Gallart-Jornet, Lorena; Perisic, Nebojsa; Kohler, Achim; Afseth, Nils Kristian; Ofstad, Ragni; Storrø, Ivar; Josefsen, Kjell Domaas

2014

Report

Characterizing salt substitution in beef meat processing by vibrational spectroscopy and sensory analysis

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Narum, Bjørg; Kohler, Achim

2013

Academic article

FTIR Imaging for Structural Analysis of Frankfurter Sausages Subjected to Salt Reduction and Salt Substitution

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Scheel, Jan; Kohler, Achim

2013

Academic article

Characterising protein, salt and water interactions with combined vibrational spectroscopic techniques

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Hassani, Sahar; Kohler, Achim

2013

Academic article

Monitoring Protein Structural Changes and Hydration in Bovine Meat Tissue Due to Salt Substitutes by Fourier Transform Infrared (FTIR) Microspectroscopy

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim

2011

Academic article

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; Torstensen, Bente Elisabeth; Veiseth-Kent, Eva; Ruyter, Bente; Ofstad, Ragni; Thomassen, Magny S.

2010

Academic chapter/article/Conference paper

The effect of postmortem processing treatments on quality attributes of raw Atlantic salmon (Salmo salar) measured by sensory and instrumental methods

Veiseth-Kent, Eva; Hildrum, Kjell Ivar; Ofstad, Ragni; Rørå, Anna Maria Bencze; Lea, Per; Rødbotten, Marit

2010

Academic article

Relationship between muscle microstructure, the calpain system, and shear force in bovine longissimus dorsi muscle

Veiseth-Kent, Eva; Hollung, Kristin; Ofstad, Ragni; Aass, Laila; Hildrum, Kjell Ivar

2010

Academic article

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

Bahuaud, Diane; Mørkøre, Turid; Østbye, Tone-Kari K; Veiseth-Kent, Eva; Thomassen, Magny S.; Ofstad, Ragni

2010

Academic article

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.

Aursand, Ida Grong; Axelson, David; Veliyulin, Emil; Rustad, Turid; Böcker, Ulrike; Ofstad, Ragni; Erikson, Ulf Gøran

2009

Academic article

Noncontact Salt and Fat Distributional Analysis in Salted and Smoked Salmon Fillets Using X-ray Computed Tomography and NIR Interactance Imaging

Segtnan, Vegard; Høy, Martin; Sørheim, Oddvin; Kohler, Achim; Lundby, Frank; Wold, Jens petter; Ofstad, Ragni

2009

Academic article

Monitoring Secondary Structural Changes in Salted and Smoked Salmon Muscle Myofiber Proteins by FT-IR Microspectroscopy

Carton, Izaskun; Böcker, Ulrike; Ofstad, Ragni; Sørheim, Oddvin; Kohler, Achim

2009

Academic article

Atlantic salmon (Salmo salar) muscle structure integrity and lysosomal cathepsins B and L influenced by dietary n-6 and n-3 fatty acids

Bahuaud, Diane; Østbye, Tone-Kari K; Torstensen, Bente Elisabeth; Rørå, Mia B.; Ofstad, Ragni; Veiseth, Eva; Thomassen, Magny Skinlo; Ruyter, Bente

2009

Academic article

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

Aursand, Ida Grong; Veliyulin, Emil; Böcker, Ulrike; Ofstad, Ragni; Rustad, Turid; Erikson, Ulf

2009

Academic article

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 G.; Ofstad, Ragni

2008

Academic article

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

Academic article

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

Bahuaud, Diane; Mørkøre, Turid; Langsrud, Øyvind; Sinnes, K.; Veiseth, Eva; Ofstad, Ragni; Thomassen, Magny Skinlo

2008

Academic article

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; Wu, Zhiyun; Bertram, Hanne Christine; Sockalingum, Ganesh Dhruvananda; Manfait, Michel; Egelandsdal, Bjørg; Kohler, Achim

2007

Academic article

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

Wu, Zhiyun; Bertram, Hanne Christine; Böcker, Ulrike; Ofstad, Ragni; Kohler, Achim

2007

Academic article

Analyzing designed experiments with multiple responses

Langsrud, Øyvind; Jørgensen, Kjetil; Ofstad, Ragni; Næs, Tormod

2007

Academic article

Multivariate image analysis of a set of FTIR microspectroscopy images of aged bovine muscle tissue combining image and design information

Kohler, Achim; Bertrand, Dominique; Martens, Harald; Hannesson, K.O.; Kirschner, Carolin; Ofstad, Ragni

2007

Academic article

Revealing covariance structures in Fourier transform infrared and Raman microspectroscopy spectra: A study on pork muscle fiber tissue subjected to different processing parameters

Böcker, Ulrike; Ofstad, Ragni; Wu, Zhiyun; Bertram, Hanne; Sockalingum, Ganesh D.; Manfait, Michel; Egelandsdal, Bjørg; Kohler, Achim

2007

Academic article

Development of a novel fermented and dried saithe and salmon product

Nordvi, Berit; Egelandsdal, Bjørg; Langsrud, Øyvind; Ofstad, Ragni; Slinde, Erik

2007

Academic article

An immunological study of glycosaminoglycans in the connective tissue of bovine and cod skeletal muscle

Hannesson, Kirsten; Tingbø, Monica Gausdal; Olsen, Ragnar Ludvig; Enersen, Grethe; Bævre, Anne Birgit; Ofstad, Ragni

2007

Academic article

Heat-induced changes in myofibrillar protein structures and myowater of two pork qualities. A combined FT-IR spectroscopy and low-field NMR relaxometry study

Bertram, Hanne Christine; Kohler, Achim; Böcker, Ulrike; Ofstad, Ragni; Andersen, HJ

2006

Academic article

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

Wu, Zhiyun; Bertram, Hanne Christine; Kohler, Achim; Böcker, Ulrike; Ofstad, Ragni; Andersen, Henrik J.

2006

Academic article

Development of a novel, fermented and dried saithe and salmon product

Nordvi, Berit; Egelandsdal, Bjørg; Langsrud, Øyvind; Ofstad, Ragni; Slinde, Erik

2006

Academic article

Salt-induced changes in pork myofibrillar tissue investigated by FT-IR microspectroscopy and light microscopy

Böcker, Ulrike; Ofstad, Ragni; Bertram, Hanne; Egelandsdal, Bjørg; Kohler, Achim

2006

Academic article

Breakdown of intramuscular connective tissue in cod (Gadus morhua L.) and spotted wolffish (Anarhichas minor O.) related to gaping

Ofstad, Ragni; Olsen, Ragnar Ludvig; Taylor, Richard; Hannesson, Kirsten

2006

Academic article

Identification and distribution of heparan sulfate proteoglycans in the white muscle of Atlantic cod (Gadus morhua) and spotted wolffish (Anarhichas minor)

Tingbø, Monica Gausdal; Kolset, Svein Olav; Ofstad, Ragni; Enersen, Grethe; Hannesson, Kirsten O.

2006

Academic article

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

Academic article

Sulfated glycosaminoglycans in the extracellular matrix of muscle tissue in Atlantic cod (Gadus morhua) and Spotted wolffish (Anarhichas minor)

Tingbø, Monica Gausdal; Kolset, Svein Olav; Ofstad, Ragni; Enersen, Grethe; Hannesson, Kirsten O.

2005

Academic article

Microstructure of heat processed whey protein food emulsions and growth of shear-induced cracks during cooling

Ofstad, Ragni; Langsrud, Øyvind; Høst, Vibeke; Enersen, Grethe; Willers, Ene; Norvi, Berit; Egelandsdal, Bjørg

2005

Academic article

Effects of carbon dioxide on yield, texture and microstructure of cooked ground beef

Sørheim, Oddvin; Ofstad, Ragni; Lea, Per

2004

Academic article

Monitoring of denaturation processes in aged beef loin by FT-IR microspectroscopy

Kirschner, C.; Ofstad, Ragni; Skarpeid, Hans Jakob; Høst, Vibeke; Kohler, Achim

2004

Academic article

Identification of fat, protein matrix, and water/starch on microscopy images of sausages by a principal component analysis-based segmentation scheme

Kohler, Achim; Høst, Vibeke; Enersen, Grethe; Ofstad, Ragni

2003

Academic article

Breakdown of large proteoglycans in bovine intramuscular connective tissue early postmortem

Hannesson, KO; Pedersen, Mona Elisabeth; Ofstad, Ragni; Kolset, Svein Olav

2003

Academic article

Changes in water-holding capacity of halibut muscle during cold storage

Olsson, Gunn Berit; Ofstad, Ragni; Lødemel, Jørgen Blikra; Olsen, Ragnar Ludvig

2003

Academic article

Post-mortem structural characteristics and water-holding capacity in Atlantic halibut muscle

Olsson, Gunn Berit; Olsen, Ragnar Ludvig; Ofstad, Ragni

2003

Academic article

Seasonal variations in chemical and sensory characteristics of farmed and wild Atlantic halibut (Hippoglossus hippoglossus)

Olsson, Gunn Berit; Olsen, Ragnar Ludvig; Carlehög, Mats; Ofstad, Ragni

2003

Academic article

Statistisk metodikk for å lage robuste produktresepter gjennom optimal prosessering og effektiv råvareutnyttelse i næringsmiddelindustrien

Egelandsdal, Bjørg; Solheim, Ragnhild; Berget, Ingunn; Dingstad, Gunvor; Langsrud, Øyvind; Magnus, Ellen Merethe; Ofstad, Ragni; Baardseth, Pernille; Westad, Frank; Tøgersen, Geir; Arneberg, Per; Haugdal, Janne; Strande, Svein Erik

2003

Article in business/trade/industry journal

Consumer discrimination of rancidity in pork loin chops and pork sausages

Bryhni, Eli Arnkværn; Hunt, M.C.; Ofstad, Ragni

2002

Academic article

Polyunsaturated fat and fish oil in diets for growing-finishing pigs: Effects on fatty acid composition and meat, fat, and sausage quality

Bryhni, Eli Arnkværn; Kjos, Nils Petter; Ofstad, Ragni; Hunt, Melvin

2002

Academic article

Image analysis of particle dispersions in microscopy images of cryo-sectioned sausages

Kohler, Achim; Høst, Vibeke; Ofstad, Ragni

2001

Academic article

Estimating significant causes of variation in emulsion's droplet size distributions obtained by the electrical sensing zone and laser low angle light scattering technique

Egelandsdal, Bjørg; Langsrud, Øyvind; Nyvold, Tone; Sontum, Per kristian; Enersen, Grethe; Hølland, Sigurd; Ofstad, Ragni; Sørensen, Charlotte

2001

Academic article

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

Martinez, Iciar; Solberg, Christel; Lauritzen, Kristin; Ofstad, Ragni

1992

Academic article

Partial least squares evaluation of the influence of calcium and magnesium on functional properties of washed fish mince (surimi)

Solberg, Terje; Grahl-Madsen, Elisabeth; Gundersen, Bjørn; Solberg, Christel; Ofstad, Ragni

1992

Academic article

Surimi from blue whiting (Micromesistius poutassou) produced on board m/s Uksnøy: process and quality

Ofstad, Ragni; Grahl-Madsen, Elisabeth; Solberg, Christel; Burt, J.R.; Hardy, R.; Whittle, K.J.

1992

Academic chapter/article/Conference paper

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

Martinez, iciar; Christiansen, Jørgen Schou; Ofstad, Ragni; Olsen, Ragnar Ludvig

1991

Academic article

Kolmulesurimi : prosess og kvalitet

Ofstad, Ragni; Grahl-Madsen, Elisabeth; Solberg, Christel

1990

Report