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Biography Nils Kristian Afseth

My work as a PhD student covers the fields of spectroscopy, chemometrics and chemistry. The PhD research project wears the working title ”Spectroscopy for the rapid analysis of foods”, lies within the Matforsk project ”Effective assessment of food quality by rapid spectroscopic and sensor techniques”, and is performed under the strict supervision of Vegard Segtnan, Jens Petter Wold and Tomas Isaksson. The PhD research project serves several aims. I mainly work with spectroscopic techniques like Near-Infrared, Infrared and Raman spectroscopy and compare these techniques used as rapid and non-destructive methods for analysing interesting components of various kinds of food systems. In addition I try to combine various chemometric techniqueswith basic knowledge about the spectroscopic methods and the chemistry of the specific food systems to assure robust and quantitative descriptions of the components of interest. So far I have used quite a bit of time working with Raman spectroscopy. The theory of Raman scattering has been known for about 80 years, but not until recent years the Raman instruments have grown to be robust, less expensive and thus more available for both research and industry. The technique is rapid, the need for sample preparation is minimal, and molecular vibrations due to water do not dominate in Raman spectra like they often do in Near-Infrared and Infrared spectra. However, issues related to sensitivity and interfering physical features often provide cha

Nils Kristian Afseth has 70 publications at Nofima:

Fourier-transform infrared spectroscopy for monitoring proteolytic reactions using dry-films treated with trifluoroacetic acid

Kristoffersen, Kenneth Aase; van Amerongen, Aart; Böcker, Ulrike; Lindberg, Diana; Wubshet, Sileshi Gizachew; de Vogel-van den Bosch, Heleen; Horn, Svein Jarle; Afseth, Nils Kristian

2020

Average molecular weight, degree of hydrolysis and dry-film FTIR fingerprint of milk protein hydrolysates: Intercorrelation and application in process monitoring.

Kristoffersen, Kenneth Aase; Afseth, Nils Kristian; Böcker, Ulrike; Lindberg, Diana; de Vogel-van den Bosch, Heleen; Ruud, Mari Linnea; Wubshet, Sileshi Gizachew

2020

The use of Fourier‐transform infrared spectroscopy to characterize connective tissue components in skeletal muscle of Atlantic cod (Gadus morhua L.).

Sanden, Karen Wahlstrøm; Kohler, Achim; Afseth, Nils Kristian; Böcker, Ulrike; Rønning, Sissel Beate; Liland, Kristian Hovde; Pedersen, Mona Elisabeth

2019

FTIR-based hierarchical modeling for prediction of average molecular weights of protein hydrolysates

Kristoffersen, Kenneth Aase; Liland, Kristian Hovde; Böcker, Ulrike; Wubshet, Sileshi Gizachew; Lindberg, Diana; Horn, Svein Jarle; Afseth, Nils Kristian

2019

Chapter 8 - Bioanalytical Aspects in Enzymatic Protein Hydrolysis of By-Products

Wubshet, Sileshi Gizachew; Lindberg, Diana; Veiseth-Kent, Eva; Kristoffersen, Kenneth Aase; Böcker, Ulrike; Washburn, Kathryn E.; Afseth, Nils Kristian

2019

Peptides from chicken processing by-product inhibit DPP-IV and promote cellular glucose uptake: potential ingredients for T2D management

Lemos Lima, Rita de Cássia; Berg, Ragnhild Stenberg; Rønning, Sissel Beate; Afseth, Nils Kristian; Knutsen, Svein Halvor; Staerk, Dan; Wubshet, Sileshi Gizachew

2019

Visualizing indirect correlations when predicting fatty acid composition from near infrared spectroscopy measurements

Eskildsen, Carl Emil Aae; Næs, Tormod; Wold, Jens Petter; Afseth, Nils Kristian; Engelsen, Søren Balling

2019

Increased release of carotenoids and delayed in vitro lipid digestion of high pressure homogenized tomato and pepper emulsions

Kirkhus, Bente; Afseth, Nils Kristian; Borge, Grethe Iren Andersen; Grimsby, Gard Sveinung; Steppeler, Christina; Krona, Annika; Langton, Maud

2019

Non-destructive Raman spectroscopy as a tool for measuring ASTA color values and Sudan I content in paprika powder

Monago-Maraña, Olga; Eskildsen, Carl Emil Aae; Afseth, Nils Kristian; Galeano-Díaz, Teresa; de la Pena, Arsenio Muñoz; Wold, Jens Petter

2019

Raman spectroscopy for quantification of residual calcium and total ash in mechanically deboned chicken meat

Wubshet, Sileshi Gizachew; Wold, Jens Petter; Böcker, Ulrike; Sanden, Karen Wahlstrøm; Afseth, Nils Kristian

2019

Assessment of fecal near-infrared spectroscopy to predict feces chemical composition and apparent total-tract digestibility of nutrients in pigs

Nirea, Kahsay Gebremariam; Perez de Nanclares Fernandez, Marta; Skugor, Adrijana; Afseth, Nils Kristian; Meuwissen, Theo; Hansen, Jon Øvrum; Mydland, Liv Torunn; Øverland, Margareth

2018

Feed-Forward Prediction of Product Qualities in Enzymatic Protein Hydrolysis of Poultry By-Products: a Spectroscopic Approach

Wubshet, Sileshi Gizachew; Wold, Jens Petter; Afseth, Nils Kristian; Böcker, Ulrike; Lindberg, Diana; Ihunegbo, Felicia Nkem; Måge, Ingrid

2018

Pretreatment of different food rest materials for bioconversion into fungal lipid-rich biomass

Tzimorotas, Dimitrios; Afseth, Nils Kristian; Lindberg, Diana; Kjørlaug, Oda Marie; Axelsson, Lars; Shapaval, Volha

2018

Assessment of the scalability of a microtiter plate system for screening of oleaginous microorganisms

Kòsa, Gergely; Vuoristo, Kiira; Horn, Svein Jarle; Zimmermann, Boris; Afseth, Nils Kristian; Kohler, Achim; Shapaval, Volha

2018

High-throughput screening of Mucoromycota fungi for production of low- and high-value lipids

Kosa, Gergely; Zimmermann, Boris; Kohler, Achim; Ekeberg, Dag; Afseth, Nils Kristian; Mounier, Jerome; Shapaval, Volha

2018

Ultrasensitive detection of phenolic antioxidants by surface enhanced Raman spectroscopy

Ornelas-Soto, Nancy; Aguilar-Hernández, Iris; Afseth, Nils Kristian; López-Luke, Tzarara; Contreras-Torres, Flavio F.; Wold, Jens Petter

2017

Sluttrapport for prosjekt: Økt konkurransekraft for norske poteter (2013-2017). Internt dokument til referansegruppa

Molteberg, Eldrid Lein; Johansen, Tor Jacob; Eikemo, Håvard; Afseth, Nils Kristian; Ballance, Simon

2017

Peptide recovery and commercialization by enzymatic hydrolysis of marine biomass

Vang, Birthe; Altintzoglou, Themistoklis; Måge, Ingrid; Wubshet, Sileshi Gizachew; Afseth, Nils Kristian; Whitaker, Ragnhild

2017

Valorization of Proteins from Co- and By-Products from the Fish and Meat Industry

Aspevik, Tone; Oterhals, Åge; Rønning, Sissel Beate; Altintzoglou, Themistoklis; Wubshet, Sileshi Gizachew; Gildberg, Asbjørn; Afseth, Nils Kristian; Whitaker, Ragnhild; Lindberg, Diana

2017

Fourier-transform infrared spectroscopy for characterization of protein chain reductions in enzymatic reactions

Böcker, Ulrike; Wubshet, Sileshi Gizachew; Lindberg, Diana; Afseth, Nils Kristian

2017

FTIR as a rapid tool for monitoring molecular weight distribution during enzymatic protein hydrolysis of food processing by-products

Wubshet, Sileshi Gizachew; Måge, Ingrid; Böcker, Ulrike; Lindberg, Diana; Knutsen, Svein Halvor; Rieder, Anne; Airado-Rodriguez, Diego; Afseth, Nils Kristian

2017

Smarte sensorer gir best utnyttelse av maten

Wold, Jens Petter; Afseth, Nils Kristian

2017

Surface enhanced Raman spectroscopy of phenolic antioxidants: A systematic evaluation of ferulic acid, p-coumaric acid, caffeic acid and sinapic acid

Aguilar-Hernández, Iris; Afseth, Nils Kristian; López-Luke, Tzarara; Contreras-Torres, Flavio F.; Wold, Jens Petter; Ornelas-Soto, Nancy

2017

Microtiter plate cultivation of oleaginous fungi and monitoring of lipogenesis by high-throughput FTIR spectroscopy

Kòsa, Gergely; Kohler, Achim; Tafintseva, Valeria; Zimmermann, Boris; Forfang, Kristin; Afseth, Nils Kristian; Tzimorotas, Dimitrios; Vuoristo, Kiira; Horn, Svein Jarle; Jerome, Mounier; Shapaval, Volha

2017

Proteiner med potensial

Afseth, Nils Kristian; Moren, Mari; Whitaker, Ragnhild

2016

Model-based pre-processing in Raman spectroscopy of biological samples

Liland, Kristian Hovde; Kohler, Achim; Afseth, Nils Kristian

2016

Evaluation of Hand-Held Instruments for Representative Determination of Glucose in Potatoes

Helgerud, Trygve; Knutsen, Svein Halvor; Afseth, Nils Kristian; Stene, Kim Frode; Rukke, Elling-Olav; Ballance, Simon

2016

Mixing properties and rheological characteristics of dough used to make potato-cereal soft wraps

Helgerud, Trygve; Schüller, Reidar Barfod; Dessev, Tzvetelin; Rukke, Elling-Olav; Knutsen, Svein Halvor; Afseth, Nils Kristian; Ballance, Simon

2016

Optical investigation of osteoarthritic human cartilage (ICRS grade) by confocal Raman spectroscopy: a pilot study

Kumar, Rajesh; Grønhaug, Kirsten Marie; Afseth, Nils Kristian; Isaksen, vidar; Davies, Catharina de Lange; Drogset, Jon Olav; Lilledahl, Magnus Borstad

2015

The relationship between fatty acid profiles in milk identified by Fourier transform infrared spectroscopy and onset of luteal activity in Norwegian dairy cattle

Martin, Adam Dunstan; Afseth, Nils Kristian; Kohler, Achim; Randby, Åshild Taksdal; Eknæs, Margrete; Waldmann, Andres; Dørum, Guro; Måge, Ingrid; Reksen, Olav

2015

Noninvasive analysis of thin turbid layers using microscale spatially offset Raman spectroscopy

Conti, Claudia; Realini, Marco; Colombo, Chiara; Sowoidnich, Kay; Afseth, Nils Kristian; Bertasa, Moira; Botteon, Alessandra; Matousek, Pavel

2015

Towards on-line prediction of dry matter content in whole unpeeled potatoes using near-infrared spectroscopy

Helgerud, Trygve; Wold, Jens Petter; Pedersen, Morten Bøhler; Liland, Kristian Hovde; Ballance, Simon; Knutsen, Svein Halvor; Rukke, Elling-Olav; Afseth, Nils Kristian

2015

Single Cell Confocal Raman Spectroscopy of Human Osteoarthritic Chondrocytes: A Preliminary Study

Kumar, Rajesh; Singh, Gajendra Pratap; Grønhaug, Kirsten Marie; Afseth, Nils Kristian; Davies, Catharina De Lange; Drogset, Jon Olav; Lilledahl, Magnus Borstad

2015

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

Emerging sampling approaches for Raman analysis of foods

Afseth, Nils Kristian; Bloomfield, Matthew; Wold, Jens Petter; Matousek, Pavel

2014

A novel approach for subsurface through-skin analysis of salmon using spatially offset raman spectroscopy (sors)

Afseth, Nils Kristian; Bloomfield, Matthew; Wold, Jens Petter; Matousek, Pavel

2014

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

Determining quality of caviar from Caspian Sea based on Raman spectroscopy and using artificial neural networks

Monavar, H. Mohamadi; Afseth, Nils Kristian; Lozano, J; Alimardani, R.; Omid, M.; Wold, Jens petter

2013

Multi-block regression based on combinations of orthogonalisation, PLS-regression and canonical correlation analysis

Næs, Tormod; Tomic, Oliver; Afseth, Nils Kristian; Segtnan, Vegard; Måge, Ingrid

2013

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

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

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

2013

High-throughput FTIR spectroscopy of intact HepG2 cells reveals additive and non-additive effects of individual fatty acids when given as mixtures

Najbjerg, Heidi; Young, Jette F.; Bertram, Hanne C.; Afseth, Nils Kristian; Høst, Vibeke; Kohler, Achim

2013

Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Helgerud, Trygve

2012

Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Helgerud, Trygve

2012

Near-infrared Spectroscopy for Rapid Estimation of Dry Matter Content in Whole Unpeeled Potato Tubers

Helgerud, Trygve; Segtnan, Vegard; Wold, Jens petter; Ballance, Simon; Knutsen, Svein Halvor; Rukke, Elling-Olav; Afseth, Nils Kristian

2012

Monitoring cellular responses upon fatty acid exposure by Fourier transform infrared spectroscopy and Raman spectroscopy

Najbjerg, Heidi; Afseth, Nils Kristian; Young, Jette F.; Bertram, Hanne; Pedersen, Mona Elisabeth; Grimmer, Stine J Staavi; Vogt, Kjell gjermund; Kohler, Achim

2011

Chemometrics in biospectroscopy

Kohler, Achim; Afseth, Nils Kristian; Martens, Harald

2010

Quality analysis of milk by vibrational spectroscopy

Kohler, Achim; Afseth, Nils Kristian; Jørgensen, Kjetil; Randby, Åshild Taksdal; Martens, Harald

2010

Prediction of fatty acid composition using a NIRS fibre optics probe at two different locations of ham subcutaneous fat

Perez-Juan, Maria; Afseth, Nils Kristian; Gonzalez, Joel; Diaz, Isabel; Gispert, Marina; Furnols, Maria; Oliver, M. Angels; Realini, Carolina E.

2010

Caprine CSN1S1 haplotype effect on gene expression and milk composition measured by Fourier transform infrared spectroscopy

Berget, Ingunn; Martens, Harald; Kohler, Achim; Sjurseth, Siri Kulberg; Afseth, Nils Kristian; Narum, Bjørg; Ådnøy, Tormod; Lien, Sigbjørn

2010

Predicting the Fatty Acid Composition of Milk: A Comparison of Two Fourier Transform Infrared Sampling Techniques

Afseth, Nils Kristian; Martens, Harald; Randby, Åshild T.; Gidskehaug, Lars Halvor; Narum, Bjørg; Jørgensen, Kjetil; Lien, Sigbjørn; Kohler, Achim

2010

Status på instrumentering for objektiv kvalitetsdifferensiering av lakseprodukter

Heia, Karsten; Wold, Jens Petter; Afseth, Nils Kristian

2009

Effects of concentrate or ryegrass-based diets (Lolium multiflorum) on the meat quality of lambs grazing on semi-natural pastures

Lind, Vibeke; Berg, Jan; Eik, Lars Olav; Eilertsen, Svein; Mølmann, Jørgen; Hersleth, Margrethe; Afseth, Nils Kristian; Haugland, Espen

2009

A chromatographic approach for fluorescence reduction in liquid Raman analysis

Afseth, Nils Kristian; Segtnan, Vegard; Wold, Jens-Petter; Marquardt, B.

2007

High-throughput Measurements for Functional Genomics of Milk

Martens, Harald; Kohler, Achim; Afseth, Nils Kristian; Wold, Jens-Petter; Hersleth, Margrethe; Berget, Ingunn; Ådnøy, Tormod; Skaugen, Morten; Isaksson, Tomas; Vegarud, Gerd; Criscione, Andrea; Mevik, Bjørn-Helge; Frøst, M.B.; Randby, Åshild T.; Prestløkken, Egil; Berg, Paul Ragnar; Kent, Matthew Peter; Lien, Sigbjørn; Omholt, Stig W.

2007

Raman spectra of biological samples: A study of preprocessing methods

Afseth, Nils Kristian; Segtnan, Vegard; Marquardt, BJ; Wold, Jens-Petter

2006

Raman and near-infrared spectroscopy for quantification of fat composition in a complex food model system

Afseth, Nils Kristian; Segtnan, Vegard; Marquardt, BJ; Wold, Jens-Petter

2005