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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 69 publications at Nofima:

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

Academic article

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

Academic article

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

Academic article

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

Academic chapter/article/Conference paper

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

Academic article

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

Academic chapter/article/Conference paper

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

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Academic article

FT-IR spectra of the anti-HIV nucleoside analogue d4T (Stavudine). Solid state simulation by DFT methods and scaling by different procedures

Palafox, Mauricio Alcolea; Kattan, Danny; Afseth, Nils Kristian

2018

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Report

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

Academic chapter/article/Conference paper

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

Academic literature review

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

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

2017

Academic article

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

Academic article

Smarte sensorer gir best utnyttelse av maten vår

Wold, Jens Petter; Afseth, Nils Kristian

2017

Popular scientific article

Smarte sensorer gir best utnyttelse av maten

Wold, Jens Petter; Afseth, Nils Kristian

2017

Popular scientific article

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

Academic article

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

Academic article

Proteiner med potensial

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

2016

Popular scientific article

Forskerne finner de beste proteinene i restråstoff

Afseth, Nils Kristian; Lindberg, Diana

2016

Popular scientific article

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

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

2016

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Academic article

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

Academic article

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

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

Restråstoff - ny proteinkilde

Afseth, Nils Kristian; Shapaval, Volha

2014

Article in business/trade/industry journal

Fundamental definitions and confusions in mass spectrometry about mass assignment, centroiding and resolution

Urban, Jan; Afseth, Nils Kristian; Štys, Dalibor

2014

Academic article

Fourier transform infrared spectroscopy for the prediction of fatty acid profiles in Mucor fungi grown in media with different carbon sources

Shapaval, Volha; Afseth, Nils Kristian; Vogt, Kjell Gjermund; Kohler, Achim

2014

Academic article

Emerging sampling approaches for Raman analysis of foods

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

2014

Article in business/trade/industry journal

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

Academic article

Application note: Raman characterization of fat composition

Afseth, Nils Kristian; Larat, V

2013

Popular scientific article

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

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

Academic article

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

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

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

Academic article

Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Helgerud, Trygve

2012

Popular scientific article

Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Helgerud, Trygve

2012

Popular scientific article

Extended multiplicative signal correction in vibrational spectroscopy, a tutorial

Afseth, Nils Kristian; Kohler, Achim

2012

Academic article

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

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

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

Academic article

Chemometrics in biospectroscopy

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

2010

Academic chapter/article/Conference paper

Quality analysis of milk by vibrational spectroscopy

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

2010

Academic chapter/article/Conference paper

Raman and Infrared Imaging of Foods

Afseth, Nils Kristian; Böcker, Ulrike

2010

Academic chapter/article/Conference paper

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

Academic article

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

Academic article

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

Academic article

Status på instrumentering for objektiv kvalitetsdifferensiering av lakseprodukter

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

2009

Nofima reports

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

Academic article

Finding relevant spectral regions between spectroscopic techniques by use of cross model validation and partial least squares regression

Westad, Frank; Afseth, Nils Kristian; Bro, Rasmus

2007

Academic article

Azaphtalocyanines with extended conjugation through heteroaryl and aryl substituents. Photochemical and photophysical properties

Mørkved, Eva Henmo; Afseth, Nils Kristian; Zimcik, Petr

2007

Academic article

A chromatographic approach for fluorescence reduction in liquid Raman analysis

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

2007

Academic article

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

Academic article

Raman spectra of biological samples: A study of preprocessing methods

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

2006

Academic article

The potential of Raman spectroscopy for characterisation of the fatty acid unsaturation of salmon

Afseth, Nils Kristian; Wold, Jens Petter; Segtnan, Vegard

2006

Academic article

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

Academic article