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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 has 45 scientific publications in Cristin:

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

Aguilar-Hernández, Iris; Afseth, Nils Kristian; López-Luke, Tzarara; Contreras-Torres, Flavio F.; Wold, Jens Petter; Ornelas-Soto, Nancy; 2017: Surface enhanced Raman spectroscopy of phenolic antioxidants: A systematic evaluation of ferulic acid, p-coumaric acid, caffeic acid and sinapic acid

Aspevik, Tone; Oterhals, Åge; Rønning, Sissel Beate; Altintzoglou, Themistoklis; Wubshet, Sileshi Gizachhew; Gildberg, Asbjørn; Afseth, Nils Kristian; Whitaker, Ragnhild D.; Lindberg, Diana; 2017: Valorization of proteins from co- and by-products from the fish and meat industry

Böcker, Ulrike; Wubshet, Sileshi Gizachhew; Lindberg, Diana; Afseth, Nils Kristian; 2017: Fourier-transform infrared spectroscopy for characterization of protein chain reductions in enzymatic reactions

Wubshet, Sileshi Gizachhew; Måge, Ingrid; Böcker, Ulrike; Lindberg, Diana; Knutsen, Svein Halvor; Rieder, Anne; Airado-Rodriguez, Diego; Afseth, Nils Kristian; 2017: FTIR as a rapid tool for monitoring molecular weight distribution during enzymatic protein hydrolysis of food processing by-products

Vang, Birthe; Altintzoglou, Themistoklis; Måge, Ingrid; Wubshet, Sileshi Gizachhew; Afseth, Nils Kristian; Whitaker, Ragnhild D.; 2017: Peptide recovery and commercialization by enzymatic hydrolysis of marine biomass

Helgerud, Trygve; Schüller, Reidar Barfod; Dessev, Tzvetelin; Rukke, Elling-Olav; Knutsen, Svein Halvor; Afseth, Nils Kristian; Ballance, Simon; 2016: Mixing properties and rheological characteristics of dough used to make potato-cereal soft wraps

Helgerud, Trygve; Knutsen, Svein Halvor; Afseth, Nils Kristian; Stene, Kim Frode; Stene, Kim Frode; Rukke, Elling-Olav; Ballance, Simon; 2016: Evaluation of Hand-Held Instruments for Representative Determination of Glucose in Potatoes

Liland, Kristian Hovde; Kohler, Achim; Afseth, Nils Kristian; 2016: Model-based pre-processing in Raman spectroscopy of biological samples

Kumar, Rajesh; Singh, Gajendra Pratap; Grønhaug, Kirsten Marie; Afseth, Nils Kristian; Davies, Catharina De Lange; Drogset, Jon Olav; Lilledahl, Magnus Borstad; 2015: Single Cell Confocal Raman Spectroscopy of Human Osteoarthritic Chondrocytes: A Preliminary Study

Helgerud, Trygve; Wold, Jens Petter; Pedersen, Morten Bøhler; Pedersen, Morten Bøhler; Liland, Kristian Hovde; Ballance, Simon; Knutsen, Svein Halvor; Rukke, Elling-Olav; Afseth, Nils Kristian; 2015: Towards on-line prediction of dry matter content in whole unpeeled potatoes using near-infrared spectroscopy

Conti, Claudia; Realini, Marco; Colombo, Chiara; Sowoidnich, Kay; Afseth, Nils Kristian; Bertasa, Moira; Botteon, Alessandra; Matousek, Pavel; 2015: Noninvasive analysis of thin turbid layers using microscale spatially offset Raman spectroscopy

Martin, Adam Dunstan; Afseth, Nils Kristian; Kohler, Achim; Randby, Åshild T.; Eknæs, Margrete; Waldmann, Andres; Dørum, Guro; Måge, Ingrid; Reksen, Olav; 2015: The relationship between fatty acid profiles in milk identified by Fourier transform infrared spectroscopy and onset of luteal activity in Norwegian dairy cattle

Kumar, Rajesh; Grønhaug, Kirsten Marie; Afseth, Nils Kristian; Isaksen, vidar; Davies, Catharina De Lange; Davies, Catharina De Lange; Drogset, Jon Olav; Lilledahl, Magnus Borstad; 2015: Optical investigation of osteoarthritic human cartilage (ICRS grade) by confocal Raman spectroscopy: a pilot study

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)

Shapaval, Volha; Afseth, Nils Kristian; Vogt, Kjell Gjermund; Kohler, Achim; 2014: Fourier transform infrared spectroscopy for the prediction of fatty acid profiles in Mucor fungi grown in media with different carbon sources

Urban, Jan; Afseth, Nils Kristian; Štys, Dalibor; 2014: Fundamental definitions and confusions in mass spectrometry about mass assignment, centroiding and resolution

Monavar, H. Mohamadi; Afseth, Nils Kristian; Lozano, J; Alimardani, R.; Omid, M.; Wold, Jens Petter; 2013: Determining quality of caviar from Caspian Sea based on Raman spectroscopy and using artificial neural networks

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

Næs, Tormod; Tomic, Oliver; Afseth, Nils Kristian; Segtnan, Vegard; Måge, Ingrid; 2013: Multi-block regression based on combinations of orthogonalisation, PLS-regression and canonical correlation analysis

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

Afseth, Nils Kristian; Kohler, Achim; 2012: Extended multiplicative signal correction in vibrational spectroscopy, a tutorial

Helgerud, Trygve; Segtnan, Vegard; Wold, Jens Petter; Ballance, Simon; Knutsen, Svein Halvor; Rukke, Elling-Olav; Afseth, Nils Kristian; 2012: Near-infrared Spectroscopy for Rapid Estimation of Dry Matter Content in Whole Unpeeled Potato Tubers

Najbjerg, Heidi; Afseth, Nils Kristian; Young, Jette F.; Bertram, Hanne; Pedersen, Mona Elisabeth; Grimmer, Stine J Staavi; Vogt, Kjell Gjermund; Kohler, Achim; 2011: Monitoring cellular responses upon fatty acid exposure by Fourier transform infrared spectroscopy and Raman spectroscopy

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

Afseth, Nils Kristian; Böcker, Ulrike; 2010: Raman and Infrared Imaging of Foods

Afseth, Nils Kristian; Martens, Harald; Randby, Åshild T.; Gidskehaug, Lars Halvor; Nilsen, Bjørg Narum; Jørgensen, Kjetil; Lien, Sigbjørn; Kohler, Achim; 2010: Predicting the Fatty Acid Composition of Milk: A Comparison of Two Fourier Transform Infrared Sampling Techniques

Berget, Ingunn; Martens, Harald; Kohler, Achim; Sjurseth, Siri Kulberg; Afseth, Nils Kristian; Nilsen, Bjørg Narum; Ådnøy, Tormod; Lien, Sigbjørn; 2010: Caprine CSN1S1 haplotype effect on gene expression and milk composition measured by Fourier transform infrared spectroscopy

Kohler, Achim; Afseth, Nils Kristian; Martens, Harald; 2010: Chemometrics in biospectroscopy

Perez-Juan, Maria; Afseth, Nils Kristian; Gonzalez, Joel; Diaz, Isabel; Gispert, Marina; Furnols, Maria; Oliver, M. Angels; Realini, Carolina E.; 2010: Prediction of fatty acid composition using a NIRS fibre optics probe at two different locations of ham subcutaneous fat

Kohler, Achim; Afseth, Nils Kristian; Jørgensen, Kjetil; Randby, Åshild T.; Martens, Harald; 2010: Quality analysis of milk by vibrational spectroscopy

Lind, Vibeke; Berg, Jan; Eik, Lars Olav; Eilertsen, Svein; Mølmann, Jørgen; Hersleth, Margrethe; Afseth, Nils Kristian; Haugland, Espen; 2009: Effects of concentrate or ryegrass-based diets (Lolium multiflorum) on the meat quality of lambs grazing on semi-natural pastures

Mørkved, Eva Henmo; Pedersen, Frank Marton; Afseth, Nils Kristian; Kjøsen, Helge; 2008: Cyclotetramerisations of sulfanyl substituted pyrazine-2,3-dicarbonitriles and phthalonitriles

Afseth, Nils Kristian; Segtnan, Vegard; Segtnan, Vegard; Wold, Jens Petter; Marquardt, B.; 2007: A chromatographic approach for fluorescence reduction in liquid Raman analysis

Martens, Harald; Kohler, Achim; Afseth, Nils Kristian; Wold, Jens Petter; Hersleth, Margrethe; Berget, Ingunn; Ådnøy, Tormod; Skaugen, Morten; Isaksson, Tomas; Vegarud, Gerd Elisabeth; 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: High-throughput Measurements for Functional Genomics of Milk

Mørkved, Eva Henmo; Afseth, Nils Kristian; Zimcik, Petr; 2007: Azaphtalocyanines with extended conjugation through heteroaryl and aryl substituents. Photochemical and photophysical properties

Westad, Frank; Afseth, Nils Kristian; Bro, Rasmus; 2007: Finding relevant spectral regions between spectroscopic techniques by use of cross model validation and partial least squares regression

Afseth, Nils Kristian; 2007: Vibrational spectroscopy and chemometrics for rapid and reliable characterisation of food - A few aspects concerning Raman spectroscopy

Mørkved, Eva Henmo; Afseth, Nils Kristian; Zimcik, Petr; 2007: Azaphthalocyanines with extended conjugation through heteroaryl and aryl substituents. Photochemical and photophysical properties

Afseth, Nils Kristian; Segtnan, Vegard; Marquardt, BJ; Wold, Jens Petter; 2006: Raman spectra of biological samples: A study of preprocessing methods

Afseth, Nils Kristian; Wold, Jens Petter; Segtnan, Vegard; 2006: The potential of Raman spectroscopy for characterisation of the fatty acid unsaturation of salmon

Mørkved, Eva Henmo; Afseth, Nils Kristian; Kjøsen, Helge; 2006: Zn(quinoline)2Cl2: an efficient reagent for synthesis of zinc azaphthalocyanines with thimorpholine- or pyrazole substituents

Afseth, Nils Kristian; Segtnan, Vegard; Marquardt, BJ; Wold, Jens Petter; 2005: Raman and near-infrared spectroscopy for quantification of fat composition in a complex food model system