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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 39 scientific publications in Cristin:

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

Nils Kristian has 59 other publications in Cristin:

Afseth, Nils Kristian; 2016: Raman analysis of foods – emerging sampling approaches and representative analysis

Afseth, Nils Kristian; Lindberg, Diana; 2016: Forskerne finner de beste proteinene i restråstoff

Afseth, Nils Kristian; Måge, Ingrid; Wold, Jens-Petter; 2016: Hurtige spektroskopiske kvalitetsmålinger av mat - Dagens muligheter og fremtidig prosesskontroll

Afseth, Nils Kristian; Wubshet, Sileshi Gizachew; Lindberg, Diana; Måge, Ingrid; Wold, Jens-Petter; Böcker, Ulrike; 2016: “Novel and rapid approaches for control and optimization of enzymatic protein hydrolysis of by-products using vibrational spectroscopy

Kattan, Danny; Palafox, Mauricio Alcolea; Afseth, Nils Kristian; Böcker, Ulrike; 2016: Simulation of the three phosphorylation steps of several nucleoside reverse transcriptase inhibitors of HIV virus by DFT quantum chemical methods, infrared and Laser Raman vibrational spectroscopy

Lindberg, Diana; Afseth, Nils Kristian; 2016: Presentation of projects at NOFIMA – Real time process control by spectroscopy and chemometrics

Martin, Adam Dunstan; Afseth, Nils Kristian; Asfeth, Nils Kristian; Kohler, Achim; Randby, Åshild T.; Waldmann, Andres; Eknæs, Margrete; Dørum, Guro; Måge, Ingrid; Reksen, Olav; 2016: The relationship between fatty acid profiles in milk identified by fourier transform infrared spectroscopy and onset of luteal activity in dairy cows

Wold, Jens-Petter; Afseth, Nils Kristian; Wubshet, Sileshi Gizachew; 2016: Optimal utilization of food raw material by use of on-line spectroscopic techniques

Afseth, Nils Kristian; 2015: From pork bellies to cell characterisation – Spectroscopic applications in food industry and research

Tafintseva, Valeria; Lien, Sigbjørn; Afseth, Nils Kristian; Knutsen, Tim; Olsen, Hanne Gro; Kohler, Achim; 2015: Bio-spectroscopy for genetic selection: improving milk fatty acid profiles in cow milk

Afseth, Nils Kristian; Wold, Jens-Petter; 2015: Introduction to calibration and multivariate regression

Afseth, Nils Kristian; Wold, Jens-Petter; 2015: NIR spectroscopy – Why? What? How?

Høst, Vibeke; Sanden, Karen Wahlstrøm; Afseth, Nils Kristian; Ofstad, Ragni; Veiseth, Eva; 2015: Choice of meat raw material and NaCl levels affects textural properties and the microstructure of model meat sausages

Afseth, Nils Kristian; 2015: Raman analysis of foods and biological samples – a lipid perspective

Afseth, Nils Kristian; Måge, Ingrid; Pilat, Z; Böcker, Ulrike; Wold, Jens-Petter; Shapaval, Volha; Bernatova, S; Tzimorotas, Dimitrios; Kòsa, Gergely; Samek, O; 2015: Towards quantitative lipid characterization in cellular matrices using Raman microspectoscopy?

Afseth, Nils Kristian; Aspevik, Tone; Lundby, Frank; Nilsen, Bjørg Narum; Oterhals, Åge; Böcker, Ulrike; 2014: A novel and rapid approach for monitoring enzymatic protein hydrolysis using Infrared spectroscopy

Afseth, Nils Kristian; 2014: Food waste: Problem or growth opportunity?

Afseth, Nils Kristian; 2014: Hurtige spektroskopiske kvalitetsmålinger av mat. Hva kan vi faktisk måle?

Afseth, Nils Kristian; Ballance, Simon; Wold, Jens-Petter; Rukke, Elling-Olav; Knutsen, Svein Halvor; Helgerud, Trygve; 2014: Towards on-line estimation of dry matter in unpeeled potato tubers using near-Infrared (NIR) interactance

Afseth, Nils Kristian; Bloomfield, Matthew; Wold, Jens-Petter; Matousek, Pavel; 2014: Emerging sampling approaches for Raman analysis of foods

Afseth, Nils Kristian; Måge, Ingrid; Böcker, Ulrike; 2014: Qualitative and quantitative characterisation of metabolic changes in cell model systems using Raman spectroscopy

Afseth, Nils Kristian; Wold, Jens-Petter; Kohler, Achim; Måge, Ingrid; Böcker, Ulrike; 2014: Raman analysis of foods and biological samples – a lipid perspective

Kumar, Rajesh; Grønhaug, K.; Afseth, Nils Kristian; Drogset, Jon Olav; Lilledahl, Magnus Borstad; 2014: Nonlinear optical microscopy and Raman spectroscopy of Osteoarthritis

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Sanden, Karen Wahlstrøm; Høst, Vibeke; Kohler, Achim; 2014: Linking FTIR-imaging, WHC and textural properties in meat products added different salts

Shapaval, Volha; Tzimorotas, Dimitrios; Afseth, Nils Kristian; Kohler, Achim; 2014: Food rest materials as a Feed Stock for production of Single Cell Oils

Shapaval, Volha; Tzimorotas, Dimitrios; Afseth, Nils Kristian; Kohler, Achim; 2014: Spectroscopy coupled with high-throughput microcultivaion for in-vitro screening in microbial bioechnology

Tafintseva, Valeria; Lien, Sigbjørn; Afseth, Nils Kristian; Knutsen, T; Kohler, Achim; 2014: Bio-spectroscopy for genetic selection: improving milk fatty acid profiles in cow milk

Afseth, Nils Kristian; Shapaval, Volha; 2014: Restråstoff - ny proteinkilde

Afseth, Nils Kristian; Barnung, Trygg Normann; Aas, Grete Hansen; Böcker, Ulrike; 2013: The potential use of Infrared and near-Infrared spectroscopy in marine oil processing

Afseth, Nils Kristian; Barnung, Trygg; Hansen Aas, Grethe; Böcker, Ulrike; 2013: The potential use of Infrared and near-Infrared spectroscopy in marine oil processing

Afseth, Nils Kristian; Bloomfield, Matthew; Wold, Jens-Petter; Andrews, Darren; Matousek, Pavel; 2013: Through-skin sub surface analysis of intact salmon using spatially offset Raman spectroscopy

Afseth, Nils Kristian; Bloomfield, Matthew; Wold, Jens-Petter; Andrews, Darren; Matousek, Pavel; 2013: Through-skin sub surface analysis of intact salmon using spatially offset Raman spectroscopy

Afseth, Nils Kristian; Larat, V; 2013: Application note: Raman characterization of fat composition

Böcker, Ulrike; Najbjerg, Heidi; Kohler, Achim; Afseth, Nils Kristian; 2013: Characterization of Metabolic Changes in Cell Model Systems Using Vibrational Spectroscopy

Böcker, Ulrike; Segtnan, Vegard; Aspevik, Tone; Vogt, Kjell Gjermund; Oterhals, Åge; Nilsen, Bjørg Narum; Afseth, Nils Kristian; 2013: A novel and rapid approach for monitoring enzymatic protein hydrolysis using Infrared spectroscopy

Helgerud, Trygve; Ballance, Simon; Knutsen, Svein Halvor; Kohler, Achim; Afseth, Nils Kristian; 2013: Characterisation of carbohydrate profiles in plant juice by mid-Infrared spectroscopy of dry films

Kirkhus, Bente; Afseth, Nils Kristian; Krona, Annika; Borge, Grethe Iren Andersen; Johansen, Silje; Steppeler, Christina; Meisland, Ane; Vogt, Kjell Gjermund; Langton, Maud; 2013: Effect of high-pressure homogenization (HPH) on release of carotenoids and fatty acids during in vitro digestion of tomato-based emulsions

Kirkhus, Bente; Afseth, Nils Kristian; Krona, Annika; Borge, Grethe Iren Andersen; Johansen, Silje; Steppeler, Christina; Meisland, Ane; Vogt, Kjell Gjermund; Langton, Maud; 2013: Effect of high-pressure homogenization (HPH) on release of lycopene and fatty acids during in vitro digestion of tomato-based emulsions

Perisic, Nebojsa; Ofstad, Ragni; Kohler, Achim; Afseth, Nils Kristian; 2013: Characterisation of salt substitution in processed beef products combining spectroscopic, sensory and chemical analysis

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Sanden, Karen W; Sanden, Karen Wahlstrøm; Nilsen, Bjørg Narum; Kohler, Achim; 2012: Following protein-water-salt interactions in meat - Integrating different spectroscopic technique

Afseth, Nils Kristian; Helgerud, Trygve; 2012: Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Helgerud, Trygve; 2012: Mer enhetlig potetkvalitet

Afseth, Nils Kristian; Perisic, Nebojsa; Ofstad, Ragni; Kohler, Achim; 2012: Salt reduction and salt replacement - Monitoring changes in protein structure and hydration in muscle-based foods using vibrational spectroscopy

Helgerud, Trygve; Segtnan, Vegard; Ballance, Simon; Knutsen, Svein Halvor; Wold, Jens-Petter; Afseth, Nils Kristian; 2011: Non-contact NIR interactance for rapid estimation of dry matter content of whole unpeeled potato tubers

Helgerud, Trygve; Segtnan, Vegard; Ballance, Simon; Knutsen, Svein Halvor; Wold, Jens-Petter; Afseth, Nils Kristian; 2011: Rapid assessment of dry matter in batches of whole unpeeled potato tubers by NIR spectroscopy

Nilsen, Bjørg Narum; Afseth, Nils Kristian; Perisic, Nebojsa; Ofstad, Ragni; Kohler, Achim; 2011: The effect of salt substitutes on protein and water structures in muscle foods – a near-infrared study

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim; 2011: Structural changes and hydration in bovine meat tissue proteins caused by salt substitutes: Integrating FTIR and Raman with NIR spectroscopy

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Hassani, Sahar; Kohler, Achim; 2010: Integrating information obtained by different spectroscopic techniques by multi-matrix techniques

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Hassani, Sahar; Kohler, Achim; 2010: Integrating information obtained by different spectroscopic techniques by multi-matrix techniques

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim; 2010: Effects of salt substitutes on protein structure in muscle foods studied by FTIR microspectroscopy

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim; 2010: Effects of salt substitutes on protein structure in muscle foods studied by FTIR microspectroscopy

Heia, Karsten; Wold, Jens-Petter; Afseth, Nils Kristian; 2009: Status på instrumentering for objektiv kvalitetsdifferensiering av lakseprodukter

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Kohler, Achim; 2009: The influence of salt substitutes on the secondary structure of food proteins - vibrational spectroscopic study

Martens, Harald; Kohler, Achim; Nilsen, Bjørg Narum; Narum, Bjørg; Randby, Åshild T.; Olsen, Hanne Gro; Jørgensen, Kjetil; Indahl, Ulf Geir; Afseth, Nils Kristian; Selmer-Olsen, Eirik; Svendsen, Morten; Lien, Sigbjørn; 2008: Bio-spectroscopy and functional genomics for optimized milk and meat quality

Perisic, Nebojsa; Afseth, Nils Kristian; Ofstad, Ragni; Martens, Harald; Böcker, Ulrike; Kohler, Achim; 2008: Study of food matrix and water interactions by spectroscopic techniques

Gidskehaug, Lars; Kohler, Achim; Olsen, Hanne Gro; Jørgensen, Kjetil; Nilsen, Bjørg Narum; Afseth, Nils Kristian; Randby, Åshild T.; Haug, Anna; Taugbøl, Ole; Lien, Sigbjørn; Martens, Harald; 2007: Biospectroscopy and partial least squares regression as a sensitive tool for optimisation of milk quality

Afseth, Nils Kristian; Segtnan, Vegard; Wold, Jens-Petter; Marquardt, B.; 2006: A chromatographic approach for fluorescence rejection in Raman analysis

Lien, Sigbjørn; Kohler, Achim; Kohler, Achim; Wold, Jens-Petter; Afseth, Nils Kristian; Martens, Harald; Aass, Laila; Jørgensen, Knut; Selmer-Olsen, Eirik; 2006: Functional genomics and biospectroscopy for optimized milk and meat quality

Afseth, Nils Kristian; Kohler, Achim; Kohler, Achim; Vegarud, Gerd Elisabeth; Berget, Ingunn; Isaksson, Tomas; Næs, Tormod; Martens, Harald; 2006: Campus Ås's Facilities for analysis of milk and other biological samples