Browsing NOFIMA vitenarkiv by Author "Eskildsen, Carl Emil Aae"
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Cage of covariance in calibration modeling: Regressing multiple and strongly correlated response variables onto a low rank subspace of explanatory variables
Eskildsen, Carl Emil Aae; Næs, Tormod; Skou, P.B.; Solberg, Lars Erik; Dankel, Elin Katinka; Basmoen, Silje A.; Wold, Jens Petter; Horn, Siri S.; Hillestad, B.; Poulsen, Nina A.; Christensen, Mette; Pieper, Theo; Afseth, Nils Kristian; Engelsen, Søren B. (Peer reviewed; Journal article, 2021)In analytical chemistry, multivariate calibration is applied when substituting a time-consuming reference measurement (based on e.g. chromatography) with a high-throughput measurement (based on e.g. vibrational spectroscopy). ... -
Diagnosing indirect relationships in multivariate calibration models
Eskildsen, Carl Emil Aae; Engelsen, Søren B.; Dankel, Elin Katinka; Solberg, Lars Erik; Næs, Tormod (Peer reviewed; Journal article, 2021)Problems concerning covariance among independent variables are well understood and dealt with by inverse regression methods like partial least squares regression. However, covariance between dependent variables has only ... -
Estimating dry matter and fat content in Blocks of Swiss cheese during production using on-line near infrared spectroscopy
Eskildsen, Carl Emil Aae; Sanden, Karen Wahlstrøm; Wubshet, Sileshi Gizachhew; Andersen, Petter Vejle; Øyaas, Jorun; Wold, Jens Petter (Peer reviewed; Journal article, 2019) -
In-line and non-destructive monitoring of core temperature in sausages during industrial heat treatment by NIR interaction spectroscopy
Wold, Jens Petter; O'Farrell, Marion; Tschudi, Jon; Eskildsen, Carl Emil Aae; Andersen, Petter Vejle; Ottestad, Silje (Peer reviewed; Journal article, 2020) -
Non on-destructive fluorescence spectroscopy combined with second-order calibration as a new strategy for the analysis of the illegal Sudan I dye in paprika powder
Monago-Maraña, Olga; Eskildsen, Carl Emil Aae; Muñoz de la Peña, Arsenio; Galeano-Díaz, Teresa; Wold, Jens Petter (Peer reviewed; Journal article, 2020)This paper presents a novel strategy for determination of the illegal dye Sudan I in paprika powder. The method is based on fluorescence spectroscopy combined with second-order calibration, which was employed for the first ... -
Non-destructive Raman spectroscopy as a tool for measuring ASTA color values and Sudan I content in paprika powder
Monago-Marana, Olga; Eskildsen, Carl Emil Aae; Afseth, Nils Kristian; Galeano-Diaz, Teresa; Munoz de la Pena, Arsenio; Wold, Jens Petter (Journal article; Peer reviewed, 2019) -
Sample-Specific Prediction Error Measures in Spectroscopy
Eskildsen, Carl Emil Aae; Næs, Tormod (Peer reviewed; Journal article, 2020)In applied spectroscopy, the purpose of multivariate calibration is almost exclusively to relate analyte concentrations and spectroscopic measurements. The multivariate calibration model provides estimates of analyte ... -
Unbiased prediction errors for partial least squares regression models: Choosing a representative error estimator for process monitoring
Skou, Peter B; Tonolini, Margherita; Eskildsen, Carl Emil Aae; Berg, Frans van den; Rasmussen, Morten Arendt (Peer reviewed; Journal article, 2023)Partial least squares (PLS) regression is widely used to predict chemical analytes from spectroscopic data, thus reducing the need for expensive and time-consuming wet chemical reference analysis in industrial process ... -
Untargeted classification for paprika powder authentication using visible – Near infrared spectroscopy (VIS-NIRS).
Monago-Maraña, Olga; Eskildsen, Carl Emil Aae; Galeano-Diaz, Teresa; Munoz de la Pena, Arsenio; Wold, Jens Petter (Peer reviewed; Journal article, 2020)This paper presents a novel strategy for determination of the illegal dye Sudan I in paprika powder. The method is based on fluorescence spectroscopy combined with second-order calibration, which was employed for the first ... -
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 (Chapter, 2019)In recent years, vibrational spectroscopy has been used to predict detailed sample composition like protein and fatty acid profiles. This study shows that fatty acid predictions from near infrared measurements in food ...