title: Building global models for fat and total protein content in raw milk based on historical spectroscopic data in the visible and short-wave near infrared range.
abstract: A large set of fresh cow milk samples collected from many suppliers over a large geographical area in Russia during a year has been analyzed by optical spectroscopy in the range 400-1100 nm in accordance with previously developed scatter-based technique. The global (i.e. resistant to seasonal, genetic, regional and other variations of the milk composition) models for fat and total protein content, which were built using partial least-squares (PLS) regression, exhibit satisfactory prediction performances enabling their practical application in the dairy. The root mean-square errors of prediction (RMSEP) were 0.09 and 0.10 for fat and total protein content, respectively. The issues of raw milk analysis and multivariate modelling based on the historical spectroscopic data have been considered and approaches to the creation of global models and their transfer between the instruments have been proposed. Availability of global models should significantly facilitate the dissemination of optical spectroscopic methods for the laboratory and in-line quantitative milk analysis.
authors.affiliation: Samara State Technical University, Molodogvardeyskaya Street 244, 443100 Samara, Russia. Electronic address: melenteva-anastasija@rambler.ru.
authors.forename: Anastasiia
authors.initials: A
authors.lastname: Melenteva
authors.affiliation: Samara State Technical University, Molodogvardeyskaya Street 244, 443100 Samara, Russia.
authors.forename: Vladislav
authors.initials: V
authors.lastname: Galyanin
authors.affiliation: Samara State Technical University, Molodogvardeyskaya Street 244, 443100 Samara, Russia.
authors.forename: Elena
authors.initials: E
authors.lastname: Savenkova
authors.affiliation: Samara State Technical University, Molodogvardeyskaya Street 244, 443100 Samara, Russia; Global Modelling, Rembrandtstrasse 1, 73433 Aalen, Germany.
authors.forename: Andrey
authors.initials: A
authors.lastname: Bogomolov
mesh_terms: D000818:Animals; D002417:Cattle; D003612:Dairying; D004041:Dietary Fats / Q000032:analysis*; D005260:Female; D016018:Least-Squares Analysis; D008892:Milk / Q000737:chemistry* / Q000592:standards; D008894:Milk Proteins / Q000032:analysis*; D008962:Models, Theoretical; D012015:Reference Standards; D012426:Russia; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D004041:Dietary Fats; D008894:Milk Proteins
keywords: Global modelling; Light scatter; Milk analysis; Model transfer; Short-wave near infrared spectroscopy; Variable selection; Visible spectroscopy