title: Cider fermentation process monitoring by Vis-NIR sensor system and chemometrics.
abstract: Optimization of a multivariate calibration process has been undertaken for a Visible-Near Infrared (400-1100nm) sensor system, applied in the monitoring of the fermentation process of the cider produced in the Basque Country (Spain). The main parameters that were monitored included alcoholic proof, l-lactic acid content, glucose+fructose and acetic acid content. The multivariate calibration was carried out using a combination of different variable selection techniques and the most suitable pre-processing strategies were selected based on the spectra characteristics obtained by the sensor system. The variable selection techniques studied in this work include Martens Uncertainty test, interval Partial Least Square Regression (iPLS) and Genetic Algorithm (GA). This procedure arises from the need to improve the calibration models prediction ability for cider monitoring.
authors.affiliation: Surface Chemistry Unit, IK4-Tekniker, Iñaki Goenaga 5, 20600 Eibar, Spain. Electronic address: alberto.villar@tekniker.es.
authors.forename: Alberto
authors.initials: A
authors.lastname: Villar
authors.affiliation: Surface Chemistry Unit, IK4-Tekniker, Iñaki Goenaga 5, 20600 Eibar, Spain.
authors.forename: Julen
authors.initials: J
authors.lastname: Vadillo
authors.affiliation: SGIKER-UPV, University of the Basque Country, Tolosa Hiribidea 7, 20018 Donosti, Spain.
authors.forename: Jose I
authors.initials: JI
authors.lastname: Santos
authors.affiliation: Atten2 Advanced Monitoring Technologies, Iñaki Goenaga 5, 20600 Eibar, Spain.
authors.forename: Eneko
authors.initials: E
authors.lastname: Gorritxategi
authors.affiliation: Electronics and Comms. Unit, IK4-Tekniker, Iñaki Goenaga 5, 20600 Eibar, Spain.
authors.forename: Jon
authors.initials: J
authors.lastname: Mabe
authors.affiliation: Intelligent Information Systems Unit, IK4-Tekniker, Iñaki Goenaga 5, 20600 Eibar, Spain.
authors.forename: Aitor
authors.initials: A
authors.lastname: Arnaiz
authors.affiliation: Department of Analytical Chemistry, University of the Basque Country, 48080 Bilbao, Spain.
authors.forename: Luis A
authors.initials: LA
authors.lastname: Fernández
mesh_terms: D000434:Alcoholic Beverages; D005285:Fermentation / Q000502:physiology*; D019344:Lactic Acid; D008962:Models, Theoretical; D013030:Spain; D019265:Spectroscopy, Near-Infrared / Q000379:methods*
chemical_list: D019344:Lactic Acid
keywords: Chemometrics; Cider; Fermentation; Sensor system; Visible-Near Infrared