title: Green direct determination of mineral elements in artichokes by infrared spectroscopy and X-ray fluorescence.
abstract: Near infrared (NIR) and X-ray fluorescence (XRF) spectroscopy were investigated to predict the concentration of calcium, potassium, iron, magnesium, manganese and zinc in artichoke samples. Sixty artichokes were purchased from different Spanish areas (Benicarló, Valencia and Murcia). NIR and XRF spectra, combined with partial least squares (PLS) data treatment, were used to develop chemometric models for the prediction of mineral concentration. To obtain reference data, samples were mineralised and analysed by inductively coupled plasma optical emission spectrometry (ICP-OES). Coefficients of determination obtained for the regression between predicted values and reference ones for calcium, potassium, magnesium, iron, manganese and zinc were 0.61, 0.79, 0.53, 0.77, 0.54 and 0.60 for NIR and 0.96, 0.93, 0.80, 0.79, 0.76 and 0.90 for XRF, respectively. Both assayed methodologies, offer green alternatives to classical mineral analysis, but XRF provided the best results in order to be used as a quantitative screening method.
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Jeronimo Muñoz Research Building, 50th Dr. Moliner Str. 46100 Burjassot, Valencia, Spain.
authors.forename: Alba
authors.initials: A
authors.lastname: Mir-Marqués
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Jeronimo Muñoz Research Building, 50th Dr. Moliner Str. 46100 Burjassot, Valencia, Spain.
authors.forename: Maria
authors.initials: M
authors.lastname: Martínez-García
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Jeronimo Muñoz Research Building, 50th Dr. Moliner Str. 46100 Burjassot, Valencia, Spain.
authors.forename: Salvador
authors.initials: S
authors.lastname: Garrigues
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Jeronimo Muñoz Research Building, 50th Dr. Moliner Str. 46100 Burjassot, Valencia, Spain.
authors.forename: M Luisa
authors.initials: ML
authors.lastname: Cervera
authors.affiliation: Department of Analytical Chemistry, University of Valencia, Jeronimo Muñoz Research Building, 50th Dr. Moliner Str. 46100 Burjassot, Valencia, Spain. Electronic address: miguel.delaguardia@uv.es.
authors.forename: Miguel
authors.initials: M
authors.lastname: de la Guardia
mesh_terms: D031943:Cynara scolymus / Q000737:chemistry*; D005453:Fluorescence; D007501:Iron / Q000032:analysis; D016018:Least-Squares Analysis; D008274:Magnesium / Q000032:analysis; D008345:Manganese / Q000032:analysis; D008903:Minerals; D011188:Potassium / Q000032:analysis; D013052:Spectrometry, X-Ray Emission / Q000379:methods*; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014965:X-Rays; D015032:Zinc / Q000032:analysis
chemical_list: D008903:Minerals; D008345:Manganese; D007501:Iron; D008274:Magnesium; D015032:Zinc; D011188:Potassium
keywords: Cynara Scolymus L.; Green methods; Mineral elements; Near infrared spectroscopy (NIR); Partial least squares (PLS); X-ray fluorescence (XRF)