title: Differentiation of roasted and soluble coffees through physical fractionation of selected essential and nonessential metals in their brews and exploratory data analysis.
abstract: An analytical scheme for physical fractionation of Al, Ba, Ca, Co, Fe, K, Mg, Mn, Na, Ni, Sr and Zn in ground roasted and soluble coffees brews was proposed. It was based on ultrafiltration through five ultrafiltration membranes having molecular weight cut-offs of 5, 10, 30, 50 and 100kDa. The highest ">100kDa" and the lowest "<5kDa" molecular weight fractions were established to differentiate the studied coffees brews the most. Al, Cu, Fe and Ni were mostly associated with the ">100kDa" fraction, while Co, K, Mg and Na - with the "<5kDa" fraction. For Ba, Ca, Mn, Sr and Zn, ">100kDa" and "<5kDa" fractions contributions were equally accounted. The physical fractionation pattern of selected metals was convenient for discovering important features of brews of both coffee types and differences between them by principal component analysis and then classifying them by linear discriminant analysis.
authors: Wroclaw University of Technology, Faculty of Chemistry, Division of Analytic Chemistry and Chemical Metallurgy, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. Electronic address: pawel.pohl@pwr.edu.pl.
authors: Pawel
authors: P
authors: Pohl
authors: Wroclaw University of Technology, Faculty of Chemistry, Division of Analytic Chemistry and Chemical Metallurgy, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors: Anna
authors: A
authors: Szymczycha-Madeja
authors: Wroclaw University of Technology, Faculty of Chemistry, Division of Analytic Chemistry and Chemical Metallurgy, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors: Ewelina
authors: E
authors: Stelmach
authors: Wroclaw University of Technology, Faculty of Chemistry, Division of Analytic Chemistry and Chemical Metallurgy, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors: Maja
authors: M
authors: Welna
mesh_terms: D003069:Coffee / Q000737:chemistry*; D008670:Metals / Q000032:analysis*; D009753:Nutritive Value; D013054:Spectrophotometry, Atomic; D014462:Ultrafiltration
chemical_list: D003069:Coffee; D008670:Metals
keywords: Brews; Ground coffee; Metals; Physical fractionation; Soluble coffee; Ultrafiltration