title: The content of Ca, Cu, Fe, Mg and Mn and antioxidant activity of green coffee brews.
abstract: A simple and fast method of the analysis of green coffee infusions was developed to measure total concentrations of Ca, Cu, Fe, Mg and Mn by high resolution-continuum source flame atomic absorption spectrometry. The precision of the method was within 1-8%, while the accuracy was within -1% to 2%. The method was used to the analysis of infusions of twelve green coffees of different geographical origin. It was found that Ca and Mg were leached the easiest, i.e., on average 75% and 70%, respectively. As compared to the mug coffee preparation, the rate of the extraction of elements was increased when infusions were prepared using dripper or Turkish coffee preparation methods. Additionally, it was established that the antioxidant activity of green coffee infusions prepared using the mug coffee preparation was high, 75% on average, and positively correlated with the total content of phenolic compounds and the concentration of Ca in the brew.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Stanislawa Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Ewelina
authors.initials: E
authors.lastname: Stelmach
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Stanislawa Wyspianskiego 27, 50-370 Wroclaw, Poland. Electronic address: pawel.pohl@pwr.wroc.pl.
authors.forename: Pawel
authors.initials: P
authors.lastname: Pohl
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Wroclaw University of Technology, Wybrzeze Stanislawa Wyspianskiego 27, 50-370 Wroclaw, Poland.
authors.forename: Anna
authors.initials: A
authors.lastname: Szymczycha-Madeja
mesh_terms: D000975:Antioxidants; D002118:Calcium; D003069:Coffee / Q000737:chemistry*; D003300:Copper; D062385:Hydroxybenzoates / Q000737:chemistry*; D007501:Iron; D008274:Magnesium; D008345:Manganese; D010084:Oxidation-Reduction; D013054:Spectrophotometry, Atomic / Q000379:methods*
chemical_list: D000975:Antioxidants; D003069:Coffee; D062385:Hydroxybenzoates; D008345:Manganese; D003300:Copper; D007501:Iron; D008274:Magnesium; C017616:phenolic acid; D002118:Calcium
keywords: Antioxidant activity; Coffee infusion; Green coffee; High resolution-continuum source flame atomic absorption spectrometry; Macro- and microelements; Total phenolic compounds