title: Microwave plasma atomic emission spectrometric determination of Ca, K and Mg in various cheese varieties.
abstract: Microwave plasma-atomic emission spectrometry (MP-AES) was used to determine calcium, magnesium and potassium in various Turkish cheese samples. Cheese samples were dried at 100 °C for 2 days and then digested in a mixture of nitric acid/hydrogen peroxide (3:1). Good linearities (R(2) > 0.999) were obtained up to 10 μg mL(-1) of Ca, Mg and K at 445.478 nm, 285.213 nm and 766.491 nm, respectively. The analytes in a certified reference milk powder sample were determined within the uncertainty limits. Moreover, the analytes added to the cheese samples were recovered quantitatively (>90%). All determinations were performed using aqueous standards for calibration. The LOD values for Ca, Mg and K were 0.036 μg mL(-1), 0.012 μg mL(-1) and 0.190 μg mL(-1), respectively. Concentrations of Ca, K and Mg in various types of cheese samples produced in different regions of Turkey were found between 1.03-3.70, 0.242-0.784 and 0.081-0.303 g kg(-1), respectively.
authors: Istanbul Technical University, Faculty of Arts and Sciences, Department of Chemistry, 34469 Maslak, Istanbul, Turkey.
authors: Nil
authors: N
authors: Ozbek
authors: Istanbul Technical University, Faculty of Arts and Sciences, Department of Chemistry, 34469 Maslak, Istanbul, Turkey. Electronic address: akmans@itu.edu.tr.
authors: Suleyman
authors: S
authors: Akman
mesh_terms: D000818:Animals; D002118:Calcium / Q000032:analysis*; D002138:Calibration; D002611:Cheese / Q000032:analysis*; D005504:Food Analysis / Q000295:instrumentation / Q000379:methods*; D008274:Magnesium / Q000032:analysis*; D008872:Microwaves; D008892:Milk / Q000737:chemistry; D017942:Nitric Acid; D011188:Potassium / Q000032:analysis*; D013054:Spectrophotometry, Atomic / Q000379:methods*; D014421:Turkey
chemical_list: D017942:Nitric Acid; D008274:Magnesium; D011188:Potassium; D002118:Calcium
keywords: Calcium; Cheese; Magnesium; Microwave plasma-atomic emission spectrometry; Potassium