Salts were selected in order to represent
varying concentrations of prooxidant metals such as; copper, iron,
manganese, calcium, and magnesium, and were based on previous
analyses of similar products. Concentrations of known metal
prooxidants, as well as Naþ and Cl ions were later quantified
(Table 1) using inductively coupled plasma-optical emission spectroscopy
(ICP-OES) (method 985.01; AOAC Int., 2007).