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Kohlrabi matrix samples with addition of sinigrin potassium salt after GC/MS analysis (a) control (H2O); (b) iron(II) sulfate (FeSO4); (c) iron(III) sulfate (Fe2(SO4)3); (d) saturated solution of calcium chloride (CaCl2); (e) silver nitrate (AgNO3); (f) copper sulfate (CuSO4); (g) anhydrous sodium sulfate salt (Na2SO4).
