Nitric acid hno3

Zinkuran SC was purchased from Arysta LifeScience Slovakia s.r.o. (Nové Zámky, Slovakia). Sodium selenate was obtained from Alfa Aesar (Karlsruhe, Germany). Nitric acid (HNO₃, for mineral analysis) and hydrogen peroxide 30% (Suprapur) were purchased from LGC Standards (Molsheim, France) and Merck/VWR (Leuven, Belgium), respectively. Methanol was purchased from Biosolve (Valkenswaard, the Netherlands). Acetone was obtained from Merck (Darmstadt, Germany). Vanillin and (+)-catechin were purchased from Sigma-Aldrich (St. Louis, MO, USA). Hydrochloric acid (HCl) was obtained from VWR (Leuven, Belgium).

Zinkuran SC was purchased from Arysta LifeScience Slovakia s.r.o. (Nové Zámky, Slovakia). Sodium selenate was obtained from Alfa Aesar (Karlsruhe, Germany). Nitric acid (HNO₃, for trace element analysis) and hydrogen peroxide 30% (Suprapur) were acquired from LGC Standards (Molsheim, France) and Merck/VWR (Leuven, Belgium), respectively. Sodium selenite (Na₂SeO₃), Sodium selenate (Na₂SeO₄), Se-methionine (SeMet), Se-cystine (SeCys₂), and Se-methyl-selenocysteine (SeMetSeCys) were purchased from Sigma Aldrich (St. Louis, MO, USA). Protease XIV, citric acid, and methanol were from Sigma Aldrich. MilliQ (MQ) water from Water Systems Ltd. (Brussels, Belgium) was used throughout the experiment.

Zinkuran SC was acquired from Arysta LifeScience Slovakia s.r.o. (Nové Zámky, Slovakia). Sodium selenate was purchased from Alfa Aesar (Karlsruhe, Germany). Nitric acid (HNO₃, for trace element analysis) was obtained from LGC Standards (Molsheim, France), and hydrogen peroxide (H₂O₂) 30% (Suprapur) was obtained from Merck/VWR (Leuven, Belgium). Methanol was purchased from Biosolve (Valkenswaard, the Netherlands). Acetone, sodium carbonate (Na₂CO₃), and sodium hydroxide (NaOH) were acquired from Merck (Darmstadt, Germany). Ascorbic acid (vitamin C), (+)-catechin, gallic acid, Folin–Ciocalteu's phenol reagent, 2,4,6-tri(2-pyridyl)-s-triazine (TPTZ), 2,2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) diammonium salt, 2–2′-azobis (2-methylpropionamidine) dichloride (AAPH), aluminum chloride (AlCl₃), and iron(II) sulfate were obtained from Sigma–Aldrich (St. Louis, MO, USA). Hydrogen chloride (HCl) and sodium nitrite (NaNO₂) were obtained from VWR (Leuven, Belgium). Iron(III) chloride 6-hydrate was purchased from Merck (Darmstadt, Germany).