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. 2022 Sep 28;11(10):1932. doi: 10.3390/antiox11101932

Figure 4.

Figure 4

Effect of peroxynitrite concentration on the values of kobs for the isomerization of peroxynitrite by Dr-Nb(III) and apo-Dr-Nb in the absence and presence of CO2, at pH 7.0 and 22.0 °C. (A) Dependence of kobs on the peroxynitrite concentration in the presence of Dr-Nb(III) (open circles) and apo-Dr-Nb (filled circles), in the absence of CO2 (One-way ANOVA: open circles, ** p < 0.01, 25 × 10−6 M versus 200 × 10−6 M; filled circles, ●●● p < 0.001, 25 × 10−6 M versus 100 × 10−6 M and versus 150 × 10−6 M, ●●●● p < 0.0001, 25 × 10−6 M versus 200 × 10−6 M). (B) Dependence of kobs on the peroxynitrite concentration in the presence of Dr-Nb(III) (open squares) and apo-Dr-Nb (filled squares), in the presence of CO2 (One-way ANOVA: open squares, *** p < 0.001, 25 × 10−6 M versus 100 × 10−6 M, **** p < 0.0001, 25 × 10−6 M versus 150 × 10−6 M and versus 200 × 10−6 M; filled squares, ●●●● p < 0.0001, 25 × 10−6 M versus 50 × 10−6 M, 100 × 10−6 M, 150 × 10−6 M, and 200 × 10−6 M). The Dr-Nb(III) and apo-Dr-Nb(III) concentration was 5.0 × 10−6 M. The HCO3− concentration was 5.0 × 10−1 M.