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. 2021 Apr 25;13(5):617. doi: 10.3390/pharmaceutics13050617

Table 4.

First-order rate constants for vitamin D3 at various temperatures in Milli-Q (MQ), distilled (DW), and tap water (TW), along with the Arrhenius equation.

DW TW MQ
k1 (4 °C) (h−1] (CI) 0.027 (0.023–0.031) 0.012 (0.009–0.014) 0.001 (0.000–0.002)
k1 (25 °C) (h−1) (CI) 0.143 (0.124–0.162) 0.099 (0.096–0.102) 0.024 (0.021–0.026)
k1 (40 °C) (h−1) (CI) 0.400 (0.385–0.416) 0.339 (0.270–0.407) 0.085 (0.077–0.092)
Arrhenius equation y = −6465x + 19.74 y = −8142x + 24.96 y = −10,725x + 31.97
R 2 1.000 0.999 0.988
Ea (kJ/mol) 53.8 67.7 89.2

CI—95% confidence interval; Ea—activation energy.