Table 3. Monophasic models, kinetic parameters and statistical indices in the prediction of radical scavenging activity of pumpkin seed oil.

Model/parameter	Oil sample
	CP1	CP2	RS1	RS2	RS3	RS4	RS5	S1	S2
Zero-order model
k0	–0.029	–0.030	–0.018	–0.025	–0.025	–0.020	–0.019	–0.027	–0.031
R2	0.9792	0.9563	0.9593	0.9816	0.9642	0.9723	0.9654	0.9138	0.9443
SRMSE	0.144	0.221	0.200	0.134	0.190	0.164	0.185	0.311	0.251
χ2 error	11.96	18.57	16.62	11.15	15.78	13.62	15.47	25.79	20.94
First-order model
k1	0.062	0.081	0.044	0.050	0.058	0.043	0.043	0.097	0.090
R2	0.9912	0.9832	0.9663	0.9892	0.9773	0.9792	0.9724	0.9564	0.9764
SRMSE	0.094	0.137	0.182	0.103	0.151	0.142	0.165	0.221	0.163
χ2 error	7.79	11.51	15.13	8.54	12.57	11.81	13.81	18.34	13.62
Logarithmic model
k1	0.188	0.224	0.833	0.236	0.344	0.412	0.504	0.369	0.255
R2	0.9996	0.9997	0.9923	0.9995	0.9986	0.9994	0.9986	0.9996	0.9983
SRMSE	0.019	0.019	0.084	0.022	0.036	0.024	0.036	0.021	0.043
χ2 error	1.60	1.65	7.17	1.90	3.09	2.04	3.07	1.79	3.66

k₀ and k₁=rate constants, R²=determination coefficient, SRMSE=scaled root mean square error, χ² error=error of chi-square test. For oil sample abbreviations see Table 1