After published the protocol https://bio-protocol.org/e1913, we realized that the Cp in the original formulas of MDA, SOD, POD, CAT and GST is incorrect, should be replaced with (Cp × V).
MDA (nmol/mg protein) = (A532-A600) × Vr × (V/Vt)/155 × 1,000/(Cp × V) SOD total activity (unit: u/mg protein) = [(Ack-As) × V]/(0.5 × Ack × Vt)/ (Cp × V) POD activity (unit: u/mg protein) = △A470 × (V/Vt)/(0.01 × t)/ (Cp × V) CAT activity (unit: u/mg protein) = △A240 × (V/Vt)/(0.1 × t)/ (Cp × V) GST activity (unit: u/mg protein) = (△A340s - △A340ck) × (V/Vt)/t/(Cp × V)