ChE activity was measured in the supernatant fraction (200 L),
in 100 mM phosphate buffer, pH 8, 0.2 mM DTNB and 1.5 mM AcSCh
as substrate according to the method of Ellman et al. (1961) with
the characterization previously performed for this species (Bianco
et al., 2013). Absorbance was recorded continuously for 60 s at
412 nm. Rates were corrected for spontaneous hydrolysis of the
substrate and non-specific reduction of the chromogen by tissue
extracts. Specific activity was expressed as moles of substrate
hydrolyzed per min per mg of protein.