Insofar as the reaction between the DPPH
and the substrate may be expected to be stoichiometric, the end-point may then be represented in terms of n DPPH, the number of DPPH molecules
reduced by one molecule of the substrate. This
form of notation also serves as a reminder that the
result may be expected to depend on the nature of
the scavenging molecule, whether this is DPPH or
another similar molecule