The stoichiometric effect of the extracts on ROS production by PMN was measured by lucigenin-enhanced CL. Lucigenin is considered as a good chemiluminescence probe for measuring extracellular superoxide anions because it does not enter the cells (Caldefie-Chézet et al., 2002). This technique is used to measure the ability of the substances in the extracts to neutralise superoxide anionderived radical species produced during neutrophil stimulation.