Four (red,
violet, white and green) varieties of Allium cepa L. studied for their
FRSA showed wide range in terms of IC50 (inhibitory concentration) from 0.1 to 15.2 mg/ml, EC50 (efficient concentration) from
4.3 to 660.8 mg/mg and ARP (antiradical power) from 0.15 to
23.2. (Prakash, Singh et al., 2007). The different values for the
AOA and FRSA in several reports are largely dependent on biodiversity, genetic, geographical variations, the method of extraction/
analysis and the ways to express the results (Kim et al., 2006).