Mean polyphenolic concentration (by Folin-Ciocalteu’s procedure) of six onion extracts. The concentration was expressed as mg/ml of gallic acid equivalents shown on the left side. No significant change in GAE was detected (P = 0.147). Platelet aggregation was significantly different among extracts.
Hansen et al. Nutrition Journal 2012 11:76 doi:10.1186/1475-2891-11-76