Abstract
The antioxidant activity during storage at 30°C of quercetin, myricetin and a-tocopherol in small unilamellar
liposomes has been investigated. Myricetin was more effective than a-tocopherol as an antioxidant in liposomes under
all conditions studied. At pH 5.4 with a concentration of 102 mol:mol phospholipid, myricetin has been shown to
be the strongest antioxidant followed by quercetin and a-tocopherol. Cupric chloride and ferric chloride strongly
reduced the antioxidant activity of myricetin and quercetin with cupric chloride causing a stronger reduction in
activity than ferric chloride. At a pH of 7.4, quercetin was less effective than a-tocopherol at a concentration of 102
mol:mol phospholipid, but it’s activity increased more strongly with concentration and it was very effective at a
concentration of 5102 mol:mol phospholipid. © 1998 Published by Elsevier Science Ireland Ltd. All rights
reserved.