Antioxidant activity of anthocyanins and their aglycons.
The antioxidant activity of the six common anthocyanidins, pelargonidin, cyanidin, delphinidin, peonidin, petunidin, and malvidin, and their glycosidic forms was evaluated in three lipid-containing models [human low-density lipoprotein (LDL) and bulk and emulsified methyl linoleate]. In addition, the radical scavenging activity of the compounds against the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical was studied. Most anthocyanins and their aglycons acted as strong antioxidants in emulsion and LDL. Many compounds showed an activity comparable to the well-known antioxidants alpha-tocopherol, Trolox, catechin, and quercetin. In bulk methyl linoleate, anthocyanins and anthocyanidins possessed only a weak antioxidant activity or even oxidation-promoting activity. Depending on the anthocyanidin, different glycosylation patterns either enhanced or diminished the antioxidant power. For the most part, the activities of the glycosides and the aglycons did not differ remarkably in emulsion. In LDL the aglycons showed in general higher activities than the glycosides. In bulk oil, to the contrary, the glycosides were more effective than the aglycons.
Kähkönen
Marja P
MP
Department of Applied Chemistry and Microbiology, Division of Food Chemistry, P.O.Box 27, FIN-00014 University of Helsinki, Finland. marja.kahkonen@helsinki.fi
Heinonen
Marina
M
D000872:Anthocyanins / Q000494:pharmacology*; D000975:Antioxidants / Q000493:pharmacokinetics*; D001713:Biphenyl Compounds; D004655:Emulsions / Q000737:chemistry; D016166:Free Radical Scavengers / Q000494:pharmacology; D005960:Glucosides / Q000494:pharmacology; D006027:Glycosides / Q000494:pharmacology; D006801:Humans; D008041:Linoleic Acids / Q000737:chemistry; D015227:Lipid Peroxidation / Q000187:drug effects; D008077:Lipoproteins, LDL / Q000737:chemistry; D010636:Phenols / Q000494:pharmacology; D010851:Picrates / Q000737:chemistry
D000872:Anthocyanins; D000975:Antioxidants; D001713:Biphenyl Compounds; D004655:Emulsions; D016166:Free Radical Scavengers; D005960:Glucosides; D006027:Glycosides; D008041:Linoleic Acids; D008077:Lipoproteins, LDL; D010636:Phenols; D010851:Picrates; C065861:malvidin; C005575:methyl linoleate; C455107:petunidin-3-glucoside; C066957:pelargonidin; C017154:cyanidin; C004931:1,1-diphenyl-2-picrylhydrazyl; C017185:delphinidin