Assessment of the content of phenolics and antioxidant action of inflorescences and leaves of selected species from the genus Sorbus sensu stricto.
In order to find new sources of natural antioxidants, the antioxidant potential of 70% methanolic extracts from the inflorescences and leaves of 16 species from the genus Sorbus s.s. was evaluated using two complementary in vitro test systems: the DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging assay and the AAPH [2,2¢-azobis-(2-amidinopropane)dihydrochloride]-induced linoleic acid (LA) peroxidation test. The radical-scavenging capacities of the extracts towards the DPPH radical were in the range of 0.25-0.86 millimolar Trolox® equivalents/g dry weight. They were significantly correlated (r=-0.8089, p<0.001) with the results of the LA-peroxidation test, indicating the Sorbus extracts to be universal antioxidants. Significant linear correlations were also found between the different antioxidant potentials and total phenolic contents as estimated by the Folin-Ciocalteu method and further verified by serial determinations of proanthocyanidins, chlorogenic acid isomers and flavonoids (çrêin the range of 0.71-0.95, p<0.001). Cluster analysis of the data matrix identified the ten samples (inflorescences of S. aucuparia, S. pohuashanensis, S. decora, S. koehneana, S. commixta, S. gracilis, and S. sitchensis, and the leaves of S. wilfordii, S. pogonopetala, and S. gracilis) exhibiting the highest antioxidant activity and total phenolic levels and therefore the greatest potential as effective sources for natural health products.
Department of Pharmacognosy, Faculty of Pharmacy, Medical University of Lodz, 1 Muszynski St., 90 151 Lodz, Poland. monika.olszewska@umed.lodz.pl
Monika A
MA
Olszewska
Sławomira
S
Nowak
Piotr
P
Michel
Piotr
P
Banaszczak
Agnieszka
A
Kicel
D000578:Amidines / Q000737:chemistry; D000975:Antioxidants / Q000032:analysis / Q000737:chemistry*; D019787:Linoleic Acid / Q000737:chemistry; D010084:Oxidation-Reduction; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D031994:Sorbus / Q000737:chemistry*; D013045:Species Specificity
D000578:Amidines; D000975:Antioxidants; D010936:Plant Extracts; C046728:2,2'-azobis(2-amidinopropane); D019787:Linoleic Acid