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Polyphenols of Rosa L. Leaves Extracts and their Radical Scavenging Activity

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Polyphenols of Rosa L. Leaves Extracts and their Radical Scavenging Activity

Renata Nowak

a,

* and Urszula Gawlik-Dziki

b

a Chair and Department of Pharmaceutical Botany, Medical University of Lublin, Chodz´ki 1 Str., 20-093 Lublin, Poland. E-mail: renata.nowak@am.lublin.pl

b Department of Biochemistryand Food Chemistry, Agriculture Academyof Lublin, Akademicka Str. 15, 20-034 Lublin, Poland

* Author for correspondence and reprint requests

Z. Naturforsch.62 c, 32Ð38 (2007); received Mai 16/June 27, 2006

Antioxidant potential ofRosaL. leaves methanolic extracts was evaluatedin vitrousing a spectrophotometric method based on measuring the radical scavenging effect on 2,2-di- phenyl-1-picrylhydrazyl (DPPH) radicals. The contents of ellagic acid, quercetin and kaemp- ferol in the extracts from leaves of seventeen rose species were determined using SPE-RP- HPLC methods. Additionally, total phenolic content was determined spectrophotometrically according to the Folin-Ciocalteu procedure and calculated as gallic acid equivalents (GAE).

Remarkable high antioxidant activityand high total phenolic content (5.7%⬍GAE⬍ 15.2%), large ellagic acid (EA) content from 9.37 to 19.42 mg/g of dryweight, a quercetin content ranging from 3.68 to 15.81 mg/g of dryweight and kaempferol content from 1.25 to 9.41 mg/g of dryweight were found in rose leaves. Significant correlation between EA (r2= 0.6131), quercetin (r2= 0.5158), total phenolic content (r2= 0.8485) and antioxidant activity was observed.

Basing on the studies conducted one mayassume that the extracts of rose leaves are a rich source of natural antioxidants and could be used to prevent free-radical-induced deleteri- ous effects.

Key words: RosaL., Phenolic Compounds, Antioxidant Activity

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