Phenolic Profile and Antioxidant Activity of Methanolic Extract of Carduus acicularis Bertol. (Asteraceae)

Iliya Zh. Slavov1, Ivanka Zh. Dimitrova-Dyulgerova2*, Rumen Mladenov2
 
1 – Medical University of Varna, Faculty of Pharmacy, Department of Pharmaceutical Technologies, 55 Marin Drinov Str., Varna 9000, BULGARIA
2 - Plovdiv University "Paisii Hilendarski", Faculty of Biology, Department of Botany and Methods of Biology Teaching, 24 Tzar Assen Str., Plovdiv 4000, BULGARIA
*Corresponding author: ivadim@uni-plovdiv.bg
 
Abstract. Phenolic acid and flavonoid profiles of Carduus acicularis were investigated for the first time. Eleven phenolic acids and eight flavonoids were identified and quantified in the inflorescences, by high performance liquid chromatography. The main phenolic compounds were found to be: sinapic acid (930.41 ± 21.72 µg/g dw), chlorogenic acid (582.66 ± 13.60 µg/g dw), rutin (545.65 ± 12.82 µg/g dw), apigenin (478.75 ± 11.38 µg/g dw), luteolin (288.46 ± 6.86 µg/g dw) and myricetin (276.32 ± 5.21 µg/g dw). The antioxidant activity of methanolic extract of inflorescences has been investigated, employing four different established testing systems: scavenging activity on 2,2-diphenil-1-picrylhydrazyl (DPPH), 2,2'-azinobis-(3-ethyl-benzothiazoline-6-sulfonate (ABTS) radical cation decolorization assay, ferric reducing antioxidant power (FRAP) and copper reduction antioxidant assays (FRAP). The highest antioxidant activity values were measured by the ABTS assay, among all performed methods.
 
Key words: Carduus acicularis, phenolic acids, flavonoids, HPLC analysis, antioxidant activity.
 

Ecologia Balkanica, 2016, vol. 8, Issue 1, pp. 41-46
Article № eb.16102, ICID: 1207894, [Full text - PDF]pdf

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