Original scientific paper

https://doi.org/10.15255/KUI.2023.021

Chemical Composition and Antioxidant Activity of Fraxinus ornus L. and Fraxinus excelsior L.

Amira Čopra-Janićijević ; University of Sarajevo, Faculty of Science, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina *
Dušan Čulum ; University of Sarajevo, Faculty of Science, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina
Danijela Vidic ; University of Sarajevo, Faculty of Science, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina
Anela Topčagić ; University of Sarajevo, Faculty of Science, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina
Lejla Klepo ; University of Sarajevo, Faculty of Science, Zmaja od Bosne 33-35, 71 000 Sarajevo, Bosnia and Herzegovina

* Corresponding author.

Abstract

In this work, the total content of phenolics, flavonoids, and phenolic acids in the leaves and bark extracts of Fraxinus ornus L. and Fraxinus excelsior L. was determined. In addition, the identification and quantification of phenolic acids was performed using the HPLC-DAD technique. Samples were tested for antioxidant activity using the ABTS and DPPH methods. Eight extract samples were prepared by Soxhlet and ultrasound extraction using 70 % ethanol as solvent. The content of phenolic compounds ranged from 7.59 for F. ornus to 88.93 mg GAE/g for F. excelsior in the bark extracts obtained by Soxhlet extraction. The highest content of total flavonoids in F. ornus and F. excelsior was found in the leaves extracts obtained by ultrasound extraction, which was 5.68 and 1.74 mg GAE/g extract, respectively. The results also showed that the highest content of total phenolic acids was found in F. ornus (105.33 mg CAE/g) and F. excelsior (97.97 mg CAE/g) in the bark extract obtained by Soxhlet extraction. The highest content of gallic acid (112.96 ± 1.32 mg g–1 extracts) and chlorogenic acid (246.94 ± 0.82 mg g–1 extracts) was found in the F. ornus bark extract obtained by ultrasound extraction. As for antioxidant activity, the bark extract obtained by Soxhlet extraction of F. ornus showed the best antioxidant activity by ABTS method with IC₅₀ value of 0.062 mg ml–1. The results of the DPPH method show that the leaves extract obtained by Soxhlet extraction had the best antioxidant activity for the F. ornus sample, with an IC₅₀ value of 0.23 mg ml–1.

Keywords

Fraxinus ornus; Fraxinus excelsior; phenolic compounds; flavonoids; phenolic acids; ABTS; DPPH

Hrčak ID:

313288

URI

https://hrcak.srce.hr/313288

Publication date:

18.1.2024.

Article data in other languages: croatian

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