Comparative Spectrophotometric and Chromatographic Assessment of Antioxidant Capacity in Different Marine Algae

ABSTRACT

The objective of the current study was to analyze the vital phenolic compounds available in the marine macroalgae (mostly edible) collected from the southwest coast of Turkey, to compute their total antioxidant capacity (TAC) with the cupric ion reducing antioxidant capacity (CUPRAC) and 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) assays and to correspond their antioxidant power with high performance liquid chromatography (HPLC) findings. The predominant constitutive phloroglucinol unit of the phlorotannins was the main phenolic component in brown algae species. Among the tested species, those with the greatest phloroglucinol content found by HPLC were Cladostephus spongiosum f.verticillatum (31.62 ± 0.66 μmolg⁻¹), Cystoseira barbata (13.34 ± 0.60 μmolg⁻¹), and Dictyota dichotoma (11.23 ± 0.19 μmolg⁻¹), respectively.

KEYWORDS:

• Seaweed
• antioxidant capacity
• macroalgae polyphenolics
• CUPRAC assay
• HPLC

Acknowledgments

The authors wish to thank The Scientific and Technological Research Council of Turkey (TUBITAK) for the grant from TUBITAK (Project grant number: 115Z836), and to Istanbul University-Cerrahpasa Scientific Research Fund for the grant with number FDP-2017-272. The authors would also like to thank Prof. Dr. Kevser Sözgen Başkan for all useful and helpful comments on this research.

Disclosure statement

No potential conflict of interest was reported by the authors.