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

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 mu molg(-1)), Cystoseira barbata (13.34 +/- 0.60 mu molg(-1)), and Dictyota dichotoma (11.23 +/- 0.19 mu molg(-1)), respectively.

Automated summary

The objective of this study was to analyze the phenolic compounds in marine macroalgae, mainly edible ones, collected from the southwest coast of Turkey. The total antioxidant capacity (TAC) was computed using the CUPRAC and ABTS assays, and correlated with the HPLC findings. The phloroglucinol unit of the phlorotannins was found to be the main phenolic component in brown algae species, with Cladostephus spongiosum f.verticillatum, Cystoseira barbata, and Dictyota dichotoma having the highest content.