Abstract
ABSTRACT The aim of this study was to assess the phenolic composition extracted from the brown alga Cystoseira sauvageauana collected from the Algerian coast through high-performance liquid chromatography-electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS) analysis and their antioxidant activity based on free radical scavenging and reducing power. The crude extract was obtained from dried biomass using ethanol/water and then fractionated (liquid-liquid) using solvents of increasing polarity. The ethyl acetate fraction contained the largest amount of phenolic compounds (59.27 ± 0.20 g of phloroglucinol equivalents per 100 g of fraction dry weight) and showed strong radical scavenging and reducing capacity. HPLC-ESI-MS/MS analysis using the multiple reactions monitoring scan mode showed that this fraction was mostly composed of phlorotannins (41 compounds) with a degree of polymerization ranging from 3 to 12. The most abundant compounds were two phloroglucinol nonamer isomers (deprotonated molecular ion [M-H]− at m/z 1117). The results suggest that Cystoseira sauvageauana represents an important natural source of antioxidants that could be valorized for human health.
Published Version
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