Total phenolic contents, radical scavenging and cyclic voltammetry of seaweeds from Brittany

Abstract

International audienceThe role of polyphenols as antioxidants in our daily nutrition has been extensively investigated, but information on composition of tannins from marine sources on nutrient utilisation is limited. This study will be focused on the determination of the polyphenol quantities in brown seaweeds from Brittany coast in France; the extracts were delivered from algae centre for valorisation (CEVA), and the fidelity of the method was examined intraday and interlaboratories. The seaweed's extracts are divided into three categories: Fucus Vesiculosus, Ascophyllum nodosum and Fucus Serratus. Consequently, the total polyphenol contents (TPC) of these extracts will be measured using Folin-Glombitza spectrophotometric method. Thereafter, the antioxidant properties of these polyphenols were determined using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging. All polyphenols extracted were tested using cyclic voltammetry (CV) in aprotic media. The CV is realised to compare the results from spectroscopic method and to electrochemically characterise the seaweed's polyphenols

Anticancer and Antioxidant Activities of Some Algae from Western Libyan Coast

“…As a result of the presence of a high level of polyphenols including phenolic acids, flavonoids, isoflavones, cinnamic acid, benzoic acid, quercetin in algae, these algal extracts are reliable sources antioxidants [12]. …”

“…Also seaweeds are considered as a source of bioactive compounds as they are able to produce a great variety of secondary metabolites, characterized by a wide range of biological activities such as antimicrobial [2][3][4], anti-inflammatory [5], anti-viral; as well as anti-tumoral activities [7,8]. Moreover, many studies show that some algal extracts display substantial antioxidant activities [9][10][11][12].…”

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“…Especially fucoidans from marine algae have been reported to exhibit outstanding biological activities that aid human health 93 fucoidans were extracted from different seaweeds such as Ascophyllum nodosum, Sargassum stenophyllum, Laminaria japonica and were reportd to have pharmaceutical potentials 94 . There are several carrageenans, differing in their basic chemical structure and properties, and therefore in their uses.…”

Recent advances in the identification and the study of composition and activities of medicinal plants

“…That is why Keyrouz et al [138] thought to manage a new competent system, which can offer systematically results and can economise expensive raw materials.…”