Active phlorotannins from seven brown seaweeds commercially harvested in Brittany (France) detected by 1 H NMR and in vi
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23RD INTERNATIONAL SEAWEED SYMPOSIUM, JEJU
Active phlorotannins from seven brown seaweeds commercially harvested in Brittany (France) detected by 1H NMR and in vitro assays: temporal variation and potential valorization in cosmetic applications Leslie Gager 1 & Solène Connan 1 & Magali Molla 2 & Céline Couteau 3 & Jean-François Arbona 2 & Laurence Coiffard 3 & Stéphane Cérantola 4 & Valérie Stiger-Pouvreau 1 Received: 22 July 2019 / Revised and accepted: 15 December 2019 # Springer Nature B.V. 2020
Abstract This study was focused on the phenolic content and associated cosmetic activities of seven brown marine macroalgae: Alaria esculenta, Ascophyllum nodosum, Bifurcaria bifurcata, Fucus serratus, Halidrys siliquosa, Himanthalia elongata, and Laminaria ochroleuca, selected for their abundance in Brittany and their phlorotannin production. Phlorotannins were extracted by maceration followed by a liquid/liquid purification to obtain fractions enriched in phlorotannins. Seasonal and yearly variations in phenolic contents were investigated thanks to the Folin-Ciocalteu assay to find the best harvesting season for each species. 1H nuclear magnetic resonance (NMR) was used to validate the presence of phenolic compounds and to compare the species in terms of phenolic signals, as they produce different phlorotannin molecules. Activities required for cosmetic applications (i.e., radical scavenging, antioxidant, photoprotective, and anti-aging activities) were assessed by in vitro tests. Fucales, especially A. nodosum, F. serratus, H. elongata, and H. siliquosa, showed higher phenolic contents than Laminariales. Temporal variations were apparent for five seaweeds with the highest phenolic content, notably in autumn. The phenolic content was high regardless of the season and antioxidant and photoprotective activities were similar to those of commercial molecules, allowing year-round algal harvesting. The anti-aging activity of A. nodosum and F. serratus fractions was higher than the active tea flavonol, epigallocatechin gallate. These results are promising for the use of abundant marine macroalgae as a source of natural active ingredients for cosmetic applications. Keywords Antioxidant . Brown algae . Cosmeceutical . Monitoring . NMR analysis . Polyphenols . Seasonality
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10811-019-02022-1) contains supplementary material, which is available to authorized users. * Leslie Gager [email protected] 1
Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzane, France
2
C-WEED Aquaculture, 15 rue de l’Herminette, 35350 Saint-Méloir-des-Ondes, France
3
LPiC, MMS EA2160, Faculty of Pharmacy, Université de Nantes, Nantes Atlantique Universités, 9 rue Bias, BP53508, 44 000 Nantes, France
4
Plateforme RMN-RPE Université de Bretagne Occidentale (UBO), 6 avenue Victor Le Gorgeu, CS93837, 29238 Brest Cedex 3, France
Introduction Brittany (France) has a great richness of marine macroalgae, both in terms of species diversity and biomass.
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