Characteristics of Polyphenolic Content in Brown Algae of the Pacific Coast of Russia.

Natalia M. Aminina,Evgeny V. Yakush,Ekaterina P. Karaulova,Kwang-Tae Son,Yeon-Kye Kim,Tatiana I. Vishnevskaya,Ki-Ho Nam

doi:10.3390/molecules25173909

Natalia M. Aminina, Evgeny V. Yakush + Show 5 more

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https://doi.org/10.3390/molecules25173909

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Abstract

Water and ethanol brown macroalgal extracts of nine species of Laminariales and four species of Fucales of the Pacific coast of Russia were investigated. It has been shown that brown algae species of Agarum, Thalassiophyllum, Fucus and Cystoseira can be a source of the polyphenolic compounds with antioxidant activity. Phenolic content in the ethanol algal extracts (Undaria pinnatifida, Arthrothamnus bifidus, Thalassiophyllum clathrus and Agarum turneri) was 1.1–3.5 times higher than in the water extracts. In Sargassum pallidum and Kjellmaniella crassifolia, the total polyphenolic content was 2.1 and 1.6 times higher, respectively, in water extracts than in ethanol extracts. The maximum radical scavenging activity has been detected in Agarum turneri ethanol extracts (38.8 mg ascorbic acid/g and 2506.8 µmol Trolox equiv/g dry algae). Phlorotannin content varies from 16.8 μg/g dry sample of Costaria costata to 2763.2 μg/g dry sample of Agarum turneri. It is found the content of polyphenolic compounds in brown algae is determined mainly by their species-specificity and by their belonging to the genus. The presence of major phenols in the extract of Thalassiophyllum clathrus, such as phenolic acid (gallic acid), hydroxycinnamic acids (caffeic acid, chlorogenic acid, coumaric acid) and flavonols (kaempferol, quercetin) has been established.

Highlights

Algae metabolites are known to have cytostatic, antiviral, anthelmintic, antifungal and antibacterial activity [1,2]
> dichloromethane fr. > hexane fr. > water fr., with EC50 values of 22.0 ± 0.1, 26.5 ± 0.8, 39.5 ± 0.4, 46.3 ± 0.5, and > 500 μg/mL, respectively. These results indicate that the ethyl acetate fraction of the ethanol extract possessed the strongest scavenging activity toward DPPH radicals
Our research has shown that brown algae are a potential source of natural antioxidants that can be used for preventive treatment and to benefit human nutrition

Summary

Introduction

Algae metabolites are known to have cytostatic, antiviral, anthelmintic, antifungal and antibacterial activity [1,2]. Antioxidant effect is associated with polyphenols and the phlorotannins, the oligomers or polymers of phloroglucinol [3,4]. They are considered to be found only in brown seaweed [5,6]. Antioxidant activity of phlorotannins, extracted from the different brown algae species, was demonstrated in vitro [7,8]. Some polyphenolic compounds exhibiting antioxidant effect, such as catechins, flavonols and flavonol glycosides, have been identified in methanol extracts of red and brown algae [9,10,11]. The brown algae phlorotannins demonstrate an anti-inflammatory effect [17,18]

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