Seasonal variation of polyphenolics inAscophyllum nodosum(Phaeophyceae)

Abstract

Thalli of the brown alga Ascophyllum nodosum were collected on the Scottish west coast and the phlorotannin content was measured once a month between January and December 2005. Due to the potential use of A. nodosum extract as a nutritional supplement or for medical purposes, our aim was to determine the most favourable time for collection of the algal material. For this purpose two different methods for quantitative phenol determination were used, i.e. the well-known spectrophotometric measurements with Folin-Ciocalteu's phenol reagent (FC-method) and for the first time quantitative

Seasonal variations in the phenolic compound content and antioxidant activities of three selected species of seaweeds from Tiskerth islet, Bejaia, Algeria

“…Similar observations have been reported previously, with maxima observed from late summer to the middle winter [33]. However, other studies have described maximum levels in summer [5,19,20,34] depending on the species.On the other hand, Phaeophyta results reported to contain comparatively higher contents and more active antioxidants than green and red algae [35,36]. However, in our study, the rhodophyte S. coronopifolius showed highest total phenolic content comparing with the brown algae H. scoparia andZ.…”

Seasonal Variation of Phenolic Antioxidant-mediated α-glucosidase Inhibition of Ascophyllum nodosum

“…Marine plants produce phenolic phytochemicals as a by-product of internal resource balances [20][21][22][23] in response to nutrient stress [21][22][23][24][25] or as a result of severe defoliation [26]. The seasonal variation in the phenolic content in A. nodosum and other brown seaweeds has been reported in the past [27][28][29] and should be monitored to help standardize the finished products. The metabolic production of polyphenolics depends on the harvesting location and season [28].…”

“…The metabolic production of polyphenolics depends on the harvesting location and season [28]. A. nodosum harvested in Norway had a maximum polyphenolic content in the winter season [28], while those harvested from the Scottish west coast showed a maximum phenolic content in July [29]. To date there is no published report regarding the seasonal variation of A. nodosum harvested from the US Northeast coast.…”

Extract powder from the brown alga Ascophyllum nodosum (Linnaeus) Le Jolis (AMPEP): a “vaccine-like” effect on Kappaphycus alvarezii (Doty) Doty ex P.C. Silva

“…One of the most commonly used and studied seaweeds for agricultural applications is Ascophyllum nodosum (Linnaeus) Le Jolis (Parys et al 2009;Craigie 2011;Jayaraman et al 2011).…”