Local and chemical distribution of phlorotannins in brown algae

  title={Local and chemical distribution of phlorotannins in brown algae},
  author={Toshiyuki Shibata and Shigeo Kawaguchi and Yoichiro Hama and Masanori Inagaki and Kuniko Yamaguchi and Takashige Nakamura},
  journal={Journal of Applied Phycology},
The local and chemical distribution of phlorotannins among the Japanese Laminariaceae, Eisenia bicyclis, Ecklonia cava and Ecklonia kurome, was investigated. As a result of light microscopy observations with vanillin-HCl staining, phlorotannins were found to be accumulated within the vegetative cells of the outer cortical layer of the thalli, regardless of the species, stage of growth or organ. Crude phlorotannins comprised about 3.0% of the algal powder for each of the algae. High-performance… 

Distribution of Phlorotannins in the Brown Alga Ecklonia cava and Comparison of Pretreatments for Extraction

The brown seaweed Ecklonia cava is known to be a rich source of phlorotannins that have diverse biological activities and concentrations of dieckol and phlorofucofuroeckol-A, which were identified as major active components, were determined in different parts of the tissue.

Antioxidant activities of phlorotannins isolated from Japanese Laminariaceae

The antioxidant activities of brown algal phlorotannins were evaluated using the inhibition of phospholipid peroxidation in the liposome system, and by determining radical scavenging activities

Phlorotannin Composition of Laminaria digitata.

By combining several analytical techniques, phlorotannins in L. digitata were quantified and characterised with respect to fucol-to-phlorethol linkage ratio, molecular weight (distribution), and occurrence of structural isomers.

Analysis on the Structure of Phlorethols Isolated From the Warm-Temperate Brown Seaweed Sargassum carpophyllum and Their Antioxidant Properties

The brown seaweed Sargassum carpophyllum J. Agardh is an unused warm-temperate species in the family Sargassaceae that has been expanding its distribution along the coastal areas of Japan in recent

The Influence of Phlorotannins and Bromophenols on the Feeding Behavior of Marine Herbivorous Gastropod Turbo cornutus

Results indicate that phlorotannins and bromophenols act as chemical defense agents of brown algae against environmental stresses such as the herbivore attack.

Within-thallus variation on phlorotannin contents and physodes amount in Stypopodium zonale ( Phaeophyceae )

Phlorotannins are defensive compounds produced by brown macroalgae and stored in vesicles called physodes. However, few studies have been performed to determine the relationship between the number of

Within-thallus variation on phlorotannin contents and physodes amount in Stypopodium zonale (Phaeophyceae)

This study quantified the number of physodes and the amount of phlorotannins in apical and basal portions of Stypopodium zonale thallus to determine the relationship between the number and amount of these cellular structures and the total amount ofphlorotANNins in different regions of the thalli of seaweeds.



Inhibitory activity of brown algal phlorotannins against hyaluronidase

Acetylation of the phlorotannins markedly decreased their inhibitory potency, and 8,8'-Bieckol, the strongest HAase inhibitor in this study, acted as a competitive inhibitor with an inhibition constant (K i ) of 35 μM.

Inhibitory activity of brown algal phlorotannins against glycosidases from the viscera of the turban shell Turbo cornutus

Findings indicate that the phlorotannins deter the feeding of marine herbivorous gastropods by inhibiting the glycosidases.

Inhibitory effects of brown algal phlorotannins on secretory phospholipase A2s, lipoxygenases and cyclooxygenases

8,8′-Bieckol, the strongest LOX inhibitor in this study, inhibited soybean LOX and 5-LOX with IC50 values of 38 and 24 μM, respectively.

Feeding-Deterrent Activity of Some Laminariaceous Brown Algae against the Ezo-abalone.

It was concluded that laminariaceous algae have a chemical defense mechanism against marine herbivores, which adaptively depends on the rate of algal growth and size.

Halogenated phlorethols and fucophlorethols from the brown alga Cystophora retroflexa.


The timing and magnitude of this induced increase in phlorotannin concentration are similar to that caused by real and simulated herbivory, raising the question of whether jasmonates, or their oxylipin relatives, are natural elements of antiherbivore responses in Fucus, as they are in vascular plants.


Phlorotannins are polyphenolic brown algal secondary metabolites that can function as herbivore deterrents, digestive inhibitors, and antibacterial agents; thus, they are putative defensive agents

Chemical Defense Mechanism of the Brown Alga Eisenia bicyclisagainst Marine Herbivores.

The feeding-deterrent activities of fractions prepared from the methanol extracts were examined against the abalone Haliotis discus hannai, and active compounds were found to be phlorotannins which were previously obtained from the brown alga Ecklonia stolonifera.

The occurrence and cellular significance of physodes in brown algae

The biogenesis and the role of physodes in brown algal cells and thalli are discussed andPhlorotannins, packaged within membrane-bound physodes, appear to play multiple roles in brown algae, both at the cellular and at the organismal level.

Antioxidant activity of phlorotannins isolated from the brown alga Eisenia bicyclis

Five antioxidative substances in the brown alga Eisenia bicyclis were isolated by silicic acid column chromatography and thin-layer chromatography. They were identified to be phloroglucinol and its