Journal of Aquaculture & Fisheries Category: Aquaculture Type: Research Article
Determination of the Seasonal Yields of Total Fucose and Fucoidan Yields in Brown Seaweeds (Order Fucales) Distributed along the Coast of Urla (izmir, Turkey)
- Gamze Turan1*, Semra Cirik2, Hatice Tekogul2, Edis Koru2, Ulviye Karacalar2, Safak Seyhaneyildiz2
- 1 Department Of Aquaculture, Ege University, Bornova, Izmir, Turkey
- 2 Department Of Aquaculture, Ege University, Bornova, ?zmir, Turkey
*Corresponding Author:Gamze Turan
Department Of Aquaculture, Ege University, Bornova, Izmir, Turkey
Received Date: Aug 02, 2017 Accepted Date: Oct 26, 2017 Published Date: Nov 09, 2017
The brown seaweeds have been recognized as a potential source of biologically active Fucoidan, a mucilaginous sulfated polysaccharide consisting mainly of a polymer of α-L-fucose-4-sulfate but with persistent amounts of other sugars, mainly Xylose and Galactose and have been reported to have Anti-Cancer, Anti-Obesity and Anti-Inflammatory effects.
This study was carried out to determine the seasonal yields of total Fucose and Fucoidan from brown seaweed species (Order Fucales) of Cystoseira barbata, C. compressa and Sargassum vulgare distributed naturally along the coast of Urla (Izmir, Turkey) using a colorimetric method.
Mean fucoidan yields were 6.44±1.44% (dry weight basis) for Cystoseira barbata, 3.84±1.14% for Sargassum vulgare and 3.04±1.77% for C. compressa (n=3). The highest Fucoidan yields in these species were determined in the fall season (P≤0.05).
Brown Seaweed-derived polysaccharides such as Fucoidan, Laminaran, Alginates and Mannitol have been studied due to their biological effectiveness as Anticoagulant, Antitumor, Antithrombotic, Anti-inflammatory, Contraceptive and Antiviral agent [7-10].
Fucoidans, is a term that covers a family of Fucose-Containing Sulfated Polysaccharides (FCSPs), may constitute up to 25-30% of the seaweed dry weight, depending on the seaweed species and, to a lesser extent, on life history stage and season [11,12].
Fucoidans participate in the building of cell walls and the support of their structure, as well as in releasing of spores and gametes from reproductive organs. Due to the sulfated groups, these polysaccharides can bind positively charged ions, such as K+, Na+, Ca2+, Mg2+ and participate in ion exchange with the environment, which facilitates adaptation of seaweeds to water salinity fluctuations and to the toxic effects of heavy metals. Fucoidans play a substantial role in morphogenesis of zygotes of Fucoid algae, as they participate in establishing the cell polarity and fixing the cell-division axis, thus determining the direction for the development of the rhizoidal and apical poles of young thalli .
Documented biological functionalities of these compounds are the activities against Hepatitis, Herpes and Human Acquired Immune Deficiency (AIDS) Viruses, the Anticoagulant, Anti-inflammatory Heparin and molecules that modify cell proliferation and adhesion and fertilization functions [13-20].
Despite all the above-mentioned benefits, research on the Fucoidan content of Seaweeds in Turkey is limited.
The aim of the current study was to determine the sulfated polysaccharides (Fucoidan) yields of seaweeds of Cystoseira barbata, C. compressa and Sargassum vulgare (Order Fucales) that are distributed on the Turkish coast. An experimental design was implemented to evaluate the Fucoidan content and effect of the seasonal variation on the Fucoidan yield among the species with specific goal to determine the best time of the year to obtain Fucoidan from natural populations of these species.
MATERIALS AND METHODS
Figure 1: The map of study area.
Colorimetric determination of fucose
The absorbance at 396 and 427 nm was read in this solution. The total Fucose, F, in milligrams was calculated from the following formula:
F= B × 0.06 × V
B is the difference between the two absorbancy readings (396 and 427 nm)
0.06 is a factor converting absorbance to amount of Fucose in miligrams per mililiter and
V is the total volume of the extract in mililiters
To obtain the approximate amount of Fucoidan of the sample, the Fucose content was multiplied by a factor of 2 .
RESULTS AND DISCUSSION
The fucoidan yields of seaweed species recorded here are similar to that the values in Chotigeat et al. , Larsen  and Usov et al. . Chotigeat et al.  reported a fucoidan content of 2.74±1.18% in dw in Sargassum polycystum, which compared favorably with Pelvetica canaliculata. Larsen (1978) reported a Fucoidan content of 6-8% in dw in Ascophyllum nodusum, 9-11% in Fucus species, 5-20% in Laminaria sp., and 20% in dw in Pelvetia canaliculate. Usov et al. (2001) reported the fucoidan content of between 0.4 and 20.4% in dw in 25 different brown seaweed species and 7.7% in Fucus evanescens (Order Fucales).
Mean Fucoidan yield in Cystoseira barbata was highest in spring and fall and lowest in winter (Table 2). Similarly, mean fucoidan yield in C. compressa was highest in spring and fall and lowest in winter (Table 2). In Sargassum vulgare, Mean Fucoidan yield was highest in fall and summer and lowest in winter (Table 2).
Chotigeat et al.  have also reported a seasonal variation in Fucoidan content in the seaweeds they examined, with the highest yields of Fucoidan found in fall.
Addition to species and the season, the extraction method also is an important factor that has great effect on the Fucoidan yields of the sea weeds showed by Wang and Cheng . In the study of Wang and Cheng it was found that the fucoidan content extracted using method I was 13.13% (of dry weight), 24.00% and 22.67% from Sargassum glaucescens, Sargassum horneri and Laminaria japonica, respectively. By contrast, the fucoidan content extracted using method II was 4.20%, 4.80% and 4.64% from S. glaucescens, S. horneri and L. japonica, respectively. The sample sex-tracted using method II were lower in total sugar content but higher in sulfated content than those extracted using method I. Using method II yielded the highest fucose content in S. Glaucescens (20.89%) and Hizikia fusiformis (15.89%).
Addition to the species and seasonal conditions, the extraction method has also a significant effect on the yields of Fucoidan. Considering of sulfate content of Fucoidans, it is supposed that the functional activity of fucoidans between the three species will be similar because sulfate is well-known factor of Fucoidan’s biological function. So, each species should be considered a good source for Fucoidan that has the activities against Hepatitis, Herpes and Human Immunodeficiency (AIDS) Viruses, Anticoagulant heparin inflammation, Cell proliferation and adhesion.
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Citation:Turan G, Cirik S, Tekogul H, Koru E, Karacalar U, et al. (2017) Determination of the Seasonal Yields of Total Fucose and Fucoidan Yields in Brown Seaweeds (Order Fucales) Distributed along the Coast of Urla (izmir, Turkey). J Aquac Fisheries 1: 005.
Copyright: © 2017 Gamze Turan, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.