Season, locality and parts of the thallus influence fucoidan yield and its compositions among the three Gulf of Mannar brown seaweeds

摘要

In this study, fucoidan yield and its proximate composition(total carbohydrate, fucose and sulphate) extracted from Sargassum wightii,Dictyota dichotoma and Stoechospermum marginatum during different seasons and at various localities (Pamban-PalkBay, Rameswaram, Pamban-Gulfof Mannarand Pudumadam, Gulf of Mannar) were recorded. In Sargassum wightii, the composition invarious parts was also reported. The yield and its compositions were found to be maximum in the monsoon and the minimum in summer and optimum in the premonsoon and postmonsoon seasons in the three brown seaweeds collected at Pamban-Gulf of Mannar. Significant difference in the fucoidan yield and its compositions were observed due to the influence of environment and seawater quality of respective locality. Significant variations in the fucoidan yield were recorded among the blade, air bladder and stem of Sargassum wightii. But the variations in the fucoidan compositions such as total carbohydrate, fucose and sulphate recorded among the blade, air bladder and stem of Sargassum wightii were not significant. This suggested that fucoidan composition in various parts of the brown seaweed Sargassum wightiiwas similar. However, insignificantly higherfucoidan content was found in leaf than air bladder and stem. It is due to the soluble form of fucoidan accumulated in the cytoplasm of leaf blade.