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Collection,identification and Biochemical Analyses of Different Sea Weeds from Saint Martin’s Island

K.M. FORMUZUL HAQUE
Director-in-charge
IFST, BCSIR, Dhaka

SHAMIMA YESMIN CHY
Research Fellow
BCSIR Laboratories, Chittagong

SHAHINA AKTER3
Scientific Officer
BCSIR Laboratories, Dhaka,

MD. ABDUL WAHAB
Principle Scientific Officer
BCSIR Laboratories, Chittagong, Bangladesh.

K.K. NATH
Principle Scientific Officer
BCSIR Laboratories, Chittagong, Bangladesh.

Abstract/ Executive Summary:

Five species of marine algae were collected from Saint Martin’s island, identified and biochemical analyses were carried out in BCSIR Laboratories, Chittagong. Biochemical composition were analysed to evaluate its food value and also to find out variation in composition during the period of investigation. The protein content of Sargassum coriifolium was 16.07%, whereas in Padina ltenuis that was estimated at 8.32%. The percentage of fat in Sargassuni coriitolium along with the other sea weeds was 0.5%. It was found that major of the biochemical parameters of these sea weeds were higher except the protein contents than that of Spirulina. The carbohydrate content in Dictyota dichotoma (38.94%) was lower among these sea weeds, but more than that of Spirulina. Carbohydrate contents were higher (56.29%) in Hypnea musciformis. Mineral contents as well as other parameters, especially carbohydrate contents were higher in these algae than that of Spirulina.

Keywords: Collection, Identification, Biochemical analyses, Sea weeds.

Location: Saint Martin’s island, BCSIR Laboratory, Chittagong

Start Date:

End Date:

Program Area: Resource Development and Management

Commodity: Seaweed

Objectives:

Considering the importance of sea weeds, it can be said that, sea weeds can play a vital role in various aspects compared to other aquatic resources of Bangladesh. Much attention should he given on sea weed to compensate the food problem to some extent and fulfill the deficiency of nutrition for erecting the economy of Bangladesh.

Methodology:

Collections of sea weeds: Thirteen species of eight genera sea weeds have been collected from St. Martin’s Island. They belong to genera Hypnea (white and red), Sargussum Pudinu, Liagora, Dictyota, Caulerpa, Merismopedia, Hydroclathru. The sea weeds were collected from exposed rock surfaces of the St. Martin’s Island during the lowest low tide. Some drifted species were also collected from sea shore. For better accuracy, a sharp knife was used in collection of the species. The specimens were temporarily stored in plastic bags before sorting and preservation; collected specimens were washed with clean sea water to remove debris and other foreign materials.Identification and preservation of sea weeds: Islam (1976), Chapman (1973), Islam and Aziz (1987), Sterrer (1986) were consulted for the identification of the collected specimens. Coloured photographs were taken of the specimens. The collected specimens were preserved by 4% formalin solution (Trono, 1988) in plastic containers for laboratory test at BCSIR Laboratory, Chittagong. Herbarium specimen were prepared from the preserved specimen and were kept in the Laboratory. Besides, a suitable amount of fresh samples were sun-dried after thorough washing in sea water and at the same time samples were used for extraction of phycocolloid. Analysis: Biochemical analyses of Hypnea (white and red form), Sargassum, Pudina diclyota were carried out in the BCSIR Laboratories, Chittagong. The analyses include percentage of protein, moisture, ash, fats, carbohydrates, and minerals (calcium, magnesium, sodium, potassium, iron) of the sea weeds. Fresh sun-dried samples have been taken for biochemical analysis. Protein was determined by Kjeldahl method, fat was extracted with low boiling petroleum ether, by sox-let extraction and the extract thus obtained was weighed after careful recovery of the solvent. Moisture content was determined by complete drying of the sample at 100 ± 5° C i.e., by complete removal of free water present in the sample. The loss in weight of the sample is the measure of moisture content. The ash content of the sample is the inorganic residue left after complete removal of the organic residue by muffling at about 550-650°C in the muffle furnace. Most of the chemical constants were determined according to the standard procedure of AOCS (AOAC, 1990). Carbohydrate was quantified by following standard method (Winton and Winton, 1947). For the determination of Calcium, Magnasium, Sodium, Potassium, and Iron, the ash samples were first digested in I M HC1 and the concentration curves of the standard elements adapting titrimetric, spectrophotometric and flame photometric methods (Jefferx. 1979).

Source of Information: Bangladesh J. Agril. Res. 34(1): 59-65, March 2009, ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Though protein contents of these sea weeds were less, but carbohydrate and mineral contents were higher. These sea weeds may solve the problems of carbohydrate and mineral deficiency in human nutrition by consuming these sea weeds in near future. Sea weeds as well as red and brown algae have the ability to accumulate iodine and thus they may be regarded as a good source of concentrated iodine.

Knowledge Management: Journal