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Investigation on Mineral Composition of Freshwater Crab (paratelphusa Lamellifrons) of Padma River Near Rajshahi City, Bangladesh

Md. Badrul Islam
Senior Scientific Officer
Drugs & Toxins Research Division, BCSIR Laboratories, Rajshahi, Bangladesh

Md. Bokul Mia
M.Sc Student
Zoology Department of Zoology University of Rajshahi, Bangladesh

Md. Abdur Razzaque
M.Sc Student
Zoology Department of Zoology University of Rajshahi, Bangladesh

Md. Moniruzzaman Sarker
Professor
Department of Zoology University of Rajshahi, Bangladesh

Md. Redwanur Rahman
Associate Professor
Institute of Environmental Science University of Rajshahi, Bangladesh

Md. Abdul Jalil
Principal Scientific Officer
Drugs & Toxins Research Division, BCSIR Laboratories, Rajshahi, Bangladesh

Md. Abdur Rahim
Scientific Officer
Drugs & Toxins Research Division, BCSIR Laboratories, Rajshahi, Bangladesh

Dalim Kumar Roy
Scientific Officer
Applied Zoology Research Division, BCSIR Laboratories, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The present study deals with the investigation of mineral composition of the freshwater crab Paratelphusa lamellifrons from the river Padma near Rajshahi city of Bangladesh. Amount of mineral in the different body parts were found to be in the range between (6.63-7729.15) mg/kg. Mineral components like K, Ca, Fe, Cu and P among the different body parts of the freshwater crab were recorded in the ranges of (1037.03-1192.79) mg/kg, (5385.87-5640.81) mg/kg, (423.22-487.03) mg/kg, (6.63-64.78) mg/kg and (6539.21-7729.15) mg/kg respectively. From the present study it is evident that the different body parts contents higher amount of P, Ca and K than Fe and Cu. Among the different body parts of crab presence of minerals in cephalothorax were found to higher compared to cheliped and legs.

Keywords: Paratelphusa lamellifrons, Freshwater crab, Mineral composition, Padma River, Different body parts

Location: Padma River near Rajshahi City, Bangladesh

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Nutrition, Crab

Objectives:

Although the presence of essential mineral in any food item is the reflection of the quality of that food, no work has been done on the mineral contents of different body parts of freshwater crabs of the river Padma. So, the aim of the present study was to determine the mineral (potassium, calcium, iron, and copper and phosphorus) contents of crab of the river Padma.

Methodology:

Mineral contents of crab sample were determined by atomic absorption spectrometry according to the methods of AOAC.

2.1 Wet digestion of sample For wet digestion of sample, exactly (0.5 g) of the representative powdered sample were taken in Kjeldhal digestion tube. Six milliliters (6 ml) of HNO3 was added to the samples and mixture was kept for overnight at room temperature. Then 4.0 ml perchloric acid (HClO4) was added to this mixture and was heated in a block digester gradual in creased of temperature starting from 50ºC and increasing up to (200-250)⁰C. Appearance of white fumes indicate the completion of digestion in about 70-85min. The mixture was left to cool down, filtered and the contents of the tubes were transferred to 100 ml volumetric flasks and made up to the mark with distilled water. The wet digested solution was transferred to plastic bottles, stored and used for mineral estimation by Atomic Absorption Spectrophotometer (Hitachi model 170-10) in the Central Science Lab, University of Rajshahi. The amount of minerals was calculated from standard graph of each mineral.

2.2 Estimation of phosphorous Determination of Phosphorus of crab powder samples were done by following the method Vanadomolybdate yellow colour method. The acid digested solution was used for phosphorus content of samples. 10 ml aliquot of digested crab extract was pipetted out into 50 ml volumetric flask. Then 10ml vanadomolybdate reagent was added, dilute to 50 ml with DW, mix well and the intensity of the yellow colour was read at 470 nm on GENESYS 20 spectrophotometer. The amount of phosphorus was calculated from standard graph of phosphorous.

Source of Information: International Journal of Fisheries and Aquatic Studies 2016; 4(6): 236-240

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results obtained in this study showed that crab species P. lamellifrons are nutritious and rich in essential elements such as Fe, K, Ca, Cu and P. Nutrients are required in order to build and repair cells and body tissues, maintain the organs and bones in optimum working condition and to provide energy, fuel and warmth. Ca and P are necessary to maintain optimal bone development with more of both minerals being required during childhood and growing stages to prevent rickets and osteomalacia. Iron has several vital functions in the body. Adequate Iron in the diet is very important for decreasing the incidence of anaemia. Good nutrition is essential for good health and eating nutritious food can help prevent common ailments, as well as more life-threatening illnesses and diseases. The present study revealed that all the body parts of the investigated crab are very much rich with essential mineral components which could be used as an excellent source of vital nutrients for human consumption and could also be used in the formulation of well-balanced animal feed.

Knowledge Management: Journal