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Studies on the Proximate Composition, Quality and Heavy Metal Concentration of Sundried Bombay Duck and Sun-dried Ribbon Fish of Cox’s Bazar District of Bangladesh

M. G. M. Jamil
Department of Fisheries Technology, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202

M. N. Hossain
Department of Fisheries, Ministry of Fisheries and Livestock, Government of the People's Republic of Bangladesh

M. M. Mia
Department of Fisheries, Ministry of Fisheries and Livestock, Government of the People's Republic of Bangladesh

M. A. Mansur*
Department of Fisheries Technology, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202

S. Uga
Department of Nursing, Faculty of Nurse, Kobe Women?s University, 4-7-2 Minatojima-nakamachi, Chuo-ku, Kobe 650-0046, Japan.

Abstract/ Executive Summary:

Proximate composition, quality aspect and heavy metal concentration of sun-dried Bombay Duck (Harpodon nehereus) and sun-dried Ribbon fish (Trichiurus haumela) were studied in a series of laboratory experiments. Sun-dried fishes were collected from a fish market of Cox's Bazar town. These sun-dried marine fishes were collected from the stock after first drying procedure. Organoleptically most of these sun-dried fishes were in „B- grade that means in „Good- condition (SDP 2.33 and 2.35 respectively). Crude Protein, Lipid, Moisture, Ash, TVB-N and TMA-N content (%) of sun-dried Bombay Duck (Harpodon nehereus) was 32.21±1.05 %, 3.51±0.38 %, 37.26±0.70 %, 16.22±0.56 %, 115.45±1.73 mg/100g, 9.37±0.13 mg/100g respectively. Whereas in sundried Ribbon fish (Trichiurus haumela) the content (%) of Crude Protein, Lipid, Moisture, Ash, TVB-N and TMA-N was 31.64±1.28 %, 5.06±0.10 %, 35.78±0.97 %, 12.33±0.27 %, 107.69±1.37 mg/100g and 9.91±0.23 mg/100g respectively. Heavy metal concentration i.e. Cd, Cr, Pb, Cu and Zn concentration (ppm) in sun-dried Bombay Duck (Harpodon nehereus) was 0.82, 8.38, 8.28, 2.21, 55.38 ppm. Whereas heavy metal concentration (ppm) in sun-dried Ribbon fish (Trichiurus haumela) was Cd 0.48 ppm, Cr 6.96 ppm, Pb 5.46 ppm, Cu 1.40 ppm, Zn 19.95 ppm.

Keywords: Proximate composition, Sun-dried bombay duck, Sun-dried ribbon fish, Sensory quality, TMA-N

Location: Cox’s Bazar District of Bangladesh

Start Date:

End Date:

Program Area: Quality and Nutrition

Commodity: Dried fish, Duck, Heavy metal

Objectives:

Such data and information will be helpful to develop effective quality control and Assurance Programme as well as to produce a safe product for export as well as for domestic consumption.

Methodology:

Source of Sun-dried fish Sun dried Bombay duck and sun dried Ribbon fish were collected from Cox's Bazaar District about a year before the beginning of analysis. After collection the samples were transported to the laboratory of Fisheries Technology Department, Bangladesh Agricultural University, Mymensingh. Finally carefully packed in several jars and kept in store room at room temperature. Stored samples were used for consequent laboratory analysis. Sensory Quality assessment Sensory quality as for example colour, odour, taste and texture, infestation, broken pieces of sun dried Bombay duck (Harpadon nehereus) and sun dried Ribbon fish (Trichiurus haumela) was conducted by organoleptic method of Howgate et al. (1992). In doing so the SDP (Score of Defect Points) was calculated first. Bio-chemical analysis Proximate composition (Protein, Lipid, Ash, Moisture), TVB-N and TMA-N of the sun-dried fish samples were conducted according to the method of A.O.A.C (1965) and AMC (1979). All determinations were done in triplicate and the average value has been reported mentioning the standard deviation. In doing so, slight modification/change in the use of apparatus was followed during this research. Heavy metal analysis Sample preparation for heavy metal analysis The sun-dried fish were chopped and finely homogenized (ground) with a blender. Approximately 5g homogenized (ground) sample was taken in a crucible and dried at 1050C for 24 hours in an electric oven. This dried sample was used for heavy metal analysis. Sample digestion Accurately weighed 0.5 – 1.0 g oven dried sample was taken in a Micro-Kjeldahl flask. A volume of 10 ml nitric acid was added to this flask. After that 5 ml perchloric acid was added to this flask. The Micro Kjeldahl flask containing the sample and acid mixture was placed in an Electrothermal heater and heated at 30⁰ – 80⁰C. Heating started at 30⁰C and gradually heating temperature was increased to 80⁰C. During heating the colour of the liquid in flask (sample + acid mixture) was turned into reddish colour, which was turned into white colour afterwards. Then the flask with the contents was cooled. Then 6N 6 ml HCl was added to the flask. The Micro-Kjeldahl flask with its contents was placed in the Electrothermal heater and heated at 30⁰– 80⁰C. Heating temperature gradually increased from 30⁰C to 80⁰C. This time the colour of the liquid (sample + acid) in flask was first yellow colour which was turned into white colour afterwards. Then the flask with its content was cooled. The content of the flask was taken in a 50 ml volumetric flask. The volume was made up to the mark (50 ml) by distilled water according to Eboh et al. (2006). This solution was filtered by ash less Whatman No.1 filter paper. Atomic Absorption Spectrophotometric Analysis This digested solution was then subjected to Atomic Absorption Spectrophotometric analysis according to the method of Clesceri et al. (1989). The absorbance of the colour of the solutions was measured by Atomic Absorption Spectrophotometer at a specific wave length. The wave length for such measurement was for As, Cr and Cd was 193.7, 127 and 217 nm, respectively. The absorbance and corresponding concentration of heavy metal was observed or determined from a standard graph which was previously prepared by standard compound of heavy metal.

Source of Information: J. Environ. Sci. & Natural Resources, 10(1): 55-60, 2017 ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

On the basis of this experiment it is confirm that all the nutritional component present in satisfactory level. TVB-N and TMA-N value sometimes high but within the range. Except Lead (Pb) and Chromium (Cr) all heavy metals are in tolerable level. So all parameters shows that experimented sun dried fish is inacceptable quality.

Knowledge Management: Journal