Comparative Study of Sun Drying and Solar Tent Drying of Hyperopisus bebe occidentalis

Pakistan Journal of Nutrition 07/2009; 8(7). DOI: 10.3923/pjn.2009.955.957
Source: DOAJ


An experiment was conducted to investigate the effect of two drying processing methods on the nutritional qualities of Hyperopisus bebe . The two methods used were solar tent dryer and traditional sun drying methods. The experimental fish were dried for 120 h (5 days). The results of proximate analysis showed significant difference (p<0.05) between the two techniques. Organoleptic evaluation showed no physical damage, no discolouration in the treatments and both had firm texture though fishes under traditional sun drying were infected by insects.

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    • "Fish is a highly nutritious food (Ojutiku et al., 2009; Kawarazuka, 2010). It is particularly notable for providing proteins of high quality compared to those of meat or eggs. "

    Preview · Article · Aug 2015
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    • "Several studies have been done on the organoleptic characteristics of various fish species dried by different methods. These include Reza et al. (2009), Ojutiku et al. (2009), Effiong and Fakunle (2012), Oparaku and Mgbenka (2012), Rahman et al. (2012), Ogbonnaya and Ibrahim (2009), Oparaku (2010) Oparaku et al. (2010), Tao and Linchun (2008), Huda et al. (2010) among others. "
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    ABSTRACT: This study was done to evaluate the drying performance, efficiency, and effectiveness of five different types of improved low-cost solar driers in terms of moisture loss from two tropical African fish species Clarias gariepinus (African sharp tooth catfish) and Oreochromis niloticus (Nile tilapia) and testing the organoleptic characteristics of the dried samples. The driers used were made from plastic, aluminum, glass, glass with black igneous stone, and mosquito net, with traditional direct open-sun drying as a control. A significant (P < 0.05) decrease in weight resulting from moisture loss in the two fish species was observed in all the driers, with the highest reduction occurring in the glass drier containing black stone. The rate of weight loss was faster in the first 4 days of drying with black stone-inserted glass drier showing the fastest drying rate with a constant weight in C. gariepinus attained on the 11th day and in O. niloticus on the eighth day. The slowest drier was plastic where a constant weight of the species were recorded on and 13th day and 11th day, respectively. Volunteers were used to assess the organoleptic characteristics of the dried samples and they showed lowest acceptability for the open-sun drying, while samples from the glass drier containing black stone had the highest acceptability in terms of the taste, flavor, appearance, texture, odor, palatability, and shelf-life. The low-cost solar driers were effective found in removing water from the fish resulting in significant loss of weight and moisture. The highest drying time, efficient performance, drying effectiveness, and high acceptability of the organoleptic parameters of the dried products from the black stone-inserted glass drier were due to the ability of the glass and the black stone to retain, transmit, and radiate heat to the fish sample all the time (day and night). These low-cost driers are simple to construct, materials for its construction readily available, easy to maintain and operate, hygienic in use, reliable, effective, occupies less area, dry products faster with increased shelf-life, save man-hour, user-friendly, use renewable energy, protect the drying samples from filthiness, wetness, and invasion by pests, insects, and microbes, with well-dried, high-quality, and better preserved final products. The adoption and use any of these low-cost solar driers by artisanal fishermen and general household in sub-Saharan Africa will not only help in reducing post catch losses, but also ensure food safety and security as there is abundant solar energy in these sub-Saharan African tropical countries for the operation of the driers.
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    ABSTRACT: Traditional sun drying methods are widely used in Bangladesh to dry fish, though the quality is not satisfactory. The aim of this study was to assess the quality of solar tunnel dried Bombay duck and Siler pomfret, and to compare it with traditional sun dried Bombay duck and Silver pomfret. Raw fish samples of Bombay duck and Silver pomfret was collected and dried using solar tunnel dryer. The quality of the dried product was analyzed measuring moisture, protein, fat, ash, peroxide value and Total Volatile Base Nitrogen (TVB-N) content and analyzing water reconstitution properties. Traditional sun dried Bombay duck and Silver pomfret were also collected from different area, and the same measurement was also performed and compared with solar tunnel dried fish samples. Microbial quality was also analyzed using standard methods. Organoleptic quality of solar tunnel dried fish samples was found very well without any objectionable flavor and odor, compared with traditional sun dried fish samples. Moisture content was also observed (15.25 % in Bombay duck and 13.43 % in Silver pomfret) within the acceptable range. Protein content of solar dried fish samples was also found higher than that of traditional sun dried samples and water reconstitution power was also found better. Peroxide and TVB-N value of the solar tunnel dried studied samples were found within the normal limit of 10-20meq/kg of oil and up to 30 mg/100gm, respectively. Aerobic Plate Count was found lower, however Salmonella and Coliform was not found in both dried samples. The quality of solar tunnel dried Bombay duck and Silver pomfret samples were of excellent compared with samples dried by traditional sun drying method.
    Full-text · Article · Oct 2013 · International Journal of Food Sciences and Nutrition
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