Search

Because Goa is a favorite destination for international and national tourism, there is a great demand for seafood there. Formalin (30–40% of formaldehyde, FA) can be added as a preservative to many...

The aim of the study was to investigate the drying kinetics and quality characteristics of Indian mackerel dried under solar–electrical hybrid dryer (S-EHD). Fresh Indian mackerel fishes (Rastrelli...

Trypsin from viscera of Indian mackerel (Rastralliger kanagurta) was purified by ammonium sulphate precipitation and chromatographic techniques such as size exclusion, ion exchange, and affinity chromatography, with a 14.4-fold increase in specific activity and 18.7% recovery. The molecular weight of the trypsin was estimated to be approximately 26 kDa using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Purified trypsin showed amidase-specific activity which was determined using benzoyl-dl-arginine-p-nitroanilide (BAPNA). The optimum pH and temperature for isolated trypsin activity were 9.0 and 50°C, respectively. The purified trypsin was strongly inhibited by soybean trypsin inhibitor (SBTI) and N-p-tosyl-1-lysine chloromethyl ketone (TLCK). Purified trypsin showed almost 40% recovery at high NaCl concentration (30%). The N-terminal amino acid sequence of the first 10 amino acids of purified trypsin was IVGGYESQPH. The Michaelis-Menten constant (Km) and catalytic constant (Kcat) o...

Eight trials were conducted for drying mackerel by a solar biomass hybrid cabinet dryer (S-BHCD) and open sun drying (OSD) at air temperatures of 32.39–57.69°C, relative humidity 23.9–85.8%, and air flow rate of 0.20–0.60 m/s. The solar radiation ranged between 287 and 898 W/m2 during the time of experimentation. At nighttime, drying was carried out by combusting biomass. The initial moisture content of the processed mackerel was 72.50±0.44% (w.b.) and was reduced to the final moisture content of 16.67±0.52% (w.b.) in S-BHCD and 16.92±0.54% (w.b.) in OSD. Eleven drying models were used and the coefficients of determination (R 2) and constants were evaluated by nonlinear regression to estimate the drying curves of dried mackerels. The Midilli model was found to more satisfactorily describe the drying process of mackerel in S-BHCD with R 2 of 0.9999, χ2 of 0.0000374, and RMSE of 0.0057. In the OSD, a two-term drying model satisfactorily described the drying process with R 2 of 0.9996, χ2 of 0.0000519, and R...

Concentrations of polycyclic aromatic hydrocarbons (PAH) were determined in the muscles and the skin of two fish species, Indian mackerel ( Rastrelliger kanagurta ) Indian scad ( Decaptens russelli ) and marine water collected from different places around the Sultanate of Oman, in February and July 1995. Pyrene was the most frequently detected compound with concentration ranging from 42.6 to 405.2 mug kg-1, while benzo(k)fluoranthene was the least frequently detected compound with concentrations ranging from 98.8 to 227.9 mug kg-1. Residues of PAH detected in fish samples have followed no particular pattern and were rather irregular. Concentrations of PAH detected in the two fish species are relatively higher than concentrations detected in seafood around the Gulf Area.

This dissertation presents a series of studies conducted to improve quality characteristics of dried Indian mackerel (Rastrelliger kanagurta) by solar drying. Prior to designing the experiments, a field survey was conducted to assess the socio-economic conditions of small-scale fishers in Maharashtra, India. The survey revealed a lack of proper drying technology as a major constraint. Hence, this research is conducted to develop a cost-effective method for drying of mackerel.