Extraction and characterization of gelatin from Lates niloticus and potential industrial applications

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CHEBON SAMMY KIPLAGAT
JOHN MMARI ONYARI
FRANCIS MULAA
JOHN WABOMBA

Abstract

Abstract. Kiplagat CS, Onyari JM, Mulaa F, Wabomba J. 2017. Extraction and characterization of gelatin from Lates niloticus and potential industrial applications. Biofarmasi J Nat Prod Biochem 15: 53-64. This research aims to extract and characterize gelatin from Lates niloticus (Nile perch) scales, then blend it with polyvinyl alcohol (PVA). Hydrolysis of the scales was done using a crude alkaline protease harvested from a bacterium, Bacillus cereus strain wwcp 1, obtained from Lake Bogoria. The lyophilized solution yielded 16.3% of gelatin powder calculated from the dry weight of the scales. The sample was characterized using infrared spectroscopy and showed peaks at 3442 cm-1, 1653 cm-1, and ~ 1590 cm-1 corresponding to Amide A, Amide I, and Amide II bands, respectively. The amino acid analysis shows that glycine was the most abundant amino acid (21.7%), followed by a proline (14.6%) and alanine (11.8%). Isoleucine, Histidine, and Tyrosine were the least abundant (1.8, 1.4, and 0.9%, respectively). Polyvinyl alcohol-gelatin blend films of various compositions ranging from 10% to 90% PVA were prepared using the solution casting method. Differential Scanning Calorimetry (DSC) and Thermo-gravimetric Analysis (TGA) tests showed the films had glass transition, melting, and thermal decomposition onset temperatures intermediate between those of the respective individual polymers (PVA and gelatin). The thermal stability of the films reduced with the increase in the amount of the less thermally stable constituent. Lastly, potential applications of the prepared blend films were investigated. Batch experiments to assess the potential of the polymer blend films as an adsorbent material were done using Methylene Blue dye. The films were found to adsorb up to 64% of the dye, and the percentage of dye removal varied with the initial concentration of the dye and contact time.

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