Patricia F. OMOJASOLA1, Folakemi ADENIRAN1, *Bolanle K. SALIU1, and Muinat O. KAZEEM1
1. Department of Microbiology, Faculty of Life Sciences, University of Ilorin, P.M.B. 1515, Ilorin, 240003, Kwara State, Nigeria.
*Corresponding author: Dr. Bolanle Kudirat SALIU
Department of Microbiology, Faculty of Life SciencesUniversity of Ilorin, P.M.B. 1515, Ilorin, 240003, Kwara State, Nigeria.
 08023093294
Abstract
Collagenase producing microorganisms are crucial for efficient utilization of collagen in food and pharmaceutical industries and fish scales play vital role as inducers. Collagen degrading fungi were isolated from fish scale waste dumps. Proximate analysis of the scales of Tilapia (Oreochromis niloticus) and Croaker (Pseudotolithus senegalensis) fishes was determined. Ground scales of the fishes were separately used in submerged fermentation for the production of collagenase by isolated fungi. Fermentation conditions were varied and the factors that favored highest yields were combined in a single process. Protein was found to be the highest component of the scales of Tilapia (62.36%) and Croaker (54.29%) fishes. Collagenase activities of 0.326 U/mL and 0.277 U/mLfrom Aspergillus flavus and 0.269 U/mL and 0.245 U/mL from Aspergillus terreus were produced respectively on Tilapia and Croaker scales. Activities were optimized at 37 °C, pH 7.5, and 1% substrate concentration in the presence of CaCl2 salts with Tilapia scales resulting in a significant improvement up to 31%. In conclusion, A. flavus and A. terreus have collagenolytic activity and the scales of Tilapia and Croaker fishes are suitable as substrate for collagenase production.
Keywords: Aspergillus flavus, Aspergillus terreus,Collagenase, fish scales,
Résumé
Les micro-organismes producteurs de collagĂ©nase sont cruciaux pour une utilisation efficace du collagène dans les industries alimentaires et pharmaceutiques et les Ă©cailles de poisson jouent un rĂ´le vital en tant qu’inducteurs. Des champignons dĂ©gradant le collagène ont Ă©tĂ© isolĂ©s des dĂ©charges de dĂ©chets d’Ă©cailles de poisson. L’analyse immĂ©diate des Ă©cailles de Tilapia (Oreochromis niloticus) et de Croaker (Pseudotolithus senegalensis) a Ă©tĂ© dĂ©terminĂ©e. Les Ă©cailles du sol des poissons ont Ă©tĂ© utilisĂ©es sĂ©parĂ©ment dans la fermentation submergĂ©e pour la production de collagĂ©nase par des champignons isolĂ©s. Les conditions de Fermentation Ă©taient variĂ©es et les facteurs qui favorisaient les rendements les plus Ă©levĂ©s ont Ă©tĂ© combinĂ©s en un seul processus. La protĂ©ine est la composante la plus Ă©levĂ©e des Ă©cailles des poissons Tilapia (62,36%) et Croaker (54,29%). Des activitĂ©s de collagĂ©nase de 0,326 U/mL et de 0,277 U/mL d’Aspergillus flavus et de 0,269 U/mL et de 0,245 U/mL d’Aspergillus terreus ont Ă©tĂ© produites respectivement sur des Ă©cailles de Tilapia et de Croaker. Les activitĂ©s ont Ă©tĂ© optimisĂ©es Ă 37 °C, pH 7,5 et concentration de substrat de 1% en prĂ©sence de sels de CaCl2 avec des Ă©cailles de Tilapia, ce qui a entraĂ®nĂ© une amĂ©lioration significative jusqu’Ă 31%. En conclusion, d’Aspergillus flavus et d’Aspergillus terreus ont une activitĂ© collagĂ©nolytique et les Ă©cailles de Tilapia et de Croaker sont appropriĂ©es comme substrat pour la production de collagĂ©nase.
mots clés: Aspergillus flavus, Aspergillus
terreus, collagénase, écailles de poisson,