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Articles by Oladipo Oladiti Olaniyi
Total Records ( 2 ) for Oladipo Oladiti Olaniyi
  Oladipo Oladiti Olaniyi , Ibitoye Oluyemisi Folasade , Taye Victor Familoni and Emmanuel Olufemi Bankefa
  The present investigation was conducted to generate catabolite activation mutants of Aspergillus flavus through UV mutagenesis. Mutants of A. flavus were generated by exposure of spores suspension to UV irradiation at a distance of 13 cm in dark from the centre of germicidal lamp (240 nm). Quantitatively, mannanase activity was determined using dinitrosalicylic acid method, while protein content was determined by Lowry method. Mannanase production by the mutants varied with time of exposure to UV irradiation. All the mutants except for mutant designated AFUV90 showed higher specific mannanase activity in comparison with the parent strain. The isolated mutants were screened for catabolite activation studies in the presence of different mannose and glycerol concentrations (1 and 1% w/v) as carbon sources. The supplementation of 0.1 and 1% (w/v) mannose in the fermentation media caused activation of mannanase biosynthesis in 100 and approximately 91% of the mutants, respectively. The inclusion of 0.1 and 1% (w/v) glycerol induced an improvement in approximately 82 and 55% of the mutants, respectively in terms of mannanase biosynthesis. The generation of catabolite activation mutants through UV mutagenesis might be considered as a break through in the industrial production of mannanase.
  Oladipo Oladiti Olaniyi , Emmanuel Olufemi Bankefa , Ibitoye Oluyemisi Folasade and Taye Victor Familoni
  This study aimed at the examination of nutrient enrichment of cassava peels and corn cob through mannanase treatment. Mannanase production was conducted using Locust Bean Gum (LBG) as the sole carbon source; moisten with mineral salt solution and enzyme activity determined by dinitrosalicylic acid. Crude mannanase was concentrated by ammonium sulphate. The samples were hydrolyzed with concentrated mannanase within a sealing system. The chemical compositions of enzyme treated-samples were determined according to standard chemical methods. The mineral compositions of the enzyme-treated samples were determined using atomic absorption spectrophotometer method. The result obtained showed an increase in crude protein from 5.34±0.17% in non-enzyme treated corn cob to 9.61±0.98% in enzyme treated corn cob. The enzyme treated samples showed a markedly reduction in crude fiber by 13.75 and 29.70% for cassava peels and corn cob respectively. The lignin (9.49%), cellulose (68.75, 33.06 and 10.82%) and hemicellulose (55.38 and 9.64%) contents decreased in enzyme treated samples for cassava peels and corn cob. Cyanide decreased significantly in all the mannanase-treated samples. Mineral composition varied significantly with treatment type and the substrate treated. The treatment of cassava peels and corn cob with mannanase resulted in the degradation of the complex carbohydrate fractions in the samples to increase its crude protein and certain minerals contents.
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