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Articles by A.K. Akintokun
Total Records ( 3 ) for A.K. Akintokun
  A.K. Akintokun , G.A. Akande , P.O. Akintokun , T.O.S. Popoola and A.O. Babalola
  The ability of thirty-one fungal strains isolated from Nigerian cultivated farmland to solubilize rock phosphate and tri-calcium phosphate (TCP) was investigated. pH, titratable acidity, available phosphorus, total phosphorus and organic acid released were analysed as a measure of solubilization ability in liquid based medium containing rock phosphate and TCP. Isolated fungal species belong mainly to the genera of Aspergillus, Penicillium, Trichoderma, Fusarium, Mucor, Ovularopsis, Tritirachium and Geotrichum. Apart from Geotrichum, all the isolates were able to solubilize phosphate rock and TCP. Phosphate solubilization was accompanied by a decrease in the pH of the medium by all the strains; however, this decrease differed significantly among isolates (p<0.05). The production of fumaric, acetic, gluconic, lactic and succinic acids accompanied solubilization of TCP, while citric, fumaric, malic and tartaric acid were detected in extracts of phosphate rock medium. Significant differences (p<0.05) were observed in the type and amount of organic acids produced by the fungi species Aspergillus terreus produced the highest amount of fumaric acid (264.45 mg/100 mL in TCP medium, while A. niger produced the highest amount of malic acid (18.20 mg/100 mL) in rock phosphate medium Succinic acid was the least produced of the acids.
  T.O.S. Popoola , O.D. Yangomodou and A.K. Akintokun
  An assessment of the antimicrobial activity of oil extracted from cassava (Manihot esculenta. Crantz) seeds was investigated using agar-well diffusion method against clinical isolates of Staphylococcus aureus, Propionibacterium acnes, Escherichia coli, Pityrosporium ovale and Candida albicans which were isolated from skin infections. The results of the investigation showed that cassava seed oil had inhibitory effect on the growth of all the test isolates. Significant differences (p<0.05) were observed in the degree of inhibition of the isolates, but non-significant variations were observed in inhibition among strains of the same species. The most pronounced inhibition as confirmed by the zones of inhibition around growing colonies was on S. aureus; P. acnes was moderately inhibited, while inhibition of growth of E. coli was mild. Growth inhibition by the oil was not significant (p>0.05) between P. ovale and C. albicans. The inhibitory ability of the oil decreases with a decrease in concentration of oil in the solvent, resulting in marked variation in the minimum inhibitory concentration. The implication of this observation is that the oil may be of medical and particularly dermatological importance
  A.M. Omemu , M.O. Bankole , O.B. Oyewole and A.K. Akintokun
  The populations and profiles of moulds and yeasts species present in ogi during fermentation and storage at room temperature until spoilage sets in were determined. Yeasts counts increased throughout the fermentation period while moulds were present till 12 h of soaking; thereafter no mould population was observed again. During the storage period, initial yeasts counts (4.62±1.05 log cfu g-1) in the corn steep liquor increased and peaked at 8.96±2.00 log cfu g-1 on day 12, then reduced thereafter. Moulds were not isolated until day 10 and day 12 in the corn steep liquor and the ogi samples, respectively. The moulds isolated during storage include A. niger, A. flavus, Rhizopus nigrican and Penicillium sp. while the yeasts are Saccharomyces cerevisiae (strain 1), Candida krusei (strain 1), C. krusei (strain 2), C. tropicalis, C. vini (strain 1) and Geotrichum candidum. The percentage of occurrence of A. niger was 12% on the 8th day, this however increased to 56% by the 20th day. Saccharomyces cerevisiae (18%) present at the beginning of storage reduced to 2% by the 10th day of storage while Candida krusei (15%) increased to 28% by day 20.
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