Bartho N Okolo

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Thermoactinomyces thalpophilus produced a raw-starch digesting amylase (RSDA) when grown on both cereal and tuber starches. Glucose, maltose and glycerol repressed enzyme production. Highest activity was recorded on rice starch (39 U ml(-1)). Considerable variability existed in the effectiveness of nitrogenous nutrients to stimulate expression of RSDA.(More)
Applications of raw starch digesting amylases (RSDAs) are limited due to instability, product inhibition of enzyme and contamination. RSDA from Aspergillus carbonarius was stabilized through immobilization on agarose gel by adsorption, spontaneous crosslinking and conjugation using glycidol, glutaraldehyde or polyglutaraldehyde. Effects of immobilization on(More)
When microbiological analyses were conducted on 90 samples of soft drinks representing 30 different products commercially available in Nigeria, contaminants were detected in 50% of them. The isolates were mainly saprophytic and non-pathogenic: Bacillus spp. (35%), Lactobacillus spp. (26%), Pediococcus spp. (6%), Staphylococcus epidermidis (6%) and(More)
Raw-starch-digesting enzyme (RSDA) was immobilized on Amberlite beads by conjugation of glutaraldehyde/ polyglutaraldehyde (PG)-activated beads or by crosslinking. The effect of immobilization on enzyme stability and catalytic efficiency was evaluated. Immobilization conditions greatly influenced the immobilization efficiency. Optimum pH values shifted from(More)
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