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Background. Starch, a homopolysaccharide is an important and an abundant food reserve and energy source. Starches are processed to yield different products which find many industrial applications. Material and methods. Screening of the isolates for amylolytic activity was carried out by growing bacteria isolated from the soil in starch agar plates and subsequently staining the plates with iodine solution to reveal zones of hydrolysis of starch. The selected isolate, Bacillus subtlis CB-18 was grown in different media at alkaline pH to evaluate the influence of media composition on alkaline ?-amylase production. Enzyme assay was carried out by growing the culture in a broth medium and obtaining cell - free culture supernatant after centrifugation at 2515 × g for 15 minutes Amylase activity was determined by incubating 0.5 ml of crude enzyme solution in 0.1M Tris/HCl buffer (pH 8.5) with 0.5 ml of 1% soluble starch solution. The reaction was terminated by the addition of DNS reagent and reducing sugar produced from the amylolytic reaction was determined. Results. Bacillus subtilis CB-18 used for this work was selected because it produced 7 mm zone diameter on starch agar plate. This organism was cultured in different alkaline broth media containing 2% soluble starch as inducer carbohydrate for ?-amylase production. Among the carbon sources used for enzyme production, sorbitol was the best to stimulate enzyme production with ?-amylase activity of 758 U/mL after 48 h. Peptone was the best nitrogen source for enzyme production with ?-amylase activity of 680 U/mL after 48 h. Metal ions including Ca 2+, Mn2+ and Mg2+ stimulated enzyme production while Hg2+ and Ag+ repressed enzyme production. The best enzyme yields were observed in basal media containing agro-based substrates. Conclusion. This work reports the production of alkaline ?-amylase by Bacillus subtlis CB-18 in different media. Enzyme production was highest when agro-based media were used to formulate the media.
Industrial Microbiology and Biotechnology Laboratory, Department of Microbiology, University of Nigeria, Nsukka, Nigeria.
This article was published in the following journal.
Name: Acta scientiarum polonorum. Technologia alimentaria
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Any liquid or solid preparation made specifically for the growth, storage, or transport of microorganisms or other types of cells. The variety of media that exist allow for the culturing of specific microorganisms and cell types, such as differential media, selective media, test media, and defined media. Solid media consist of liquid media that have been solidified with an agent such as AGAR or GELATIN.
Viruses whose host is Bacillus. Frequently encountered Bacillus phages include bacteriophage phi 29 and bacteriophage phi 105.
Culture media containing biologically active components obtained from previously cultured cells or tissues that have released into the media substances affecting certain cell functions (e.g., growth, lysis).
The means of interchanging or transmitting and receiving information. Historically the media were written: books, journals, newspapers, and other publications; in the modern age the media include, in addition, radio, television, computers, and information networks.
A ceramidase subtype that is active at alkaline pH. It is found at high levels within the SMALL INTESTINE.
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