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Research Journal of Microbiology

Year: 2007 | Volume: 2 | Issue: 3 | Page No.: 247-253
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Authors

A.O. Ijabadeniyi

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Research Article

Microorganisms Associated with Ogi Traditionally Produced from Three Varieties of Maize

A.O. Ijabadeniyi
Aim of this study is to determine the microbial load, isolate and identify microorganisms associated with indiginous fermentation of the different maize varieties. Traditional method of preparation was used to produce ogi using three maize varieties; white local (WM), yellow (YM) and quality protein maize (QPM) varieties. The maize grains were steeped for 72 h, wet milled, sieved and fermented for 48 h separately at 30±2°C by the maize natural microflora. The number and type of microorganisms per mL of the fermenting substrates were estimated daily for the period of the fermentation. The isolated microorganisms were characterized using conventional methods. Molds isolated from the fermenting maize varieties were Aspergillus niger, Penicillium sp., Mucor mucedo, Rhizopus stolonifer and a yeast, Saccharomyces cerevisiae. The bacteria that were isolated were Corynebacterium sp., Lactobacillus plantarum, Lactobacillus fermentum, Leuconostoc mesenteroides, Clostridium bifermentans and Staphylococcus aureus. During the secondary fermentation, the microorganisms had been reduced to Lactobacillus plantarum, Lactobacillus fermentum and yeast, Saccharomyces cerevisiae. Total viable bacteria counts during the fermentation of QPM ranged from 2.0x105 to 3.8x106 cfu mL-1. For YM it ranged from 4.0x105 to 4.0x106 cfu mL-1 and WM; 5.0x105 to 4.0x106 cfu mL-1. Fungal counts during the fermentation of QPM ranged from 1.0x103 to 3.6x104 cfu mL-1. For YM it ranged from 1.0x103 to 3.6x104 cfu mL-1 and WM; 2.0x103 to 4.0x104 cfu mL-1. Lactobacillus sp. and Saccharomyces cerevisiae were responsible for the quality characteristics of ogi. QPM had a reduced number and type of microorganisms compared to other two varieties.
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