Microbial populations associated with commercially produced South African sorghum beer as determined by conventional and Petrifilm plating.
Int J Food Microbiol
; 43(1-2): 115-22, 1998 Aug 18.
Article
en En
| MEDLINE
| ID: mdl-9761345
ABSTRACT
Microbial populations of 46 commercially produced sorghum beer samples from retail outlets in Johannesburg, South Africa, were enumerated and characterized. Aerobic plate counts, lactic acid bacteria counts and yeast counts were performed by conventional and Petrifilm plating. Conventional methods yielded yeast counts of 7.84 log CFU/ml, lactic acid bacteria counts of 6.44 log CFU/ml and aerobic plate counts of 5.96 log CFU/ml. In comparison, Petrifilm counts were 7.85 log CFU/ml for yeasts, 5.31 log CFU/ml for lactic acid bacteria and 5.34 log CFU/ml for aerobic bacteria. Characterization of 419 predominant bacterial isolates from Standard One Nutrient Agar, MRS Agar and corresponding Petrifilm plates yielded 88.0% lactic acid bacteria, 8.4% Bacillus species, 2.9% Micrococcus species and 0.7% Gram negative bacteria. Composition of predominant lactic acid bacteria populations from Standard One Nutrient Agar and both types of Petrifilm plates showed marginal differences. Increased proportions of heterofermentative lactic acid bacteria were, however, isolated from conventional MRS Agar compared to the modified Petrifilm product which represented the equivalent to MRS Agar.
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Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Cerveza
/
Grano Comestible
/
Microbiología de Alimentos
/
Lactobacillus
Tipo de estudio:
Risk_factors_studies
País/Región como asunto:
Africa
Idioma:
En
Revista:
Int J Food Microbiol
Asunto de la revista:
CIENCIAS DA NUTRICAO
/
MICROBIOLOGIA
Año:
1998
Tipo del documento:
Article
País de afiliación:
Sudáfrica