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Control of microbiological quality and shelf-life of catfish(Clarias gariepinus)by chemical preservatives and smoking
- Source :
- Journal of Applied Bacteriology. 80:465-470
- Publication Year :
- 1996
- Publisher :
- Wiley, 1996.
-
Abstract
- Fresh catfish (Clarias gariepinus) were subjected to different concentrations of sodium benzoate or potassium sorbate and smoked traditionally before evaluation for microbiological, chemical and organoleptic characteristics during ambient tropical storage. Unsmoked fish samples showed diverse microflora (Enterobacter, Escherichia, Serratia, Bacillus, Staphylococcus, Streptococcus, Penicillium, Aspergillus and Achlya genera) while smoked samples were dominated by Gram-positive bacterial flora (Bacillus, Staphylococcus and Streptococcus) and spoilage moulds (Penicillium verrucosum, Aspergillus flavus and Achlya spp.). Significant reduction in microbial population occurred in most samples following smoking with samples subjected to 0.4% (w/v) potassium sorbate showing the lowest microbial load and maximum shelf-stability. However, marked microbial increase occurred after day 4 of storage in control and benzoate-treated samples. Changes in pH were marginal but decreased after day 12 of storage. Moisture content decreased sharply after smoking and remained low after day 4 of storage. Overall, potassium sorbate treatment (0.4% w/v) was most effective in controlling microbial quality and extended the shelf-life of the samples by 8 d.
- Subjects :
- Clarias gariepinus
Preservative
Population
Food spoilage
Biology
Gram-Positive Bacteria
Benzoates
Applied Microbiology and Biotechnology
Microbiology
chemistry.chemical_compound
Enterobacteriaceae
Smoke
Penicillium verrucosum
Animals
Food science
education
Catfishes
education.field_of_study
Potassium sorbate
Achlya
Benzoic Acid
biology.organism_classification
Sorbic Acid
chemistry
Food Microbiology
Food Preservatives
Mitosporic Fungi
Catfish
Subjects
Details
- ISSN :
- 00218847
- Volume :
- 80
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Bacteriology
- Accession number :
- edsair.doi.dedup.....36ac4da925bcfd86998f1eb447e791ad