| Autor: |
H, Kim, J, Bang, Y, Kim, L R, Beuchat, J-H, Ryu |
| Rok vydání: |
2012 |
| Předmět: |
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| Zdroj: |
Letters in applied microbiology. 55(3) |
| ISSN: |
1472-765X |
| Popis: |
The objective of this study was to inactivate Bacillus cereus spores in sikhye using a modified tyndallization process involving injection with carbon dioxide (CO₂).Heat tolerance of B. cereus spores in tryptic soy broth and sikhye was evaluated. The D(95°C) values of the B. cereus spores were 2·8-4·9 min, dependent of type of heating medium or inoculum level. The lethality of conventional heat treatment and modified tyndallization with or without CO₂ injection against B. cereus spores in sikhye was determined. The order of effectiveness was modified tyndallization with CO₂modified tyndallization without CO₂conventional heat treatment. Modified tyndallization with CO₂ reduced the number of B. cereus spores in sikhye by 5·8 log CFU ml⁻¹. The increased CO₂ concentration and decreased pH of sikhye resulting from CO₂ injection rapidly reverted to near-normal values after heat treatment.Modified tyndallization with CO₂ was more effective than conventional heat treatment or modified tyndallization without CO₂ in reducing B. cereus spores in sikhye.Results of this study will be useful when developing strategies to control B. cereus spores in sikhye and may have application to other beverages. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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