Reduction of Bacillus cereus spores in sikhye, a traditional Korean rice beverage, by modified tyndallization processes with and without carbon dioxide injection

H. Kim, H. Kim, J. Bang, Y. Kim, L. R. Beuchat, Jee-Hoon Ryu

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Aims: The objective of this study was to inactivate Bacillus cereus spores in sikhye using a modified tyndallization process involving injection with carbon dioxide (CO2). Methods and Results: Heat tolerance of B. cereus spores in tryptic soy broth and sikhye was evaluated. The D95°C values of the B. cereus spores were 2·8-4·9min, 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 CO2 > modified tyndallization without CO2 > conventional heat treatment. Modified tyndallization with CO2 reduced the number of B. cereus spores in sikhye by 5·8logCFUml-1. The increased CO2 concentration and decreased pH of sikhye resulting from CO2 injection rapidly reverted to near-normal values after heat treatment. Conclusions: Modified tyndallization with CO2 was more effective than conventional heat treatment or modified tyndallization without CO2 in reducing B. cereus spores in sikhye. Significance and Impact of the Study: Results of this study will be useful when developing strategies to control B. cereus spores in sikhye and may have application to other beverages.

Original languageEnglish
Pages (from-to)218-223
Number of pages6
JournalLetters in Applied Microbiology
Volume55
Issue number3
DOIs
Publication statusPublished - 2012 Sep 1

Fingerprint

Bacillus cereus
Beverages
Spores
Carbon Dioxide
Injections
Hot Temperature
Therapeutics
Oryza
Heating
Reference Values

Keywords

  • Bacillus cereus
  • Carbon dioxide
  • Endospores
  • Rice beverages
  • Sikhye
  • Tyndallization

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology

Cite this

Reduction of Bacillus cereus spores in sikhye, a traditional Korean rice beverage, by modified tyndallization processes with and without carbon dioxide injection. / Kim, H.; Kim, H.; Bang, J.; Kim, Y.; Beuchat, L. R.; Ryu, Jee-Hoon.

In: Letters in Applied Microbiology, Vol. 55, No. 3, 01.09.2012, p. 218-223.

Research output: Contribution to journalArticle

@article{3d0c9632899547b791eab5fa29fa1dbb,
title = "Reduction of Bacillus cereus spores in sikhye, a traditional Korean rice beverage, by modified tyndallization processes with and without carbon dioxide injection",
abstract = "Aims: The objective of this study was to inactivate Bacillus cereus spores in sikhye using a modified tyndallization process involving injection with carbon dioxide (CO2). Methods and Results: Heat tolerance of B. cereus spores in tryptic soy broth and sikhye was evaluated. The D95°C values of the B. cereus spores were 2·8-4·9min, 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 CO2 > modified tyndallization without CO2 > conventional heat treatment. Modified tyndallization with CO2 reduced the number of B. cereus spores in sikhye by 5·8logCFUml-1. The increased CO2 concentration and decreased pH of sikhye resulting from CO2 injection rapidly reverted to near-normal values after heat treatment. Conclusions: Modified tyndallization with CO2 was more effective than conventional heat treatment or modified tyndallization without CO2 in reducing B. cereus spores in sikhye. Significance and Impact of the Study: Results of this study will be useful when developing strategies to control B. cereus spores in sikhye and may have application to other beverages.",
keywords = "Bacillus cereus, Carbon dioxide, Endospores, Rice beverages, Sikhye, Tyndallization",
author = "H. Kim and H. Kim and J. Bang and Y. Kim and Beuchat, {L. R.} and Jee-Hoon Ryu",
year = "2012",
month = "9",
day = "1",
doi = "10.1111/j.1472-765X.2012.03278.x",
language = "English",
volume = "55",
pages = "218--223",
journal = "Letters in Applied Microbiology",
issn = "0266-8254",
publisher = "Wiley-Blackwell",
number = "3",

}

TY - JOUR

T1 - Reduction of Bacillus cereus spores in sikhye, a traditional Korean rice beverage, by modified tyndallization processes with and without carbon dioxide injection

AU - Kim, H.

AU - Kim, H.

AU - Bang, J.

AU - Kim, Y.

AU - Beuchat, L. R.

AU - Ryu, Jee-Hoon

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Aims: The objective of this study was to inactivate Bacillus cereus spores in sikhye using a modified tyndallization process involving injection with carbon dioxide (CO2). Methods and Results: Heat tolerance of B. cereus spores in tryptic soy broth and sikhye was evaluated. The D95°C values of the B. cereus spores were 2·8-4·9min, 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 CO2 > modified tyndallization without CO2 > conventional heat treatment. Modified tyndallization with CO2 reduced the number of B. cereus spores in sikhye by 5·8logCFUml-1. The increased CO2 concentration and decreased pH of sikhye resulting from CO2 injection rapidly reverted to near-normal values after heat treatment. Conclusions: Modified tyndallization with CO2 was more effective than conventional heat treatment or modified tyndallization without CO2 in reducing B. cereus spores in sikhye. Significance and Impact of the Study: Results of this study will be useful when developing strategies to control B. cereus spores in sikhye and may have application to other beverages.

AB - Aims: The objective of this study was to inactivate Bacillus cereus spores in sikhye using a modified tyndallization process involving injection with carbon dioxide (CO2). Methods and Results: Heat tolerance of B. cereus spores in tryptic soy broth and sikhye was evaluated. The D95°C values of the B. cereus spores were 2·8-4·9min, 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 CO2 > modified tyndallization without CO2 > conventional heat treatment. Modified tyndallization with CO2 reduced the number of B. cereus spores in sikhye by 5·8logCFUml-1. The increased CO2 concentration and decreased pH of sikhye resulting from CO2 injection rapidly reverted to near-normal values after heat treatment. Conclusions: Modified tyndallization with CO2 was more effective than conventional heat treatment or modified tyndallization without CO2 in reducing B. cereus spores in sikhye. Significance and Impact of the Study: Results of this study will be useful when developing strategies to control B. cereus spores in sikhye and may have application to other beverages.

KW - Bacillus cereus

KW - Carbon dioxide

KW - Endospores

KW - Rice beverages

KW - Sikhye

KW - Tyndallization

UR - http://www.scopus.com/inward/record.url?scp=84865325560&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84865325560&partnerID=8YFLogxK

U2 - 10.1111/j.1472-765X.2012.03278.x

DO - 10.1111/j.1472-765X.2012.03278.x

M3 - Article

VL - 55

SP - 218

EP - 223

JO - Letters in Applied Microbiology

JF - Letters in Applied Microbiology

SN - 0266-8254

IS - 3

ER -