Inactivation of Bacillus spores by the combination of moderate heat and low hydrostatic pressure in ketchup and potage

Md Shahidul Islam, Ayaka Inoue, Noriyuki Igura, Mitsuya Shimoda, Isao Hayakawa

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The combination effect of moderate heat and low hydrostatic pressure (MHP) on the reduction of Bacillus subtilis, Bacillus coagulans and Geobacillus stearothermophilus spores in food materials (potage and ketchup) was investigated. These bacterial spores were suspended in potage (pH 7), acidified potage (pH 4), neutralized ketchup (pH 7) and ketchup (pH 4). The suspensions were treated with and without pressure (100 MPa) and temperatures of 65-85°C for 3 to 12 h. The bacterial spores were inactivated by 4-8 log cycles during MHP treatment in potage, acidified potage and ketchup, whereas the spores were highly resistant to long time heat treatment in potage and neutralized ketchup. The degrees of spore destruction were mostly dependent on pH and medium composition during MHP treatment. The inactivation effect in MHP treatment was higher at the pH 7 than at pH 4 both in ketchup and potage. The bacterial spores showed higher inactivation in potage than ketchup during MHP treatment.

Original languageEnglish
Pages (from-to)124-130
Number of pages7
JournalInternational Journal of Food Microbiology
Volume107
Issue number2
DOIs
Publication statusPublished - Mar 15 2006

All Science Journal Classification (ASJC) codes

  • Food Science
  • Microbiology

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