Inactivation of Salmonella Enterica Serovar Typhimurium and Quality Maintenance of Cherry Tomatoes Treated With Gaseous Essential Oils

J Food Sci. 2013 Mar;78(3):M458-64. doi: 10.1111/1750-3841.12052. Epub 2013 Feb 8.

Abstract

The antimicrobial activity of the essential oils (EOs) from cinnamon bark, oregano, mustard, and of their major components cinnamaldehyde, carvacrol, and allyl isothiocyanate (AIT) was evaluated as a gaseous treatment to reduce Salmonella enterica serovar Typhimurium in vitro and on tomatoes. In vitro tests showed that mustard EO and AIT had the greatest inhibition of Salmonella, followed by cinnamon EO and cinnamaldehyde, while oregano and carvacrol showed the least inhibition. Scanning electron microscopy images of S. Typhimurium on tomatoes suggest that the EOs and their major components damaged the bacteria, and the damage was more obvious after posttreatment storage at 10 °C for 4 and 7 d. Salmonella on inoculated tomatoes was reduced by more than 5 log colony forming units (CFU)/g by mustard EO and AIT, by 4.56 and 3.79 log CFU/g following cinnamon EO and cinnamaldehyde treatments, respectively, and 1.54 and 3.37 log CFU/g after oregano EO and carvacrol treatments, respectively. Mustard EO and AIT induced discoloration, softening, and loss of the vitamin C and lycopene during 21 d of storage at 10 °C, while treatment with cinnamon EO and cinnamaldehyde did not result in significant changes in tomato quality. Tomatoes treated with oregano EO had better quality than nontreated samples after storage. Therefore, treatment with cinnamon and oregano EO and their major components appeared to be feasible for inactivation of Salmonella on tomatoes and maintaining quality.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acrolein / analogs & derivatives
  • Acrolein / pharmacology
  • Anti-Bacterial Agents / pharmacology*
  • Ascorbic Acid / analysis
  • Cinnamomum zeylanicum / chemistry
  • Colony Count, Microbial
  • Cymenes
  • Food Contamination / prevention & control*
  • Food Microbiology
  • Food Preservation / methods
  • Food Storage / methods
  • Isothiocyanates / pharmacology
  • Lycopersicon esculentum / drug effects*
  • Lycopersicon esculentum / microbiology*
  • Monoterpenes / pharmacology
  • Mustard Plant / chemistry
  • Oils, Volatile / pharmacology*
  • Origanum / chemistry
  • Plant Extracts / pharmacology
  • Salmonella typhimurium / drug effects*

Substances

  • Anti-Bacterial Agents
  • Cymenes
  • Isothiocyanates
  • Monoterpenes
  • Oils, Volatile
  • Plant Extracts
  • Acrolein
  • carvacrol
  • allyl isothiocyanate
  • Ascorbic Acid
  • cinnamic aldehyde