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Reduction of date microbial load with ozone.

Davood Farajzadeh1, Ali Qorbanpoor, Hasan Rafati

  • 1Health Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.

Journal of Research in Medical Sciences : the Official Journal of Isfahan University of Medical Sciences
|October 15, 2013
PubMed
Summary

Ozone disinfection effectively reduces microbial load in dates, offering a safer alternative to conventional chemical treatments. This method enhances food safety and extends the shelf life of dates.

Keywords:
Datefood safetymethyl bromidemicrobial loadozone

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Area of Science:

  • Food Science
  • Microbiology
  • Food Preservation

Background:

  • Dates are a globally consumed food product from tropical regions.
  • Conventional disinfection methods (methyl bromide, phosphine) pose toxic risks.
  • Food safety concerns drive the search for safer disinfection agents like ozone.

Purpose of the Study:

  • To evaluate ozone as a replacement for conventional disinfectants in date treatment.
  • To determine the efficacy of ozonation for reducing microbial load on dates.
  • To assess the impact of ozonation on date shelf life.

Main Methods:

  • Date samples were exposed to ozone at concentrations of 5 and 10 g/h for 3 and 5 hours.
  • Ozonated and non-ozonated samples were stored at 25°C and 40°C for 9 months.
  • Microbial load (bacteria, mold, yeast) was assessed every 3 months.

Main Results:

  • Ozonation significantly reduced mold, yeast, and bacterial loads.
  • The most effective microbial reduction was achieved with 10 g/h ozone for 3 hours (53% mold/yeast, 76% bacteria).
  • Ozone treatment demonstrated a dose-dependent effect on microbial reduction.

Conclusions:

  • Ozone disinfection is a viable and effective method for reducing microbial contamination in dates.
  • Ozonation can enhance the shelf life of dates by lowering microbial load.
  • This study supports ozone as a safer alternative for date preservation.