Published on May 13, 2025
Fresh-cut herbs like celery, parsley, and coriander are staples in culinary and health-focused diets, but their perishability poses challenges for producers and retailers. A new study published in the Journal of Food Measurement and Characterization (May 2025) reveals how gaseous ozone can tackle these challenges, extending shelf life while enhancing quality and safety.
Key Findings from the Study
Researchers at the National Research Centre in Egypt treated fresh-cut celery, parsley, and coriander with 25 ppm ozone gas for 20 minutes and monitored their quality over 7 days at room temperature. Here’s what they found:
- Reduced Weight Loss: Ozone-treated herbs lost significantly less weight than untreated ones. After 7 days, untreated herbs lost 62% of their weight, while ozonated herbs lost only 35%. This is due to ozone’s ability to slow microbial growth and reduce respiration rates, keeping herbs fresher for longer.
- Microbial Safety Boost: Ozone slashed bacterial counts by 1.7-2.5 log cycles and fungal counts by 1.1-1.54 log cycles across the herbs. This makes ozone a powerful, chemical-free alternative to traditional sanitizers like chlorine, which is banned in some regions due to health concerns.
- Enhanced Nutritional Value: Ozone increased phenolic content and antioxidant activity—key health benefits of herbs. For example, celery’s antioxidant activity soared by 77.76%, and coriander’s phenolic content rose by 10.36%.
- Minimal Color Impact: Color changes were insignificant, with a slight increase in lightness and yellowness but no major impact on visual appeal, ensuring herbs remain market-ready.
- Volatile Compound Changes: Ozone altered the herbs’ aroma profiles, reducing some compounds while forming new ones. This could affect flavor, so further research is needed to optimize ozone’s impact on sensory qualities.
Why Ozone for Fresh-Cut Herbs?
Ozone’s benefits align perfectly with the food industry’s push for sustainable, safe preservation methods. It’s FDA-approved as a GRAS (Generally Recognized as Safe) treatment, leaves no harmful residues, and outperforms chlorine by reducing microbial loads without forming carcinogenic byproducts. This study confirms ozone’s role in maintaining herb quality, echoing findings from our previous post on berries.
Practical Applications for Producers
For herb producers and packers, integrating ozone into postharvest processes is straightforward with the right equipment. A treatment of 25 ppm for 20 minutes—achievable with our ozone generators—can significantly extend shelf life, reduce spoilage, and enhance product safety. This not only cuts waste but also boosts consumer trust in your brand’s commitment to quality and sustainability.
Explore Ozone Solutions with Oxidation Technologies
Ready to leverage ozone for your fresh-cut herbs? At Oxidation Technologies, we specialize in custom ozone systems tailored to your needs. Contact us today to learn how ozone can transform your postharvest process and keep your herbs fresh from farm to table.
Read the white paper here:
