Moderate electric field treatment for bacterial inactivation in cocoa liquor
This solution leverages moderate electric fields (MEF) to inactivate bacteria in cocoa liquor, offering a gentler alternative to pulsed electric fields. Implementable during conching, it enhances food safety without compromising chocolate quality.
Overview
Moderate electric field (MEF) treatment is an innovative method designed to improve food safety by inactivating pathogenic bacteria in cocoa liquor. Unlike pulsed electric fields, MEF applies a gentler electric field, reducing the risk of uneven heating and potential hot spots. This process is particularly advantageous in chocolate production, as it can be seamlessly integrated into conching operations—an essential step in chocolate manufacturing—ensuring the inactivation of harmful bacteria like Salmonella without compromising the product's quality.
Technical specifications
- Electric field strength: 1-100 V/cm, extendable up to 1000 V/cm.
- Temperature: Effective at 55°C with continuous shearing at 300 s^-1.
- Bacterial reduction: Achieves a 5-log reduction in Salmonella within 10 minutes under trial conditions.
- Integration: Can be retrofitted into existing conching vats, allowing for extended treatment times and enhanced safety.
- Conductivity: The low conductivity of cocoa liquor makes ohmic heating manageable.
Technology readiness level
This technology is at TRL 3, having been validated in controlled trials showing significant bacterial reduction. Future plans include further pathogen inactivation studies, quality assessment of treated cocoa liquor, and potential design modifications for industrial integration.
About The Ohio State University
The Ohio State University is a comprehensive public land‑grant research university in Columbus, serving one of the nation’s largest student populations and a broad research enterprise. Industry partners engage through an integrated academic medical center for clinical translation, a campus‑adjacent innovation district for co‑located projects, and a statewide extension network that pilots solutions across Ohio. Corporate engagement provides a single front door for sponsored research, talent pipelines, and streamlined agreements. Research is supported by competitive federal funding from agencies such as NIH, NSF, DOE, USDA, DoD, and NASA. A dedicated technology transfer office and venture support help protect IP, license technologies, and launch startups.
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