High pressure technologies for microbial inactivation in cocoa liquor
Utilizing high pressure processing (HPP) and high pressure homogenization (HPH) to enhance cocoa liquor safety by reducing microbial load while preserving quality attributes like flavor and antioxidant activity.
Overview
This innovative solution employs high pressure processing (HPP) and high pressure homogenization (HPH) to improve the safety and quality of cocoa liquor. By effectively reducing microbial loads, including Salmonella, without the need for heat, these technologies maintain the natural flavor, aroma, and nutritional qualities of cocoa. This approach is particularly beneficial for manufacturers seeking to enhance product safety while preserving desirable sensory attributes.
Technical specifications
High Pressure Processing (HPP):
- Operates at 500–600 MPa for 5–15 minutes at an initial temperature of 30-35°C.
- Utilizes nonthermal mechanisms to inactivate microorganisms by disrupting cell membranes and denaturing proteins.
High Pressure Homogenization (HPH):
- Operates at 100–300 MPa for 1–3 passes with an inlet temperature of 30–35°C.
- Applies intense shear and cavitation forces to reduce microbial counts and preserve cocoa's physicochemical properties.
Both technologies are designed to be integrated into high-throughput continuous processing lines, optimizing production efficiency and ensuring consistent quality.
Technology readiness level
This technology is at TRL 6, having been validated in relevant environments using pilot plant equipment. Studies have demonstrated effective microbial inactivation while maintaining cocoa liquor's sensory and physicochemical properties.
About University of Nebraska, Lincoln
The University of Nebraska–Lincoln is a comprehensive public research university and the flagship campus of the University of Nebraska system, combining land-grant reach with a collaborative, industry-engaged culture. A research and technology park adjacent to campus provides modern wet and dry labs, greenhouses, offices, and conferencing, enabling companies to co-locate with faculty and access shared equipment and pilot environments. A statewide extension network links university expertise with producers and communities, creating rapid pathways for field trials, demonstrations, and workforce pipelines. Research is supported by competitive federal funding from NSF, USDA, DOE, and NIH. A dedicated technology transfer office manages IP, licensing, agreements, and startup formation with industry-friendly terms.
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