Scalable thermal pasteurization strategy for cocoa liquor
This innovative pasteurization method leverages temperature and water activity to effectively reduce bacterial presence in cocoa liquor while preserving quality. By modulating water activity during processing, it achieves rapid microbial reduction without compromising flavor or texture.
Overview
This scalable thermal pasteurization strategy for cocoa liquor introduces a novel approach to pathogen control by leveraging the synergistic effects of temperature and water activity (aw). Traditional methods face challenges due to bacteria's high thermal tolerance in lipid-rich environments. This innovative solution uses a controlled, temporary adjustment of the product's moisture environment during processing, significantly reducing the thermal resistance of target bacteria. This allows for a rapid reduction in Total Viable Count (TVC) at moderate temperatures (70–95 °C), thereby preserving the essential organoleptic profile and rheological properties of high-quality cocoa products.
Technical specifications
- Controlled Water Activity: By increasing the water activity from 0.23 to 0.43, the thermal resistance of bacteria is reduced tenfold, allowing for faster pasteurization.
- Temperature Range: Effective microbial inactivation is achieved within a temperature range of 70–95 °C.
- Equipment Used: Utilizes a Scraping-Surface Heat Exchanger (SSHE) to uniformly heat the cocoa liquor.
- Quality Preservation: The method prevents Maillard browning and off-flavors, maintaining the cocoa's natural flavor and texture.
Technology readiness level
Currently at Technology Readiness Level 5, this pasteurization strategy has undergone lab-scale modeling and TVC analysis, establishing its efficacy in controlled environments. Future validation includes quality and process evaluation, followed by pilot validation and scale-up to ensure industrial applicability and effectiveness.
About South Dakota State University
South Dakota State University is a comprehensive public land‑grant research university serving a large statewide community. Industry engages through a university‑linked research and technology park that colocates tenant companies with faculty labs and pilot‑scale processing suites for de‑risking and demonstration. A statewide extension network and field sites provide real‑world environments for validation and market feedback, while shared‑use core facilities and tailored workforce pipelines connect talent and tools to corporate R&D. Research is supported by competitive federal funding from USDA and NSF, with additional awards from NIH and DOE, alongside state and industry partnerships. A dedicated technology transfer office manages IP and industry agreements, and incubator space at the research park supports startup formation and scale‑up.
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