Gaseous Ozone Decontamination of Natural Cocoa Press Cake - Mechanistic constraints, microbiological validation, oxidative quality, and a spatially resolved industrial research framework

Natural cocoa press cake is a compact, heterogeneous intermediate produced by expressing cocoa butter from cocoa liquor. Its position before powder milling makes it an attractive candidate for a targeted antimicrobial intervention. Gaseous ozone (O3) is a potent oxidant, but antimicrobial activity observed in other low-moisture foods cannot be transferred directly to cocoa cake. The critical barriers are restricted gas access, rapid oxidant consumption by the food matrix, nonuniform microbial localization, and potential oxidative changes in lipids, polyphenols and volatile compounds. This review critically distinguishes established evidence from proposed cocoa-specific hypotheses and develops a spatially resolved validation framework coupling fragment geometry, locally delivered ozone exposure, microbial lethality and product-quality constraints. The proposed sequence is pressing, controlled fragmentation, ozone contact, residual ozone destruction, and hygienic milling. A staged screening and confirmatory validation plan is provided. Currently available evidence supports investigation but does not establish a universally validated ozone lethality process for cocoa press cake. Commercial application requires matrix-specific challenge studies, quality testing, industrial hygienic design and jurisdiction-specific regulatory assessment.