Hot-fresh beef needs a temperature strategy, not simply colder transport

Transport temperature has a decisive influence on the colour of hot-fresh beef. A paper published on 3 September simulated post-mortem transport of bovine longissimus muscle at 4, 16 and 26°C during the first 48 hours. Its findings do not support a simple “the colder, the better” rule; instead, they describe a balance between bright-red colour development, metabolism and oxidation. At 4°C, colour remained more stable and both energy metabolism and oxidation were slowed. However, oxymyoglobin formation—the pigment associated with a bright red appearance—also developed more slowly. At 26°C, glycolysis and ATP depletion progressed rapidly; myoglobin and lipid oxidation increased, and colour deteriorated sooner. The intermediate 16°C condition promoted a fresh red appearance, but produced the highest malondialdehyde level, an indicator of lipid oxidation. The authors connect visible colour to several mechanisms progressing at the same time: pH decline, oxygen availability, pigment conversion and lipid oxidation. In their data, pH was positively associated with both metmyoglobin and malondialdehyde. This reinforces that colour should not be assessed in isolation; it reflects the interaction between muscle metabolism and thermal exposure. For practice, the study does not define one universal transport temperature. It does provide an operational warning: cold-chain control for hot-fresh meat should be designed around duration, product format, airflow, destination and presentation objective. Where an attractive red appearance is sought without compromising oxidative stability, protocols need validation for each logistics flow rather than being derived from one temperature setpoint.