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.