Longer aged, less colour-stable: What the muscle loses along the way

Wet ageing improves tenderness, but longer ageing does not affect every quality attribute in the same way. A study published in the Journal of Food Science investigated why wet-aged steaks lose redness more quickly during retail display as ageing time increases. Longissimus lumborum muscles were aged for three, seven, 14, 21 and 28 days. Surface colour, mitochondrial function, antioxidant capacity and metabolites were then measured during a six-day display. Steaks aged for 28 days showed a 30.4 per cent greater decline in redness than steaks aged for only three days. The mechanism extends beyond the visible surface. Longer ageing reduced oxygen consumption, mitochondrial protein content and antioxidant capacity. Metabolites capable of supporting NADH regeneration also declined. NADH matters because it contributes to the reduction of brown metmyoglobin back towards more colour-stable myoglobin states. When this reducing capacity weakens and oxidative stress rises, meat loses its red colour faster during display. This creates a familiar practical trade-off. Ageing time may increase tenderness while reducing the remaining colour stability after opening and repacking. An ageing claim should therefore not be reduced to the highest possible number of days. The timing of sale, portioning, oxygen exposure and display is equally important. The study used a defined muscle under controlled conditions and does not provide a universal shelf-life figure. It does, however, explain why ageing and subsequent presentation must be planned as one process. The desired tenderness gain and the available colour window belong in the same quality decision.