Bardyn M, et al. – This research aspired to monitor the antioxidant power (AOP) in erythrocyte concentrates (ECs) during cold storage. The significant rise in AOP during the first week of storage indicated that RBCs were affected early by the modification of their environment. The AOP behaviour reflected the variations in metabolism activity following the adjustment of the extracellular uric acid level. The knowledge regarding origin, interdonor variability and the effects of the AOP on the RBCs could be beneficial for the storage quality.