Internal browning development can be further aggravated by too low O2 concentration (De Castro, 2008). it is promoted by 1 % O2 and 10 % CO2 under cold-storage (Pedreschi et al., 2009). However, O2 concentrations in MAA films (5-9 %) were still considered on a safe limit to stimulate internal browning (Fig. 1 B)