The initial O2 reduction rate, total O2-scavenging capacity and O2 permeability of the barrier films were hypothesized to be the critical factors governing shelf life extension of packaged sponge cakes. Furthermore, a low concentration of ethanol is hypothesized to work synergistically with OS to prolong the shelf life of sponge cake at ambient conditions. EE should help suppressing prolifera- tion of anaerobic microorganisms when OS reduces the headspace O2 below 0.01% without contributing an unacceptable unpleasant odor. Therefore, the objective of this study was to extend shelf life of sponge cake by OS and EE as alternatives to direct addition of chemical preservatives.