date:Dec 05, 2012
freshness cues from a slice of tomato or a leaf of lettuce. While meat, cheese and bread are effectively 'dead', produce is still 'alive', or at least respiring. It needs the oxygen that MAP removes or else it will wilt, which is why produce packaging uses a permeable micro-perforated film to allow the exchange of gases. Meats, breads and other non-respiring ingredients need barrier films, which are not permeable.
Extended shelf-life
While MAP can increase shelf-life by as much as 30 days, it