Those of us who preserve or vaccuum seal food for long-term storage know that oxygen is a leading cause of spoilage.
Here are a few articles that discuss home food preservation techniques, vaccuum sealingn and the use of nitrogen. Each article offers a good discussion and a somewhat different approach to the process.
http://www.motherearthnews.com/Real-Food/1999-08-01/Vacuum-and-Nitrogen-Packing.aspx
http://waltonfeed.com/old/self/upack/nitrogen.html
http://bulk-survival-food.com/oxygen-absorbers-versus-nitrogen-packing/99
http://theepicenter.com/tow08237.html
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