What are the test results in terms of lab results?
We have found that Nitro flushing does in fact prolong and stabilize coffee. In simple taste tests, comparing nitro flushed coffee, to non-nitro (valve bag) coffee the results are significantly different. When we shipped our nitro flushed bag for testing the residual O2 levels were less than 1.5%. While we did not ship comparative bags of non-flushed bags for testing, the proof was in the pudding, or in the cup. After 24 days, the espresso was awesome when pulled from the nitro flushed bag, but flat and baggy when pulled from an ordinary, one-way valve bag. So in short, our testing has shown that nitro flushing does preserve freshness and offer stabilization, at least in talking about espresso. Further, we have tested this on Esmeralda, and found the same results.
Passionate Student of Coffee