06-30-08 02:10 PM - Post#4793 In response to frankcyd
Hi Frank
This is not really a 21 CFR Part 11 topic unless you are relying upon electronic data.
To answer your question (as a non bio chemical person) I would simply spike my bio chemical matrix with a known amount of impurity(s) and measure them with the NMR. Set a tolerance level and hey presto a validated method.