yes pepsin is a major culprit when it comes to lpr
there must be a grand prize in here somewhere for the chemist who can develop the right spray
maybe something like this?
"Pepsin - Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Pepsin - CachedSimilar
Another type of pepsin inhibitor is 1,1-bis(diazoacetyl)-2-penylethane. This bisdiazoketone inactivates pepsin at pH around 5. The Reaction is usually ..."