All enzymes have a certain pH range at which they work best. Some may be active in a Blast however even if it was, enzymes are different from antioxidants in that they are not "used up".
Enzymes are proteins that are digested just like any other protein. Enzymes must be coated to bypass the acid in your stomach and the other enzymes that may break it down.
If taking a digestive enzymes, I'd suggest taking the supplement either before or during your meal (not in a Blast that would break up the protective coating) and looking for one that has been approved by USP for effectiveness.