having a hard time finding a straight answer to my problem
Making wine is really easy. One of the hardest parts is wading through all the opinions, incorrect information, and partial truths. It's customary to wait 24 hours from adding campden to pitching yeast. Customary meaning lots of people follow this practice and it's written in tons of recipes.
When everything is added to the must up front, it's not known what works and what doesn't. At the end of the day, wine is made. So, since wine is made, that's proof that there is no problem, right?
Well, not according to research, documentation, and many wine making professionals/chemists. The truth is, some of the additives totally inhibit others. It is known (at least known by some
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) that SO2 at high levels can inhibit enzymes and one of the reasons to judiciously add chemicals to wine. Other additives inhibit/partially inhibit each other, like bentonite.
Getting back to adding campden/SO2, it's best to add SO2 (1 campden tablet/gallon) at the beginning, and then wait at least 12 hours before adding pectic enzyme. As a matter of practice, I wait for another 12 or 24 hours after yeast pitch to add pectic enzyme.
This manual is a great resource for home winemakers and pro's alike. It's jammed packed full of information and helpful articles. For several short "pearls of wisdom" about the interaction of enzymes, check out the light blue graphic block at the bottom of page 111.
https://scottlab.com/content/files/documents/handbooks/scott labs 2024 winemaking handbook.pdf
Cheers,
Barry