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Josh

Protein Precipitation in Bottled Absinthe

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Hi all,

Our absinthe is building a small amount of protein solids after sitting in the bottle for a few weeks. The solids dissolve back into solution with a little agitation, but was curious if anyone else has had issues along these lines and what they did to remedy the issue. Our basic process is distill, botanical soak, course filter, rest in stainless, and then 1um filter in pre bottling. I thought the 1um PP filter would pull out these prior to bottling, but I was clearly mistaken.

We tested chilling the absinthe down in the lab to see if chill filtering would work, but it did not seem to cause proteins to fall out, at least in our bench trial.

If anyone would be willing to share their secrets on the matter, I would much appreciate it.

Thanks,

Josh

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How are you sure they are proteins?

 

How long is your initial rest?

 

At what point in time of your process are you proofing your spirit, with what type of water, and how long are you taking to do that proofing?

 

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probably colloidal instability.  Pall filters may help (can't speak to your exact specifications).  It's also possible that your filters are getting overloaded - it may help to rack the spirit too.  Are they absolute or nominally rated?

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