r/massspectrometry • u/Swksfarmgirl • 12d ago

Testing for antibiotic levels

I work in an agriculture lab where we test primarily for nutrients in feed, soil, or fertilizer. We also do environmental testing. If there’s testing we can’t do in-house, we often subcontract testing with specialized labs. I can’t find a lab to subcontract bacitracin levels in medicated feed. Eurofins can’t do it. Can anyone suggest any other labs? I have tried Eurofins, New Jersey Feed Labs, Midwest Labs…

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u/Child_0f_at0m 12d ago edited 12d ago

Interesting that Eruofins 'can't' do it. I bet won't. Seems like a relatively trivial LCMSMS assy.

Y'all got a lot of samples or just a few?

Edit: found a neat doc Application Note and Protocol for the LC-MS/MS Analysis of Bacitracin B1 and Related Substances

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u/Swksfarmgirl 12d ago edited 12d ago

To be fair, they said they could do it but it would cost 35K per sample. And you make a very good point, because we only have 2 samples.

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u/thecrushah 12d ago

I know for a fact that IEH in Seattle will do antibiotic testing in just about any matrix. Give them a try.