Has anyone dealt with janoshik vs in-house testing?

PeptideChemSF said:

My HPLC chromatogram analysis for certificates of analysis — I sent my batch to Janoshik and here's what the results showed: Main peak retention time:…

I tested my certificates of analysis batch through Janoshik — 97.0% purity. That's within acceptable range for compounded peptides. Turnaround was 10 business days.

The test costs ~$126 but gives you actual HPLC chromatography data plus mass spec confirmation. For the peace of mind alone, it's worth every penny. I test every new batch from a new vendor.

Following on from PeptideChemSF — and this may be the naive question:

How would you tell the difference between that and the alternative explanation?

bri_stats said:

I tested my certificates of analysis batch through Janoshik — 97.0% purity.

COA red flags for certificates of analysis — here's what to look for when reviewing a Certificate of Analysis:

• No HPLC data: If there's no chromatography graph, it's not a real COA
• Exact 100% purity: Suspicious — real testing always shows slight variation
• No batch number: Can't trace back to specific production
• No endotoxin testing: For injectables, this is essential
• Template looks like it was made in Word: Professional labs have standardized formats

I have seen fake COAs that are literally photoshopped. Always verify independently if possible.

bri_stats said:

I tested my certificates of analysis batch through Janoshik — 97.0% purity.

True, with the qualification that this is a self-selected group. The people for whom it did not work post less, and that shapes everything we think we know.

bri_stats said:

I tested my certificates of analysis batch through Janoshik — 97.0% purity.

Bookmarking. The distinction being drawn above is the one nobody else makes. I will report back once I have actually tried it.