Particulate matter testing — USP <788> for injectable peptides

JenPlateau said:

Mass spectrometry confirmation for certificates of analysis: beyond HPLC purity, mass spec tells you the molecule's exact molecular weight.

Same pattern here, and in the same order.

Clinical perspective, offered as context rather than as advice.

Vendor quality matters when discussing certificates of analysis. I've tested my last 4 batches through Janoshik and purity has ranged from 98.3% to 100.1%. Consistency is key.

For anyone new: always request the COA, and consider independent verification. The $300 for a Janoshik test is worth the peace of mind.

jim_asheville said:

Vendor quality matters when discussing certificates of analysis.

Second this. I had assumed I was the exception until I read this.

jim_asheville said:

Vendor quality matters when discussing certificates of analysis.

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.

Moderator note: the sourcing question belongs in the vendor section and has been split out. No action needed from anybody.