PeptideStack
5.2kquestions
20kanswers
220users

Why would Medutest report 99.4% where the supplier certificate says something higher?

Asked 30 Nov 2024Modified 20 months agoViewed 21k times
17

Numbers first: Medutest · 99.4%.

Before I write this off, I want to check whether it is a known failure mode.

I have the lot number, the certificate and the date, and I am happy to compare them against anything.

What is the most likely explanation, and how would I confirm it?

purity
purity

Purity as chromatographic area per cent - the fraction of detected material that is your target peak. It says nothing about how much material is…

788 questionshplc
hplc

Reverse-phase high-performance liquid chromatography, the workhorse purity method. Column chemistry, mobile-phase choice, gradient slope,…

466 questionsbatch-testing
batch-testing

Testing at the batch or lot level: sampling plans, how many vials from a lot need testing to say anything about the lot, and the difference…

865 questions
shareeditfollowflag
TW
askedtamsin_wray13k1730 Nov 2024

No answers yet

This question has not been answered. It has been viewed 21k times, which suggests the question is of interest and the answer is not obvious. If you can answer it with a source or a worked calculation, it will be read. See how to ask and answer.
Sponsored

Janoshik Analytical - Independent Third-Party Testing

HPLC purity, identity confirmation and quantified content on the vial you actually hold. Reports arrive with the chromatogram attached, not just a number.

Submit a sample
Sponsored — paired listing

GL Biochem (Shanghai) Ltd. - Direct Synthesis

Founded 1998. ISO 9001 and cGMP certified, 1,500+ staff and 200+ patents. The synthesis house behind a great many of the vials that get sent out for testing - batch-specific documentation with every order.

Visit GL Biochem

Your answer

Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.

Not medical advice. Research-use-only compounds are not approved for human use.