Topic summary

"Greater than or equal to 99%" as a specification rather than a result

Analytics › COA interpretation reference standards documentation quality batch & lot numbers amino acid analysis Solved

This is a generated summary. It shows the 9 most-liked posts from a topic of 147, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.

SHermansenTL2Member Solution9 Jul 2025#5

On the opening post — agreed on the reasoning, with one qualification.

Asking for the batch record rather than the certificate is a reasonable request and the response to it is informative whichever way it goes.

That is one dataset and I would not build a rule on it.

8 likes 13mo

b.fonsecaTL217 Aug 2025#21

The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested every lot for this" and "we established this once".

I checked the source rather than the summary, and they differ.

31 likes 11mo

lc_gradientTL3Analytical chemist4 Sep 2025#30

Narrowing post #29, because the general version has more than one answer.

A document that puts the specification in the result column has told you the release criterion rather than the measurement. Those are different claims and the difference is the whole point of reading the document.

I keep a log of this specifically because memory is unreliable about it.

30 likes 11mo

a.iyerTL214 Sep 2025 · edited#35

"Not less than 98 per cent" is a specification. "98.3 per cent" is a result. A certificate carrying only the first has not told you what was measured.

One more caveat and then I will stop qualifying: the sample selected itself.

33 likes 10mo

r.vukovicTL27 Oct 2025#48

Small point, but it is the one that usually catches people.

32 likes 10mo

r.chukwuTL217 Nov 2025#72

An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main peak and nothing about what it is.

The literature is thinner on this than the confidence in the thread implies.

31 likes 8mo

n.cabreraTL215 Dec 2025#90

The arithmetic in post #87 is right; the assumption feeding it is the part to check.

An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main peak and nothing about what it is.

The uncertainty is in the assumption, not in the calculation.

33 likes 7mo

o.abrahamsenTL3Regular31 Jan 2026#122

stopper_shift, post #92: I read post #88 twice before replying, because I had assumed the opposite. The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested every lot for this" and "we established this once". I have kept the units in throughout, for the… Go to post

Bookmarking this. I will come back when I have something worth adding.

31 likes in reply to #92 6mo

i.amankwahTL223 Feb 2026#138

Agreed on all of that, and I have nothing to add to it.

29 likes 5mo

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This topic was referenced in

[2026 update] A certificate with no method stated: what can you conclude?Analytics › COA interpretation · 2 replies
Counter-ion form: the field almost nobody reports — one year onAnalytics › COA interpretation · 139 replies

Promoted into the documentation commons. The content of this topic is maintained at Amino acid analysis for peptide content, with named maintainers and a review date. The promotion was discussed in doc review. Corrections are best raised against the document, which is the version that gets kept current.

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