This follows the opening post rather than contradicting it.
Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover experiments: add a known amount of impurity to a sample and measure whether you recover the added amount.
Coming back to post #61, because the follow-up matters more than the original answer.
Transfer between laboratories: a method can be transferred from one lab to another, but the receiving lab needs to demonstrate that they can achieve the same performance. This requires comparative testing and sometimes small method refinements.
Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to generate degradation products and demonstrate that the method can separate them from the parent peak. Acceptance is that the method is stability-indicating.
This follows post #72 rather than contradicting it.
For anyone arriving from a search: the marked solution above is the direct answer, and the replies underneath it add the caveats that make it safe to use.
I read post #124 twice before replying, because I had assumed the opposite.
Robustness: the method gives consistent results when minor parameters vary. Tested by deliberately varying pH, temperature, flow rate, and mobile phase composition within reasonable ranges and demonstrating that results stay within acceptance.
Picking up post #131: that is the part I would want checked first.
Accuracy: the method measures what you intend to measure. For purity methods, this is tested by spike-and-recover experiments: add a known amount of impurity to a sample and measure whether you recover the added amount.
Read the full topic (149 posts)
| Topic | Participants | Replies | Views | Activity |
|---|---|---|---|---|
|
About the Method validation category
Specificity, linearity, precision, accuracy, robustness, system suitability, and why two labs disagree. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is…
|
+1 | 5 | 468 | 5mo |
|
What a stability-indicating method is and how you demonstrate one
Asking directly, because I could not find a straight answer: What a stability-indicating method is and how you demonstrate one Working through the identity arithmetic and I would like it checked. retatrutide…
|
4 | 57k | 6mo | |
|
An inter-laboratory comparison on one lot, tabulated
On the subject in the title: An inter-laboratory comparison on one lot, tabulated Working notes rather than a conclusion. Working through the identity arithmetic and I would like it checked. semaglutide has a…
|
3 | 17k | 10mo | |
|
Why one laboratory's 98.4% and another's 96.1% may not contradict
Why one laboratory's 98.4% and another's 96.1% may not contradict I have a specific reason for asking rather than idle curiosity, and the context is below. A documentation question rather than an analytical…
|
+28 | 37 | 457 | 7mo |
|
An inter-laboratory comparison on one lot, tabulated — what changed since
An inter-laboratory comparison on one lot, tabulated — what changed since — setting out what I have, and where I think it stops being reliable. I would like to understand what this number means before I…
|
+24 | 28 | 3.3k | 7mo |
| Topic | Participants | Replies | Views | Activity |
|---|---|---|---|---|
|
Theoretical plates: useful number or ritual?
Theoretical plates: useful number or ritual? I have a specific reason for asking rather than idle curiosity, and the context is below. I would like to understand what this number means before I repeat it…
|
2 | 284 | 9mo | |
|
System suitability injections: if they failed, the run did not happen — the long version
System suitability injections: if they failed, the run did not happen — the long version — setting out what I have, and where I think it stops being reliable. A documentation question rather than an…
|
+2 | 6 | 6.2k | 1d |
|
About the Home & field testing category
What consumer-accessible tests can and cannot tell you. Mostly a subcategory about limitations. This post is a community wiki: any member at trust level 3 or above can edit it, and every edit is recorded with…
|
4 | 51k | 11mo | |
|
Second pass at: Robustness: the parameters worth deliberately varying
On the subject in the title: Second pass at: Robustness: the parameters worth deliberately varying Working notes rather than a conclusion. I would like to understand what this number means before I repeat it…
|
+61 | 66 | 9.5k | 3mo |
|
Robustness: the parameters worth deliberately varying
Robustness: the parameters worth deliberately varying Writing it up because I had to work it out twice and would rather nobody else did. A documentation question rather than an analytical one. I have a…
|
+53 | 57 | 664 | 8mo |