{"id":11184,"date":"2026-10-17T19:23:35","date_gmt":"2026-10-17T17:23:35","guid":{"rendered":"https:\/\/nexxusbio.com\/?p=11184"},"modified":"2026-10-17T19:26:30","modified_gmt":"2026-10-17T17:26:30","slug":"evaluation-of-lc-ms-documentation","status":"publish","type":"post","link":"https:\/\/nexxusbio.com\/en\/hodnotenie-lc-ms-dokumentacie\/","title":{"rendered":"Evaluation of LC-MS documentation without abbreviations"},"content":{"rendered":"

Laboratory material may have declared high purity, accurate name and batch number. However, without the possibility of verifying these data in the analytical records, it remains only a declaration. Evaluation of LC-MS documentation<\/strong> it helps assess whether the submitted data adequately support the identity of the material, the nature of the observed impurities, and the traceability of the specific batch.<\/p>\n

LC-MS combines liquid chromatography with mass spectrometry. In the context of research-grade materials, it is not one universal proof of quality, but a set of interrelated data. The value of the documentation depends on whether it is clearly assigned to the product and batch, whether it describes the measurement conditions, and whether the interpretation corresponds to what the data themselves really show.<\/p>\n

What the LC-MS documentation has to confirm<\/h2>\n

For materials with a defined molecular structure, LC-MS primarily answers the question of whether the signal corresponds to the expected molecular weight. In the case of peptides, a multiple-charged ion is often observed, therefore only one peak with a value corresponding to the entire neutral molecule may not appear on the spectrum. It is important that the documentation indicates which ion was evaluated and which theoretical value is compared with the measured value.<\/p>\n

Liquid chromatography also separates the components of the sample over time. The chromatogram therefore provides an insight into the relative homogeneity of the signal under the chosen analytical conditions. A pronounced main peak can support the claim of the predominance of one component, but by itself it does not demonstrate complete structural characterization or the absence of all possible impurities.<\/p>\n

A well-prepared record links these two layers: it shows the retention time of the analyzed peak and the mass spectrum that relates to that peak. Without this link, the chromatogram and the spectrum may be correct, but it is not clear whether they describe the same chromatographic fraction.<\/p>\n

Evaluation of LC-MS documentation step by step<\/h2>\n

The first step is administrative compliance. The material name, batch number, form and date of analysis should be identifiable directly in the COA<\/a> or in the attached analytical record. If only the general name is given on the document without the batch number, its contribution to traceability is limited. Likewise, it is necessary to distinguish between the date of manufacture, the date of testing, and the date of issuance of the document.<\/p>\n

The following is a comparison of the declared and measured weight. The document should clearly state the theoretical molecular weight, the observed m\/z value, the charge state, and the type of adduct if relevant. In the case of peptides, protonated forms or sodium adducts are commonly observed, for example. A deviation without explanation may not automatically mean incorrect identity, but requires careful interpretation.<\/p>\n

The third level is the chromatographic record. Evaluate whether the time axis is labeled, whether the intensity or absorbance is available, and whether the main peak is visible along with any secondary peaks. The goal is not to have the chromatogram appear visually perfectly smooth. What is more important is that the document clearly demonstrates the quality of the separation and that the declared purity is based on a clearly labeled analytical result.<\/p>\n

Finally, the consistency between the LC-MS and the other data in the COA must be verified. If the COA states the purity determined by HPLC<\/a>, LC-MS usually supports the identity of the main component, while the percent purity is the result of chromatographic evaluation. These methods complement each other, but they cannot be confused. The designation \u201eLC-MS verified\u201c is not automatically synonymous with quantitatively determined purity.<\/p>\n

Data that increases the evidentiary value<\/h3>\n

The most convincing document may not be the longest one, but it must allow for independent reading of the result. The following data are particularly useful:<\/p>\n