Industry notes
Short notes on the things that change how a reference standard is chosen or defended: compendial naming, nitrosamine and genotoxic impurity control, isotope-labelled internal standards and pharmacopoeial revisions. Written by CATO, sourced where a source exists, and kept short enough to read at the bench.
| Regulatory NMPA adds a supplementary test method for tacrolimus and pimefrolimus in cosmetics A national regulator has published a supplementary method for two immunosuppressants that are illegally added to cosmetics. What it changes for laboratories — and which reference standards the method needs. | 2026-10-08 |
| Compendial naming EP Impurity B is not USP Related Compound B: the letters do not always match Two pharmacopoeias can number the same impurity differently. Here is a worked example with CAS-level evidence, and the three checks that stop a wrong standard reaching your method. | 2026-10-07 |
| Impurity control Nitrosamine impurities: what a laboratory actually needs on file Nitrosamine control is a documentation problem as much as an analytical one. A short checklist of what to hold for each nitrosamine standard, and the questions that decide whether a lot is usable. | 2026-10-06 |