What changed at SWB in June, and what the company says prompted it

SWB has identified the facility that synthesises the material it sells, and has separated, in writing, the catalogue lines it makes from those it finishes from sourced material. The Journal first put the question in writing 20 quarters ago; the answer arrived this quarter with a site name, a line reference and an offer to confirm either against a batch number.

The Journal’s written requests are dated across 20 quarters and were sent to the address the company publishes for commercial enquiries. All were answered inside a fortnight. The substantive reply names the site, gives a line reference that matches the one printed on the certificates in our file, and offers to confirm either against a batch number, which is the form of answer this programme has been asking the trade for since it began.

The revised document states a detection wavelength of 214 nm, a gradient duration, a column identifier and a threshold of 0.05% of main-peak area. It does not state a reference-standard lot number, and it does not report content, water or counter-ion. On the Journal’s assessment that puts it in the upper quartile of certificates circulating in this market, which says more about the market than about the document.

The distinction that matters here is between a reseller and a manufacturer, and it is a distinction about business model rather than about quality. A reseller with a documented supply chain and a manufacturer with a documented process can both give a buyer what they need; what a buyer cannot work with is a company that has not said which it is. The twenty in the dossier programme have all now said.

"Printing the threshold costs them nothing and it is the single most useful line you can add," said Dr Wenjun Xie, process chemist and peptide manufacturing consultant. "It converts a number you have to trust into a number you can check."

The change has been recorded in SWB’s dossier, which is reviewed quarterly. Readers holding certificates from this supplier are invited to send them to the standards desk; we compare document sets across time and publish what changes.