What a batch number is supposed to mean
A document is only as good as the chain that connects it to the material, and most chains here are two or three links longer than the paperwork admits.
API sourcing
Page 9 of 23 of this archive, newest first.
A document, not a test: what a certificate actually is
Nothing on this page is difficult. It is simply unfamiliar, and unfamiliarity is what makes a weak certificate look like a strong one.
A named analyst is the cheapest quality signal in this trade
Two signatures — one who performed the work, one who approved its release — are the ordinary regulated convention and are almost unknown here.
The certificate says 2025. The vial in your hand does not say anything.
The interval between manufacture and analysis is the most under-read figure on the page, and the one most likely to matter by the time a vial is opened.
ERP names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What a 20% rise in coupling-reagent prices does to a 20 mg vial
Follow the resin, not the catalogue.
What changed at GL Biochem in July, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
WWB names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What a 12% rise in coupling-reagent prices does to a 15 mg vial
Follow the resin, not the catalogue.
What changed at SSA in July, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Suzhou export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Xianning export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
What changed at QST in July, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
Hong Kong export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
Zhuhai export categories for peptide intermediates were quietly renamed
Follow the resin, not the catalogue.
What a 32% rise in coupling-reagent prices does to a 20 mg vial
Follow the resin, not the catalogue.
The certificate of analysis, line by line
The header identifies the batch, the table records the tests, and the footer says who is answerable. Two of the three are usually incomplete.
What changed at SWB in June, and what the company says prompted it
Documentation practice is the only part of vendor quality a buyer can assess before purchase.
What a 22% rise in coupling-reagent prices does to a 10 mg vial
Follow the resin, not the catalogue.
QSC names the synthesis and fill sites behind its catalogue
Documentation practice is the only part of vendor quality a buyer can assess before purchase.