Reference library covering research compound chemistry, analytical methods, and storage best practices.
Dry ice is not an inert cold source. It fills a shipper with carbon dioxide, and a sample thawed from that atmosphere can reach a pH it was never formulated at.
A Drug Master File is a confidential FDA submission that means something only inside a referencing drug application — not a quality grade a listing can claim.
A proline-containing peptide can elute as two peaks of identical mass with no impurity present. What causes conformational doubling, and how to identify it.
A purity figure is only as good as the instrument that made it. What resolution, tailing, and injection-repeatability checks establish — and what they cannot.
Stepwise chain assembly degrades with length. Chemoselective ligation joins purified fragments instead — and leaves a different impurity record behind.
A 0.22 µm filter is rated by pore size, but for peptides the membrane polymer matters more: what binds, what leaches, and how much never reaches the vial.