Net peptide content
The proportion of the material that is peptide, excluding counter-ions and residual moisture. Distinct from gross weight — a quantity quoted by gross weight and one quoted by net peptide content are not the same order.
Sourcing reference
Terms that come up during sourcing.
Short definitions of the terms that appear in quotations, specifications and documentation. General industry usage — the values that apply to a specific order are the ones in your quotation and specification sheet.
Specification and quantity
Most sourcing misunderstandings trace back to one of these.
Purity by HPLC
The proportion of peptide-related material represented by the target peak, measured under a stated method. The method and wavelength matter; a purity figure without them is not comparable between suppliers.
Counter-ion
Peptides are commonly supplied as a salt. Which salt form is supplied affects the net peptide content and, for some applications, the suitability of the material.
Lyophilized powder
Freeze-dried solid, the usual supply form for peptides. Storage and reconstitution conditions are product-specific and stated with the documentation.
Modification
Changes such as terminal capping, labelling, cyclization or conjugation. These affect feasibility, lead time and price, so they belong in the inquiry rather than being raised after quotation.
Specification
The written acceptance criteria a batch is tested against. Agreed before production. Anything not in the specification is not something the batch is tested for.
Documentation and commercial
Terms that appear in quotations, confirmations and shipping paperwork.
COA
Certificate of Analysis. Batch-specific results against the agreed specification. See the documents page for the full record set.
Order confirmation
The written restatement of the agreed order. It is the reference point for what should arrive and for what the documents should say.
Incoterms
The standard rules naming who is responsible for transport, risk and formalities at each stage. The applicable rule is named per order, not fixed site-wide.
Lead time
The interval from order confirmation to dispatch. Depends on product, quantity and whether the work is catalog supply or a custom project.
MOQ
Minimum order quantity. Depends on product form and packing, and is confirmed during technical review.
Custom synthesis
Sequence-based project work rather than supply from an existing catalog item. Scoped from the sequence, quantity, modification and analytical requirements.