Quick answer
Define the target, scale, purity, analytical plan, presentation and documentation expectations before production. Then evaluate the resulting batch against those agreed requirements.
From sequence to specification
The first step is a clear technical brief covering sequence, quantity, purity target and analytical requirements.
Synthesis is one stage of the workflow
Peptide assembly is followed by downstream processing that may include purification, lyophilisation and analytical assessment.
Purity and identity are different questions
Where HPLC and LC–MS are specified, each method contributes different information to project review.
Documentation should match the project
Ask how batch information is organised and which documents are available for the material under review.
Packaging and logistics belong in the brief
Presentation and destination requirements are easier to handle when they are defined early.