Category: Sourcing and Procurement

Blind submission of a peptide for independent testing: the purchase records, submission form, custody log and how to check the report that comes back.

Choosing an independent lab to test a research peptide: independence, ISO 17025 scope, the right methods, turnaround and the report to insist on.

What a peptide batch is, what a lot number records, why results attach to batches, and how product-level and lot-level test results differ.

What a chain of custody records, why research chemical testing rarely has one, what it can and cannot prove, and how labs can log their own samples.

How vial closures affect freeze-dried peptides: nitrogen or vacuum headspace, crimp seals versus screw caps, stopper coring and glass type.

Why transit temperature excursions matter less for dry lyophilized peptides than for solutions, what mean kinetic temperature shows, and what to record.

Certificate of analysis vs certificate of conformance vs certificate of origin: how to tell them apart and what each can and cannot prove about a material.

GMP grade vs research grade peptides: what each label describes, why neither measures purity, and how to decide which one a laboratory project needs.

What ISO/IEC 17025 accreditation covers for peptide testing, why scope matters more than the logo, and how to verify a claim in three steps.

Retest date vs expiry date for research peptides: what each means, why both depend on storage history, and how to read undated paperwork.