Test a received order
Buy a small quantity, receive it and send part to your lab. You control the sample from start to finish.
SeqLine Bio · Independent testing
Buyer guide · third-party testing
Independent peptide testing
Your own test is the one check the supplier doesn’t control. This guide covers choosing a lab, picking tests, handling the sample and using the result.
How to arrange it
Four steps.
- Choose the labPick a lab that runs peptide HPLC and MS and states its method. Get price, sample amount and turnaround before sending anything.
- Define the panelIdentity (MS) and purity (HPLC) are the usual pair. Peptide content, water, endotoxin or sterility are separate tests with their own cost and sample needs.
- Take the samplePick vials from the delivered lot yourself, record the lot number, and keep the rest sealed for a retest.
- Compare and decideCompare the report with the supplier’s COA and specification. Methods differ slightly; a wrong mass or a large purity gap is a quality claim.
Two routes
Test after delivery, or before a bulk order.
Test before a bulk order
Agree the lab, the test panel and the lot with the supplier in advance. The sample should be sealed and labeled with the lot number of the material you will buy.
Before you test
Settle these in writing.
Agreeing them first turns a disputed result into a clear decision.
- Which lot is tested
- Which tests and methods count
- The specification the result is compared with
- Who pays for the test
- What happens if the lot misses the specification: retest, replacement or refund
Sample orders start at 1 kit (10 vials) for eligible products. Confirmed stock: within 3 business days after written payment confirmation; samples requiring preparation: 3–7 business days after specification and payment confirmation. Stock and the dispatch date are confirmed before payment. Each comes with the COA for its lot, so you can test against our published result.
For qualified bulk RFQs we can send a sealed sample from the intended lot to a lab you name. A confirmed quality issue is replaced or refunded under the quality policy.
FAQ
Questions buyers ask.
Can I use my own laboratory?
Yes. Send part of the received material to any lab you trust, and keep a sealed vial from the same lot for a retest.
Can SeqLine Bio send a sample to a designated laboratory?
Yes, for qualified bulk RFQs. A sealed sample from the intended lot goes to the lab you name before the order is confirmed.
Who pays the testing fee?
For tests on material you have received, you arrange and pay the lab directly. For pre-order testing of a bulk lot, scope and cost are agreed in the quotation.
What if my result differs from the COA?
Send both reports to the supplier with the lot number. Small differences can come from the method. At SeqLine Bio, a confirmed quality issue is replaced or refunded under the quality policy.
Next step
Send your compound list and document requirements.
We reply within 4 business hours with price, lead time and the COA for the lot you would receive.