Purity HPLC
Liquid chromatography separates your sample into its components so we can report how much of it is the target compound, given as a percentage.
Independent third-party testing · San Diego, California
Testing for researchers and institutions
We are committed to performing testing on various products, keeping manufacturers honest and protecting our community.
Testing services
Services Provided
Build the test panel your sample needs. Select any combination of analyses for each sample you send. Start with the core checks, then add screening where it matters for your research.
Core analysis
Identity LC-MS
Mass spectrometry measures the molecular weight of the compound and checks it against the expected value, so you know the vial holds what the label claims.
Net Content
Quantifies the actual amount of peptide in the vial, so you can compare the measured mass against the amount stated on the label.
Endotoxins
Detects bacterial endotoxins, residues left by gram-negative bacteria that can interfere with research results even when a sample looks clean.
Sterility PCR
Polymerase chain reaction looks for microbial genetic material, flagging bacterial or fungal contamination that other tests can miss.
Conformity
We test extra vials from the same lot and compare them, so you can see whether the whole batch matches rather than a single vial.
Heavy Metals
Screens for toxic elemental contaminants such as lead, cadmium, arsenic and mercury that can enter during synthesis or handling.
Additional screening
Fentanyl Screen
A targeted check for fentanyl in your sample, giving you a safety screen for one of the most dangerous possible contaminants.
pH Analysis On request
Reports how acidic or alkaline your sample is, useful when checking stability or comparing preparations.
All services are provided for research use only.
Pricing
Clear, upfront pricing
Every analysis has a fixed price per sample. Start with Purity & Identity and add only what you need.
Most requested
Request this test
Purity & Identity
$320USD
- HPLC purity, reported as a percentage
- LC-MS identity by molecular mass
- Digital Certificate of Analysis
Add Net Content
Measured peptide amount in the vial
+$70
Measured peptide amount in the vial
Endotoxins1
Bacterial endotoxin screen
Sterility (PCR)1
Microbial contamination screen
Heavy Metals
Elemental contaminant screen
Conformity
Extra vials from the same lot
Fentanyl Screen
Targeted contamination check
pH Analysis
Available on request
1 Requires a separate sealed vial so the sample is not exposed before testing.
All prices are per sample in US dollars (USD), before applicable taxes.
Why Ridgewell
Independent results you can rely on
Ridgewell Diagnostics is an independent testing service built for researchers who want to verify their materials before they use them. We are not tied to any vendor, so our reports describe the sample and nothing else.
Vendor neutral
We do not sell compounds or endorse suppliers. The result is the result.
Upfront pricing
Prices are published per analysis, in US dollars, before you send anything.
Clear, readable reports
Every COA states the methods used and what each result means, in plain language.
Confidential by default
Your results belong to you. We never publish a report without your permission.
Testing for the research community
We combine established analytical chemistry with straightforward service: one point of contact, honest turnaround estimates and results you can check against the label.
San Diego, California
FAQ
Questions before you send a sample
Which tests should I choose?
Most clients start with Purity & Identity, which confirms the compound and how pure it is. Add Net Content to check the amount in the vial, and add Endotoxins, Sterility, Heavy Metals or the Fentanyl Screen when contamination is a concern. Contact us if you would like a recommendation.
How much sample do I need to send?
For most analyses one unopened vial is enough. Endotoxin and sterility testing each need their own sealed vial, and Conformity testing needs one extra vial per comparison. We confirm the exact requirements with your quote.
How long does testing take?
Turnaround depends on the analyses you select and is confirmed with your quote. The clock starts once your sample has arrived and been accepted at our lab.
How will I receive my results?
Your Certificate of Analysis is sent by email as a digital report. It lists the sample details, the methods used and each result.
Are my results kept private?
Yes. Reports are shared only with the person who placed the order unless you ask us to share or publish them.
What currency are prices in?
All prices are in US dollars (USD), per sample, before applicable taxes.
Ready to test a sample?
Tell us what you are sending and we will reply with a confirmed quote.
Contact
Request a quote or ask a question
Send us the details of your sample and the analyses you are interested in. We aim to reply within one business day.
Location
San Diego, California