Synthetic peptides
Linear and cyclic peptides from roughly 500 Da to 30 kDa, including acylated and PEGylated analogues, as free base or salt form.
Scope of testing
What we determine, and what we do not.
A certificate means something only if the boundary around it is stated. This page is that boundary — read it before you ship, and again before you rely on a result.
In scope
Materials we accept
Lyophilized powders
The standard presentation. 1–5 mg per test package is enough for a full panel with retained material left over.
Solutions and reconstituted vials
Accepted at a declared concentration with the solvent identified. Ship cold, overnight, early in the week.
Small molecules
Research chemicals within the mass range of our chromatographic and mass spectrometric methods, where a reference standard or published spectrum exists.
Excipient blends
Formulated material where the peptide is one component. Quantitation requires the full formulation to be declared.
Retain and stability samples
Repeat testing of a previously submitted lot, reported against the original certificate so the two can be compared directly.
Reportable ranges
What each method can actually resolve
Results outside these ranges are reported as below or above the limit, never as an extrapolated number.
| Determination | Method | Reportable range | Limit of quantitation |
|---|---|---|---|
| Chromatographic purity | EPL-101 | 50.00 – 100.00 % area | 0.05 % area |
| Intact mass | EPL-102 | 500 – 30,000 Da | < 5 ppm mass error |
| Net peptide content | EPL-103 | 10.0 – 100.0 % | ± 2 % RSD |
| Water content | EPL-104 | 0.1 – 25.0 % | 0.1 % |
| Counter-ion content | EPL-104 | 0.1 – 30.0 % | 0.1 % |
| Bacterial endotoxin | EPL-201 | 0.005 – 50 EU/mL | 0.005 EU/mL |
| Microbial count | EPL-202 | 1 – 10,000 CFU/g | 1 CFU/g |
| Elemental impurities | EPL-203 | 0.01 – 100 ppm | 0.01 ppm |
| Residual solvents | EPL-204 | 5 – 5,000 ppm | 5 ppm |
Out of scope
Things we will decline, and why.
Turning work away that we cannot do properly is part of being worth trusting on the work we do take.
Clinical and diagnostic testing
We are not a CLIA-certified laboratory and do not test human or animal specimens. Blood, urine, tissue, and anything of patient origin is refused at intake.
Dosing, safety, and suitability advice
We report what is in the vial. We do not advise on whether it should be used, by whom, at what quantity, or for what purpose.
Forensic and legal casework
Our chain of custody is built for analytical traceability, not evidentiary standards. We do not accept work intended for litigation or law enforcement.
Controlled substances
We hold no DEA registration. Scheduled compounds are refused, and material identified as scheduled during analysis is reported to the client and handled under our disposal policy.
Full structure elucidation of unknowns
Mass spectrometry on an undeclared sample returns an observed mass, not a structure. De novo characterization is a separate project with its own scope and timeline.
Certifying a supplier or a brand
A certificate covers one lot of one material as received. It is not an endorsement of the seller, the product line, or any future batch.
Reading a certificate
What a result does and does not tell you
A purity figure describes the sample that reached our bench, on the day it was tested, by the method named on the certificate. It says nothing about the rest of the batch unless the batch was sampled representatively, and nothing about how the material was handled after it left us.
Purity and content are different measurements, and a high number in one does not imply the other. A powder can be 99% pure by chromatographic area and still be a third water and acetate by mass — which is exactly why the Standard package exists.
Where no specification was declared by the client, we report the figure and make no pass or fail determination. A certificate with no specification is data, not a verdict.