Why researchers choose Peptidology
From a 14-point analytical release program to same-day shipping and a responsive US team, every part of Peptidology is built to give researchers documented, reproducible materials they can trust — lot to lot.
Purity is the baseline. Our release standards are the difference.
Purity and content tell you what’s in the vial. They don’t tell you whether a lot is clean enough, stable enough, and consistent enough to trust across an experiment — that’s what a real release program is for, and we run ours across our entire lyophilized catalog.
Chromatographic purity
HPLC-UV/VIS
Resolves the target peptide from process-related impurities and confirms it’s the dominant species in the vial.
Net peptide content (assay)
HPLC-UV/VIS
Measures the actual mass of each active against label claim—so your working concentration is what you think it is.
Bacterial endotoxins
LAL
Quantifies endotoxin load, a common source of background signal in immune- and cell-based assays.
Sterility — compendial
USP <71>
The compendial gold-standard sterility test, performed under accreditation.
Sterility — rapid, 2nd lab
ScanRDI
An orthogonal rapid method run at an independent laboratory—a second method and a second set of eyes.
Arsenic
ICP-MS
Trace elemental impurity screen; metals drive cytotoxicity and can interfere with enzymatic readouts.
Cadmium
ICP-MS
Quantified to a part-per-million limit of quantitation and reported per lot.
Chromium
ICP-MS
Part of a five-element panel covering the metals most relevant to assay interference.
Lead
ICP-MS
Screened at trace level; lead is a classic confound in sensitive biological systems.
Mercury
ICP-MS
Rounds out elemental impurity coverage with a low limit of quantitation.
Residual solvents
GC-MS Panel
Full solvent panel (acetone, benzene, methanol, toluene and more) to catch synthesis and purification carryover.
Container-closure integrity
Dye Ingress
Confirms the seal holds—so the sterile, dry environment inside the vial stays that way in storage and transit.
Solubility confirmation
Reconstitution
Verifies the lyophilized cake goes fully into solution, so reconstitution doesn’t introduce concentration error.
Residual trifluoroacetic acid
Ion Chromatography
Quantifies leftover TFA from synthesis—a frequently ignored variable we measure and report. Why it matters ↓
Sterility, confirmed twice—and confirmed faster.
USP <71> and ScanRDI, in parallel
Every lot is confirmed sterile by USP <71>, the compendial standard, and in parallel by ScanRDI rapid detection at an independent laboratory. ScanRDI returns viable-organism results in a fraction of the <71> incubation window—so we can confirm sterility and move qualified lots toward release faster, without trading away the orthogonal confirmation that a second method and a second lab provide.
Why run both? The compendial test is the recognized reference and isn’t going anywhere—but its long incubation window is also a bottleneck between a finished lot and a researcher who needs material.
Rapid detection lets us read sterility early and keep lead times short, while the compendial method delivers the independent, recognized confirmation. You get faster availability and two independent reads on the one attribute where contamination quietly ruins everything downstream.
It’s the difference between waiting on one slow answer and having two answers that agree.
A note on TFA.
Most research peptides are built by solid-phase synthesis, where trifluoroacetic acid (TFA) handles the final cleavage of the peptide from the resin and strips away the side-chain protecting groups. It does the job well—but it tends to linger afterward as a counterion bound to the finished peptide, and it’s a routine residue of the reverse-phase purification step too.
Left unmeasured, residual TFA can be cytotoxic to cultured cells, shift the pH and solubility of a reconstituted solution, and quietly distort how much of your weighed mass is actually peptide versus salt. Two lots that look identical by purity can still behave differently at the bench if their TFA load differs.
So we quantify it by ion chromatography on every lot and report the result. It’s a small line on the Certificate of Analysis and an easy one to omit—which is exactly why we don’t. Measured, not assumed.
A spec failure upstream becomes a confound downstream.
Each test exists because an out-of-spec result has a specific, predictable consequence for in-vitro work. We measure and report these factors rather than asking you to assume them.
Third-party testing, under accreditation.
We don’t grade our own homework. Testing is performed by independent laboratories operating to recognized standards.
ISO/IEC 17025:2017
Analytical testing is performed at a laboratory accredited to the international standard for testing competence, with accreditation traceable to a published certificate.
Two laboratories
Sterility is confirmed by two independent labs using two methods—compendial USP <71> and rapid ScanRDI detection.
Up to 23 vials / batch
We test up to 23 vials per batch across purity, net peptide content, identity, endotoxins, sterility and more—not a single token vial.
Built for how research teams actually buy.
Rigorous testing is the foundation. Everything around it is designed to be just as dependable.
cGMP-aligned manufacturing
Finished product is made by contract manufacturers operating cGMP-aligned quality systems, for consistent and well-controlled production.
Fast US shipping
Orders placed by 3 PM Mountain Time ship the same day, Monday through Friday — with free 2-day shipping on orders over $250, delivered anywhere in the United States.
Flexible payment
Pay by credit card or ACH bank transfer — whatever fits how your organization buys.
Responsive support
Call or text 480-974-4660, email [email protected], or use website chat — our US-based team is ready to help.
Every lot. Its own COA.
Each lot ships with a transparent, lot-specific Certificate of Analysis showing reported results and traceability for every attribute—purity, net peptide content, endotoxin, elemental impurities, residual solvents, double-lab-verified sterility, and residual TFA. No vague claims. Just numbers you can compare, lot to lot.
Industry discounts
Verified Defense & Veteran Affairs, Federal & Municipal government, and Public Safety & Emergency Response organizations receive dedicated pricing — supporting these professions and their access to high-quality research materials.
Talk to a real, US-based team.
Peptidology
11111 N Scottsdale Road, Suite 205
Scottsdale, AZ 85254
DUNS: 11-940-8903
Our Scottsdale operations center isn’t open to visitors at this time. For the fastest response, reach us by phone, email, or chat.