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FOXO4-DRI testing and certificate of analysis.
D-retro-inverso analogue of a FOXO4 fragment — 46 residues, all-D amino acids.
The short answer
FOXO4-DRI is tested by reverse-phase HPLC (UV 214 nm): chromatographic purity plus duplicate quantification in mg per vial against a qualified commercial reference standard. Identity is assessed by retention time against the same standard, with mass-spectrometry confirmation available as an add-on. €207 per vial, 48–72 h target turnaround, and every report verifiable.
What the analysis measures
Purity, quantity, identity
- Chromatographic purity (%). The main peak's share of total integrated area at UV 214 nm. It is a ratio of peptide-related peaks — not a claim about absolute mass content.
- Quantity (mg/vial). Measured content against a qualified commercial reference standard, run in duplicate; both values appear on the certificate next to the label claim.
- Identity. Retention time against the reference standard. That is presumptive identity, and the certificate says so; a mass-spectrometry match (+€79 add-on) confirms it conclusively.
The complete method — column, gradient, wavelength, limits — is published on the open method page.
Reference parameters
The molecule on paper
| Molecular weight | 5358 Da |
| Molecular formula | C228H388N86O64 |
| CAS number | 2460055-10-9 |
| Class | D-retro-inverso analogue of a FOXO4 fragment — 46 residues, all-D amino acids. |
| Also seen as | FOXO4 D-retro-inverso peptide, Proxofim |
| Tariff category | Specialty peptides |
| Reference basis | A qualified commercial reference standard |
Parameters as recorded in PubChem, rounded. Your supplier's salt form and net-peptide content will differ from free-peptide values.
Worth knowing
Before you test FOXO4-DRI
FOXO4-DRI is built entirely from D-amino acids in retro-inverso order — deliberately non-canonical chemistry. Its chromatographic behaviour differs from L-peptides of similar size, and the standard it is tested against shares that chemistry. At 46 residues it is also the longest analyte in the tariff, which the method's gradient accommodates.
Price
€207 per vial, published
FOXO4-DRI testing is €207 at the published rate — see its row in the price list. Add-ons: mass-spectrometry identity confirmation +€79 (adds 5–7 days), extended CoA data +€15, additional report +€29 (at order creation), rush +50%, additional vial of the same lot −30%.
On the certificate
What the CoA shows
- Measured quantity in duplicate, next to the label claim.
- Chromatographic purity with the full impurity table, not just the headline figure.
- The identity basis, stated: retention-time (presumptive) or mass-spectral (confirmed).
- Method reference and version, so the numbers can be interrogated.
- A task ID and QR code, so anyone can verify the report.
New to certificates? Read how to read a peptide CoA and how to verify one.
FAQ
FOXO4-DRI testing questions
How much does FOXO4-DRI testing cost?
€207 per vial at the published rate: chromatographic purity plus duplicate quantification in mg per vial, with a verifiable report. Mass-spectrometry identity confirmation is +€79, extended CoA data +€15, and an additional report +€29 at order creation.
How long does FOXO4-DRI testing take?
The target turnaround is 48–72 hours from sample receipt. A rush option at +50% moves the sample to the front of the queue; the mass-spectrometry add-on adds 5–7 days.
Same category
Also tested in Specialty peptides
Kisspeptin-10 · KPV · LL-37 · VIP · SS-31 (Elamipretide) — or see the full price list.
Iberian Analytical opens in Q1 2027 — from €99 per test, 48–72 h target, and every report verifiable. Nothing is sold on this site today. Leave an email and we will write once, when the laboratory starts issuing certificates.
Testing for a business? Apply for an associate account — a 24-month rate lock and priority scheduling.