Last reviewed: October 2026 · Cleared Peptides research team
PQQ disodium is the disodium salt of pyrroloquinoline quinone, also called methoxatin. The salt CAS number used here is 122628-50-6. The free quinone is a different registry entry, CAS 72909-34-3. PQQ is a redox cofactor of bacterial dehydrogenases. That is a biochemical role of the cofactor, not a statement about a person.
| Name | PQQ disodium |
|---|---|
| Other names | Pyrroloquinoline quinone disodium; methoxatin disodium |
| CAS number | 122628-50-6 for the disodium salt |
| Free quinone | CAS 72909-34-3. Do not mix the two registry numbers. |
| Class | Quinone cofactor salt. Not a peptide. |
| Catalog status | Not a current Cleared Peptides lot. |
Cofactor note
In bacteria, PQQ-dependent dehydrogenases use the quinone as an enzyme cofactor. The disodium salt is the solid form commonly named on research catalogs. Solubility of a specific lot stays on that lot’s COA.
Frequently Asked Questions
Is the disodium salt the same CAS as PQQ?
No. This page uses 122628-50-6 for the disodium salt and 72909-34-3 for the free quinone.
Is PQQ a peptide?
No.
Is this for human use?
No. Laboratory reference only.
Selected References
Registry records and peer-reviewed literature listed as scientific background. Citation does not imply endorsement, a benefit, or any use.
- Public records: methoxatin disodium CAS 122628-50-6, and pyrroloquinoline quinone CAS 72909-34-3. Cited to keep the salt and the free quinone distinct.
Research Use Only Notice
This guide is provided for educational and laboratory reference purposes. It summarizes published structural and biochemical literature. It does not describe, recommend, or imply any use in humans or animals. These materials are not drugs, foods, cosmetics, or dietary supplements on this page, are not offered here as a treatment, and no dosing or administration instructions are provided. Cleared Peptides does not currently list a lot for every compound on this page.
