Tenapanor Impurity 1: A Key Reference Standard for IBS-C Drug Quality Control

 

Tenapanor Impurity 1: A Key Reference Standard for IBS-C Drug Quality Control


Tenapanor is a first-in-class NHE3 (sodium/hydrogen exchanger 3) inhibitor used to treat irritable bowel syndrome with constipation (IBS-C) and, more recently, hyperphosphatemia in chronic kidney disease patients on dialysis. As a structurally complex molecule with a large, symmetric dimeric backbone, its impurity profile requires careful characterization — which is exactly where a dedicated reference standard like Tenapanor Impurity 1 comes in.

What Is Tenapanor Impurity 1?

Tenapanor Impurity 1 (CAS No. 1234366-62-1) is a process-related impurity associated with Tenapanor manufacturing. It shares the drug's core dichloro-tetrahydroisoquinoline sulfonamide structure, making it structurally close enough to Tenapanor itself to require precise analytical differentiation during quality control testing.

Key specifications:

  • CAT No: SZ-T226002
  • CAS No: 1234366-62-1
  • Molecular Formula: C45H56Cl4N6O9S2
  • Molecular Weight: 1030.9
  • Availability: Synthesis on demand

Why This Standard Matters in Drug Development

Reference standards like Tenapanor Impurity 1 are indispensable for laboratories working on Tenapanor-based generics or formulations. Specifically, they support:

  • Analytical method development and validation (AMV) — ensuring HPLC/LC-MS methods can reliably detect and separate this impurity from the parent compound
  • Quality control (QC) testing — confirming batch purity ahead of release
  • ANDA and DMF filings — providing the authentic reference material regulators expect for submission dossiers
  • Forced degradation studies — helping labs understand how Tenapanor breaks down under stress conditions
  • Unknown impurity identification — serving as a match standard when unexpected peaks appear during routine analysis

Sourcing Tenapanor Impurity 1

SynZeal's Tenapanor Impurity 1 reference standard is supplied with a detailed Certificate of Analysis (COA) and full analytical data package, and can be provided with traceability against USP or EP pharmacopeial standards where feasible. As with all SynZeal reference materials, it is intended strictly for laboratory, research, and analytical use — not for human consumption.

It's part of a broader Tenapanor-related impurity series that also includes the parent Tenapanor standard, additional numbered impurities, N-oxide variants, and nitrosamine (N-NO) related standards — useful for labs building out a complete impurity library for this drug class.

Explore More

For labs working across multiple therapeutic areas, it's worth browsing the full SynZeal product catalog, which spans thousands of pharmacopeial and non-pharmacopeial reference standards, metabolites, and stable isotope-labelled compounds across major therapeutic categories.

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