Capecitabine related impurities standards

  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: C45H56Cl4N6O...

 Atorvastatin is one of the most widely prescribed medicines in the world, used to lower LDL ("bad") cholesterol and triglycerides by inhibiting the liver enzyme HMG-CoA reductase. Because it's manufactured and consumed at such enormous scale — as both branded and generic product across nearly every major market — regulators hold its impurity profile to an exceptionally high standard. For pharmaceutical R&D, QC, and regulatory affairs teams, that means one thing: a dependable, well-characterized supply of impurity reference standards. Why Atorvastatin's Impurity Profile Is So Closely Watched As a statin taken daily by millions of patients, often for years or decades, even trace-level impurities in Atorvastatin batches carry real significance. Regulatory authorities such as the USFDA, EMA, and ICH require manufacturers to identify, quantify, and control: Process-related impurities generated during synthesis Degradation products formed during storage or un...

  Impurity profiling looks different depending on which drug class you're testing. A diabetes drug, a statin, and an anticoagulant each carry their own set of process-related impurities, degradation products, and pharmacopeial (USP/EP) related compounds. Having the right, well-characterized reference standard for each is what actually makes a validated analytical method possible. Here's a practical look at three real examples spanning three major therapeutic categories — and why sourcing the correct reference standard matters more than it might seem. Quick Reference: The Three Impurities at a Glance Therapeutic Area Drug Impurity CAS No. Diabetes (SGLT2 inhibitor) Dapagliflozin Hydroxy Dapagliflozin (USP) 1204222-85-4 Cardiovascular (Statin) Pravastatin EP Impurity A (6′-Epipravastatin) 81176-41-2 Anticoagulant Dabigatran Etexilate Despyridyl Ethyl Ester 1408238-36-7 Diabetes: Dapagliflozin and Its Impurity Profile Dapagliflozin is an SGLT2 inhibitor widely used in ...