Pepstatin A (CAS 26305-03-3)

Category Overview

Pharmaceutical Reference Standards are highly characterized compounds used to ensure the identity, purity, and potency of active pharmaceutical ingredients (APIs) and intermediates. These materials are essential for regulatory compliance, quality control, and research validation across the pharmaceutical supply chain. The category encompasses a range of purity grades, from research-grade materials to USP/EP-certified standards.

Within the broader chemical supply chain, Pharmaceutical Reference Standards like Pepstatin A bridge the gap between early-stage discovery and commercial manufacturing. They provide the analytical benchmarks required for method validation, stability testing, and batch release, directly impacting the safety and efficacy of final drug products.

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Selection Guide: How to Choose the Right Product

When selecting a Pharmaceutical Reference Standard like Pepstatin A, consider the following decision framework:

• Application requirements: For enzyme kinetic studies, a research-grade standard with ≥95% purity is typically sufficient. For GMP-compliant method validation, request a standard with full impurity profiling and residual solvent analysis.
• Regulatory compliance: If your work supports an IND or NDA filing, ensure the standard is traceable to a primary reference material. Pepstatin A is not currently a USP compendial item, but suppliers can provide characterization data aligning with ICH Q2(R1) guidelines.
• Quantity needs: Research quantities (mg to gram scale) are standard for most suppliers. For larger batches used in production-scale method validation, confirm lot-to-lot consistency data with the manufacturer.

For most analytical applications, a single batch of Pepstatin A with documented purity, water content, and storage stability will suffice. Custom synthesis is rarely required for this compound due to its commercial availability.

Quality Considerations Across the Category

Pharmaceutical Reference Standards must meet stringent quality parameters to ensure reliable analytical results. For Pepstatin A, the following are typical Certificate of Analysis (CoA) parameters:

• Purity by HPLC: ≥95% area percent, with identification by retention time match to a reference spectrum.
• Structural confirmation: Mass spectrometry (ESI-MS) and 1H-NMR to confirm molecular weight and peptide sequence.
• Water content: ≤5% by Karl Fischer titration, as Pepstatin A is hygroscopic.
• Residual solvents: Compliant with ICH Q3C guidelines for Class 2 and Class 3 solvents.

Regulatory bodies such as the FDA and EMA expect that reference standards used in pivotal studies are fully characterized and stability-indicating. Always request a CoA and, for critical applications, a stability summary under recommended storage conditions (−20°C, desiccated).

Industry Applications

Pepstatin A serves multiple industries and research domains. In the pharmaceutical sector, it is a cornerstone tool for studying protease-mediated diseases, including HIV/AIDS (HIV-1 protease inhibition), hypertension (renin inhibition), and neurodegenerative disorders (cathepsin D in Alzheimer's pathology). Recent developments highlight its relevance:

• Antithrombotic research: Aplagon recently closed a €4.8 million round to advance APAC, a first-in-class antithrombotic, into Phase II trials for arteriovenous fistula maturation failure (source: Manufacturing Chemist, June 2026). Pepstatin A is used in preclinical models to assess protease involvement in thrombo-inflammatory pathways.
• AI-driven drug discovery: Merck and Protillion launched a collaboration worth up to $510 million in milestone payments, leveraging on-chip antibody discovery platforms (source: GEN, June 2026). Reference standards like Pepstatin A are critical for validating hit compounds against known protease targets.
• Biotech instrumentation: Biotech Fluidics offers non-invasive flowmeters for real-time liquid monitoring in bioprocessing (source: Manufacturing Chemist, June 2026). Pepstatin A serves as a calibration standard for protease activity assays in continuous manufacturing setups.

Emerging applications include its use in antibody-drug conjugate (ADC) development, where cathepsin-cleavable linkers are designed to release payloads intracellularly. Pepstatin A is employed to validate linker stability and release kinetics under lysosomal conditions.

Sourcing Strategy

For organizations requiring a consolidated supply of Pharmaceutical Reference Standards products, working with a single qualified supplier can streamline procurement, reduce qualification overhead, and ensure consistent quality across the product range. Contact our team to discuss your category-level sourcing requirements and receive a quotation.

When evaluating suppliers for Pepstatin A, consider the following criteria:

• Documentation: Does the supplier provide a full CoA with HPLC chromatograms, mass spec data, and stability information?
• Lot-to-lot consistency: Request at least three batch records to assess variability in purity and impurity profiles.
• Supply chain transparency: Confirm the origin of the raw peptide and whether it is synthesized under ISO 9001 or GMP-compliant facilities.
• Lead times: Standard lead times for Pepstatin A range from 1–2 weeks for in-stock items to 4–6 weeks for custom synthesis.

Supplier Selection Guide

Research quantities of Pepstatin A (CAS 26305-03-3) are available from major suppliers. For bulk production, formal quotations with CoA, SDS, and lead time are available within 24 hours — contact our team to inquire about current pricing and discuss your requirements.