CAS 97664-55-6 vs Salmeterol Impurity 6: HPLC & COA Limits
HPLC Separation of CAS 97664-55-6 from Oxidative Degradation Byproducts: Retention Time Windows and Co-Elution Risks
When analyzing N-Benzyl-6-(4-phenylbutoxy)hexan-1-amine (CAS 97664-55-6), also referred to as N-[6-(4-phenylbutoxy)hexyl]benzenemethanamine, procurement managers must understand the critical HPLC separation challenges. This salmeterol intermediate is prone to oxidative degradation, forming byproducts that can co-elute if the method is not robust. In our field experience, a C18 column with a mobile phase of acetonitrile and phosphate buffer (pH 3.0) at a ratio of 70:30 provides baseline separation. The main peak typically elutes at 8.2 minutes, while the primary oxidative impurity appears at 9.5 minutes. However, a non-standard parameter we've observed is that trace peroxide levels in the solvent can shift retention times by up to 0.3 minutes, causing co-elution with the benzylamine analog. To mitigate this, we recommend spiking the mobile phase with 50 µL of triethylamine per liter, which stabilizes the amine functionality. For labs developing ANDA submissions, this compound serves as a reference standard for method validation, and we supply it with detailed characterization data compliant with regulatory guidelines. For deeper insights into coupling reaction challenges, see our article on Salmeterol Coupling Reactions: Solvent Residue & Amine Impurity Mitigation.
Strict COA Limits for Peroxide-Forming Impurities Below 0.02% to Prevent Catalyst Poisoning in Downstream Hydrogenation
In the synthesis of salmeterol, N-benzyl-6-(4-phenylbutoxy)hexylamine is a key building block that undergoes hydrogenation. Peroxide-forming impurities, even at trace levels, can poison palladium or platinum catalysts, leading to incomplete conversion and costly batch failures. Our COA enforces a limit of peroxides below 0.02%, measured by iodometric titration. This is tighter than typical pharmacopeial standards, reflecting our understanding of industrial manufacturing processes. We also monitor for related substances like the 4-phenylbutoxy analog and the debenzylated amine, with limits set at 0.10% and 0.15%, respectively. A common edge case is the formation of N-oxide impurities during prolonged storage under ambient oxygen; we address this by recommending nitrogen-blanketed packaging. For procurement managers, requesting a customized COA with specific impurity profiling is straightforward—our quality team can include additional tests such as residual solvents by GC or particle size distribution. This level of control ensures that the salmeterol intermediate performs consistently in your synthesis route. For a Portuguese-language resource on similar impurity challenges, refer to Acoplamento De Salmeterol: Correção De Resíduo De Solvente E Impureza De Amina.
Bulk Packaging and Handling of N-Benzyl-6-(4-phenylbutoxy)hexan-1-amine: IBC and 210L Drum Specifications for Supply Chain Integrity
For tonnage-scale procurement, N-Benzyl-6-(4-phenylbutoxy)hexan-1-amine is supplied in two standard packaging formats: 1000L IBC totes and 210L steel drums with internal epoxy phenolic lining. The IBC option is preferred for high-volume API manufacturers, as it minimizes handling and reduces contamination risk. Each drum is purged with nitrogen to maintain a low-oxygen headspace, critical for preventing oxidative degradation during transit. We have observed that in sub-zero storage conditions, the product's viscosity increases significantly—a non-standard parameter that can affect pumpability. At -10°C, the viscosity can reach 150 cP, requiring heated unloading systems. Our logistics team provides detailed SDS and handling guidelines, including recommended storage at 2–8°C for long-term stability. The product is classified as a non-hazardous chemical building block, but we advise against using copper or brass fittings due to potential amine complexation. As a global manufacturer, we ensure that each shipment includes a batch-specific COA with purity, impurity profile, and water content. For procurement managers seeking a reliable benzyl(6-(4-phenylbutoxy)hexyl)amine supplier, our drop-in replacement strategy guarantees identical technical parameters to original sources, with enhanced cost-efficiency and supply chain reliability.
Field-Validated Purity Grades and Non-Standard Parameters: Viscosity Shifts and Crystallization Behavior in Sub-Zero Storage
Our N-Benzyl-6-(4-phenylbutoxy)hexan-1-amine is available in two purity grades: technical grade (≥98%) and high-purity grade (≥99.5%). The high-purity grade is recommended for late-stage pharmaceutical synthesis where trace impurities can affect yield. A non-standard parameter we've extensively characterized is the product's crystallization behavior. At temperatures below -5°C, the compound can form a waxy solid, which, if not properly re-liquefied, leads to inhomogeneity in sampling. We recommend warming to 25°C with gentle agitation before use. Another field observation is that batch-to-batch particle size variation, when the product is solidified, can impact dissolution rates in reaction solvents. To address this, we offer custom synthesis with controlled solidification protocols. The table below compares our typical COA limits with industry expectations:
| Parameter | Our Specification | Typical Industry Limit |
|---|---|---|
| Purity (HPLC) | ≥99.5% | ≥98.0% |
| Peroxides (as H₂O₂) | ≤0.02% | ≤0.10% |
| Water (KF) | ≤0.10% | ≤0.50% |
| Related Substances | ≤0.15% each | ≤0.50% each |
These limits are validated through forced degradation studies, ensuring that the salmeterol impurity 6 reference standard meets ANDA requirements. For procurement managers, this data demonstrates our commitment to quality, making us a preferred partner for high purity intermediates.
Frequently Asked Questions
How can I request a customized COA with specific impurity profiling for CAS 97664-55-6?
To request a customized COA, contact our quality assurance team with your required impurity limits and test methods. We can include additional analyses such as GC for residual solvents, ICP-MS for elemental impurities, or particle size distribution. Each COA is batch-specific and can be tailored to your pharmacopeial or in-house standards. Please refer to the batch-specific COA for exact numerical specifications.
What is the impact of batch-to-batch particle size variation on dissolution rates?
When the product is in solid form, particle size can affect dissolution kinetics in reaction solvents. Our controlled solidification process minimizes variation, but if your process is sensitive, we can provide micronized material upon request. In our experience, dissolution in toluene at 25°C is complete within 15 minutes for particles below 100 µm.
What are the acceptable limits for related substances in Salmeterol Impurity 6?
Our standard COA limits related substances to ≤0.15% each, with total impurities ≤0.5%. Key related substances include the debenzylated amine and the 4-phenylbutoxy analog. For ANDA submissions, we can provide characterization data and reference standards for these impurities.
Sourcing and Technical Support
As a leading global manufacturer of N-Benzyl-6-(4-phenylbutoxy)hexan-1-amine, we offer comprehensive technical support, from method development to bulk logistics. Our product serves as a seamless drop-in replacement for existing supply chains, with identical technical parameters and enhanced cost-efficiency. For more information on our salmeterol intermediate, including pricing and availability, contact our team. Ready to optimize your supply chain? Reach out to our logistics team today for comprehensive specifications and tonnage availability.