Darunavir Impurity 22 Reference Standard: Applications in Pharmaceutical Analysis
Pharmaceutical quality control depends on the ability to detect, identify, and quantify impurities at increasingly low concentrations. For complex active pharmaceutical ingredients (APIs) such as darunavir, impurity profiling is an essential part of analytical development, process optimization, stability evaluation, and regulatory documentation. Well-characterized impurity reference standards provide analytical laboratories with reliable materials for establishing the identity and performance of impurity-related analytical methods.
Darunavir Impurity 22 Reference Standard is one such analytical material used in pharmaceutical research and impurity investigations. Chemicea Pharmaceuticals offers Darunavir Impurity 22 as a pharmaceutical impurity reference standard for research and analytical applications. According to the Chemicea product specification, the material has CAS No. 98737-29-2, CAT. No. CP-D70004, molecular formula C15H21NO3, and molecular weight 263.33 g/mol. The product is listed as available in stock.
This article discusses the importance of Darunavir Impurity 22 in pharmaceutical analysis, its role in chromatographic method development, impurity identification, stability studies, quality control, and how specialized reference-standard suppliers such as Chemicea support pharmaceutical laboratories.
Understanding Darunavir and Its Impurity Profile
Darunavir is a protease inhibitor used in antiretroviral therapy. From an analytical perspective, its relatively complex molecular structure and manufacturing process require careful monitoring of related substances and potential degradation products.
The impurity profile of an API can originate from several sources, including starting materials, intermediates, reaction by-products, process-related substances, degradation pathways, and storage-related changes. Consequently, pharmaceutical manufacturers need analytical methods capable of distinguishing the API from structurally related substances.
Research involving darunavir has demonstrated the importance of advanced impurity profiling. Published studies have investigated process-related impurities using selective UPLC-MS/MS methods and demonstrated the ability to quantify multiple impurities at trace levels.
Forced-degradation investigations have also been used to study darunavir degradation under hydrolytic, oxidative, thermal, and photolytic conditions. Advanced analytical techniques including UPLC-MS, HRMS, NMR, FT-IR, and preparative HPLC can be used to identify and characterize degradation products.
These studies highlight why individual impurity standards are important: an analytical peak can be detected, but confidently assigning its identity requires an appropriate reference material or complementary structural characterization.
Darunavir Impurity 22 Reference Standard: Product Profile
Chemicea's product page identifies Darunavir Impurity 22 with the following analytical information:
Parameter | Details |
Product Name | Darunavir Impurity 22 |
CAT. No. | CP-D70004 |
CAS No. | 98737-29-2 |
Molecular Formula | C15H21NO3 |
Molecular Weight | 263.33 g/mol |
Chemical Name | Tert-butyl-(S)-1-((S)-oxiran-2-yl)-2-phenylethyl-carbamate |
Category | Impurity Standards |
Availability | In Stock |
The chemical name indicates a molecule containing an epoxide functionality together with a protected amino-alcohol-related structural framework. Such structural features make the compound analytically useful when laboratories need to investigate specific related substances associated with pharmaceutical synthesis or degradation pathways.
Reference standards are not simply chemical reagents. Their value lies in their application as analytical benchmarks for establishing identity, chromatographic behavior, response characteristics, and method performance.
Role in HPLC and UPLC Method Development
High-performance liquid chromatography (HPLC) and ultra-performance liquid chromatography (UPLC) are among the most important techniques used for pharmaceutical impurity analysis.
During method development, analysts need to demonstrate that the analytical procedure can separate the API from its related substances. Darunavir Impurity 22 can serve as an impurity-specific reference material during this process.
A typical analytical workflow may include:
Preparation of the impurity reference-standard solution.
Preparation of the API or formulation sample.
Chromatographic injection of individual standards.
Evaluation of retention time and peak response.
Injection of the impurity together with the API matrix.
Assessment of chromatographic separation.
Establishment of appropriate detection and quantification conditions.
Evaluation of method specificity and sensitivity.
The reference standard therefore helps analysts determine whether a particular chromatographic peak corresponds to the targeted impurity.
Modern LC-MS/MS methods can provide considerably greater selectivity than conventional UV detection, particularly when structurally related compounds occur at very low concentrations. Published work on darunavir has demonstrated trace-level quantification of multiple process-related impurities using UPLC-MS/MS.
Applications in Impurity Identification
One of the primary applications of an impurity reference standard is peak identification.
During pharmaceutical development or routine testing, chromatographic analysis may reveal additional peaks besides the principal API peak. These peaks can represent process impurities, degradation products, intermediates, or other related substances.
An authentic impurity standard allows analysts to compare the retention behavior of the suspected impurity with a known material. When combined with mass spectrometric or spectroscopic data, this comparison can strengthen the structural assignment.
For example, LC-MS can provide molecular-mass information, while NMR and other spectroscopic techniques can contribute structural evidence. Studies involving darunavir degradation products have used a combination of chromatographic, mass-spectrometric, and spectroscopic techniques for structural characterization.
This combination of reference standards and instrumental characterization is particularly valuable when developing impurity profiles for complex pharmaceutical molecules.
Importance in Stability and Forced-Degradation Studies
Stability testing is another important area in which impurity standards contribute to pharmaceutical analysis.
During forced-degradation studies, an API may be exposed to conditions such as:
Acidic hydrolysis
Basic hydrolysis
Oxidative stress
Elevated temperature
Light exposure
Humidity or other environmental stresses
The objective is not simply to create degradation but to understand potential degradation pathways and demonstrate that the analytical method can distinguish the API from its degradation products.
Research on darunavir has specifically examined degradation under hydrolytic, oxidative, thermal, and photolytic conditions.
When a degradation peak is suspected to correspond to a known impurity, an appropriate reference standard can be used for chromatographic comparison. This supports impurity identification and assists in the development of stability-indicating analytical procedures.
Supporting Method Validation
Reference standards are also important during analytical method validation.
A validated impurity method generally needs to demonstrate characteristics such as:
Specificity
Linearity
Accuracy
Precision
Limit of detection (LOD)
Limit of quantification (LOQ)
Range
Robustness
Solution stability
An impurity reference standard provides the material required to evaluate several of these parameters.
For instance, serial dilutions of Darunavir Impurity 22 can be used during method development to investigate detector response and establish sensitivity. Recovery experiments can help evaluate accuracy, while replicate preparations can contribute to precision studies.
Published work on darunavir process impurities demonstrates how impurity methods can be evaluated for parameters including specificity, linearity, LOD, LOQ, accuracy, precision, robustness, and sample-solution stability.
Application in Pharmaceutical Quality Control
Once an analytical method has been developed and validated, impurity standards can continue to support routine quality-control activities.
Quality-control laboratories may use impurity reference materials for:
Identification of specified impurities
Quantification of related substances
System suitability investigations
Analytical troubleshooting
Method transfer
Comparative testing
Stability sample evaluation
Investigation of atypical chromatographic peaks
Reliable impurity standards are especially valuable when laboratories need to investigate results close to specification limits or when an unexpected impurity appears during routine testing.
A reference standard can help distinguish between an analytical artifact and a genuine chemical impurity, provided the overall analytical procedure is appropriately designed and validated.
Reference Standards and Regulatory Documentation
Impurity characterization is an important component of pharmaceutical development and regulatory submissions. Analytical data should demonstrate appropriate control of impurities throughout manufacturing and product development.
Reference materials can support documentation associated with analytical procedures, impurity identification, method validation, stability studies, and quality-control strategies.
It is important to distinguish between commercially supplied research/reference standards and official pharmacopoeial reference substances. For example, the Indian Pharmacopoeia Commission explains that official IP Reference Substances are authenticated materials intended for uses prescribed in relevant pharmacopoeial contexts, while suitably standardized secondary or working standards may be used for routine analysis.
Therefore, laboratories should select reference materials according to their intended analytical and regulatory purpose.
Why Choose Chemicea for Darunavir Impurity Standards?
Chemicea Pharmaceuticals specializes in the development, synthesis, characterization, and global supply of pharmaceutical impurity reference standards. Its portfolio covers a broad range of pharmaceutical compounds, including process impurities, degradation products, metabolites, nitrosamines, and other specialized reference materials.
For darunavir-related analytical requirements, Chemicea's portfolio includes the API as well as multiple related compounds and impurity standards. The company's Darunavir product portfolio includes Darunavir, Darunavir Ethanolate, Darunavir Impurity A, Darunavir Impurity B, Darunavir Impurity D, an Impurity A enantiomer, and other specialized compounds.
This broader portfolio can be particularly useful for laboratories developing comprehensive impurity profiles rather than investigating a single compound in isolation.
Chemicea also provides custom synthesis services, which can be valuable when a required impurity is not readily available as a catalog product. Its stated analytical capabilities include HPLC, preparative HPLC, LC-MS, TGA, and Karl Fischer analysis, supporting the development and characterization of specialized reference materials.
Custom Synthesis and Complex Impurity Requirements
Pharmaceutical development programs frequently encounter impurities that are not commercially available or are required in specialized quantities. In such situations, custom synthesis can provide a practical solution.
Chemicea's custom-synthesis capabilities are relevant to pharmaceutical companies, CROs, analytical laboratories, and research organizations requiring challenging impurity standards.
A typical custom reference-standard project may involve:
Target identification → Synthetic route development → Laboratory synthesis → Purification → Structural characterization → Analytical evaluation → Reference-standard supply
Depending on the compound, characterization may incorporate chromatographic, mass-spectrometric, spectroscopic, and physicochemical techniques.
This approach is particularly useful for complex APIs such as darunavir, where multiple structurally related substances may need to be investigated during process development and stability studies.
Conclusion
Darunavir Impurity 22 Reference Standard is a valuable analytical material for laboratories involved in pharmaceutical impurity profiling, method development, stability investigations, and quality-control research. Chemicea lists the compound under CAT. No. CP-D70004 and CAS No. 98737-29-2, with a molecular formula of C15H21NO3 and molecular weight of 263.33 g/mol.
The broader analytical importance of darunavir impurity standards is supported by research demonstrating the use of advanced LC-MS/MS methods for process-related impurities and comprehensive analytical techniques for investigating forced-degradation products.
For pharmaceutical organizations seeking dependable impurity reference materials, Chemicea combines catalog reference standards with custom synthesis, impurity isolation and characterization, analytical support, and specialized reference-standard development. This integrated approach can help analytical scientists address routine testing requirements as well as complex impurity investigations.
By providing targeted materials such as Darunavir Impurity 22 alongside a broader portfolio of pharmaceutical reference standards, Chemicea supports the analytical workflows required to improve impurity identification, method performance, pharmaceutical quality, and research efficiency.
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