Technical Specifications and Quality Assurance for Benzo(a)pyrene (CAS 50-32-8)
- Strict quality control protocols ensure >=98% purity for critical analytical applications.
- Comprehensive COA documentation includes GC-MS and HPLC verification data for every batch.
- Bulk procurement options available with stable supply chain logistics for industrial users.
Benzo(a)pyrene, chemically identified as 3,4-benzopyrene or Benzo[pqr]tetraphene, is a polycyclic aromatic hydrocarbon (PAH) of significant interest in environmental science and toxicological research. With the CAS number 50-32-8 and a molecular formula of C20H12, this compound serves as a critical PAH reference standard for calibration in chromatographic systems. The molecular weight of 252.31 g/mol requires precise handling and characterization to ensure data integrity in regulatory testing. As industries tighten compliance regarding pollutants, the demand for materials with verified industrial purity has surged. Manufacturers must adhere to rigorous synthesis and purification protocols to meet the expectations of laboratories engaged in environmental monitoring and food safety analysis.
At NINGBO INNO PHARMCHEM CO.,LTD., we prioritize the chemical integrity of our catalog. Our production facilities utilize advanced crystallization and sublimation techniques to minimize isomeric impurities, such as benzo[e]pyrene, which can interfere with quantitative analysis. This commitment to quality ensures that researchers receive an analytical reagent capable of delivering reproducible results in high-stakes regulatory environments.
Verifying HPLC Grade Purity Specifications
The designation of purity in fine chemicals is not merely a label but a result of exhaustive chromatographic separation and detection. When sourcing high-purity HPLC grade materials, buyers should scrutinize the detection methods used during quality control. Standard protocols involve High-Performance Liquid Chromatography coupled with Fluorescence Detection (HPLC-FLD) or UV detection, given the strong fluorescent properties of Benzopyrene derivatives. The purity threshold for analytical standards typically exceeds 98%, whereas industrial grades may vary based on specific application requirements.
Synthesis routes for Benzo(a)pyrene often involve cyclization processes that can generate structurally similar byproducts. Therefore, the separation efficiency during the final purification stage is paramount. Impurities must be quantified and listed explicitly in the technical documentation. A robust quality assurance program will include spike recovery tests to ensure the material performs correctly as a calibration solution component. Furthermore, compatibility with various solvents is essential for method development. While the compound is insoluble in water, it demonstrates high solubility in organic solvents such as DMSO, where concentrations up to 25 mg/mL can be achieved for stock solution preparation. This solubility profile is critical for analysts preparing serial dilutions for GC-MS standard curves.
Understanding Certificate of Analysis Data
The Certificate of Analysis (COA) is the definitive document verifying the quality of the chemical supplied. For a global manufacturer serving the B2B sector, the COA must provide transparent data regarding identity, purity, and physical constants. Buyers should look for specific entries that confirm the molecular structure and absence of significant contaminants. Below is a representative specification table outlining the critical parameters expected for high-quality Benzo(a)pyrene.
| Parameter | Specification | Test Method |
|---|---|---|
| CAS Number | 50-32-8 | Registry Verification |
| Molecular Formula | C20H12 | Elemental Analysis |
| Molecular Weight | 252.31 g/mol | Calculated |
| Purity (HPLC) | ≥ 98.0% | Area Normalization |
| Appearance | Yellow to Orange Crystalline Powder | Visual Inspection |
| Loss on Drying | ≤ 0.5% | Karl Fischer / Oven |
Each batch released for commercial distribution undergoes validation against these standards. The identity is confirmed using mass spectrometry to match the expected fragmentation pattern of C20H12. Additionally, the purity assessment via HPLC ensures that the main peak accounts for the vast majority of the total area, minimizing the risk of interference from co-eluting compounds. This level of documentation is essential for laboratories maintaining ISO accreditation or complying with EPA methods for PAH analysis.
Batch Consistency and Stability Testing
Consistency across production batches is a hallmark of reliable chemical supply. Variations in crystal habit or particle size can affect solubility rates and weighing accuracy during standard preparation. To mitigate this, NINGBO INNO PHARMCHEM CO.,LTD. implements strict process controls during the final milling and packaging stages. Stability testing is conducted to determine the shelf life and appropriate storage conditions for the material. Benzo(a)pyrene is light-sensitive and should be stored in amber glass containers at controlled temperatures to prevent degradation.
Long-term stability studies indicate that when stored correctly, the compound retains its potency and purity profile for extended periods. However, once dissolved into stock solutions, stability becomes dependent on the solvent system. For instance, DMSO master liquids should be prepared fresh or aliquoted and frozen to prevent hydrolysis or oxidation. When preparing in vivo formulations or complex matrices, solvents like PEG300 or Tween 80 may be utilized, but clarity must be ensured at each step to prevent precipitation. Physical methods such as vortexing or ultrasound can aid dissolving, but care must be taken not to degrade the analyte through excessive heat.
Procurement teams should prioritize suppliers who offer bulk pricing structures without compromising on these stability guarantees. Access to large-scale quantities ensures that long-term research projects are not interrupted by supply chain discontinuities. By selecting a partner committed to technical excellence and transparent reporting, laboratories can maintain the integrity of their environmental monitoring programs. The availability of detailed technical dossiers alongside the physical product further supports regulatory compliance and audit readiness.
In conclusion, the selection of Benzo(a)pyrene for analytical or industrial use requires a thorough evaluation of purity specifications, documentation, and supply chain reliability. Ensuring that the material meets stringent chromatographic standards protects the validity of downstream data. Partnering with an established entity ensures access to consistent quality and technical support.