3-Nitrophthalic Acid Sigma-Aldrich Equivalent Supplier | High Purity
Validating HPLC Purity ≥99.0% Against Sigma-Aldrich 137820 Reference Standards
In pharmaceutical intermediate sourcing, consistency in analytical validation is paramount. When evaluating a 3-Nitrophthalic Acid Sigma-Aldrich equivalent supplier, the primary metric is High-Performance Liquid Chromatography (HPLC) purity relative to established catalog benchmarks such as 137820. Our production batches are engineered to meet or exceed the 99.0% purity threshold typically required for sensitive organic synthesis. At NINGBO INNO PHARMCHEM CO.,LTD., we utilize validated HPLC methods to ensure that the area percent of the main peak corresponds strictly to the specified purity, minimizing the risk of downstream reaction failures.
It is critical to note that standard titration methods may yield different results compared to HPLC due to the presence of isomeric impurities or residual acids. Our quality control protocol prioritizes chromatographic separation to detect trace related substances that could interfere with catalytic processes. We recommend requesting a comparative chromatogram during your vendor qualification process to verify peak resolution and retention time alignment with your internal reference standards.
Critical Certificate of Analysis (COA) Parameters for 3-Nitrophthalic Acid CAS 603-11-2
A robust Certificate of Analysis (COA) is the foundation of technical procurement. For 3-nitrobenzene-1, 2-dicarboxylic acid, specific physical and chemical parameters must be verified beyond simple purity claims. The following table outlines the critical specifications aligned with industry standards for R&D and production grade material.
| Parameter | Specification Standard | Typical Result | Test Method |
|---|---|---|---|
| CAS Number | 603-11-2 | 603-11-2 | IR Comparison |
| Molecular Formula | C8H5NO6 | C8H5NO6 | Calculation |
| Molecular Weight | 211.13 g/mol | 211.13 g/mol | Calculation |
| Purity (HPLC) | ≥ 99.0% | ≥ 99.2% | HPLC Area % |
| Melting Point | 210 °C (dec.) | 209-211 °C | DSC / Capillary |
| Appearance | Off-white to Light Yellow | Light Yellow Powder | Visual |
| Water Content | ≤ 0.5% | ≤ 0.3% | Karl Fischer |
Deviation in any of these parameters, particularly melting point and water content, can indicate issues with crystallization or drying processes. Please refer to the batch-specific COA for exact lot data.
Technical Specification Alignment for R&D Grade 99% Purity and Melting Point Stability
Thermal stability is a non-negotiable attribute for 3-nitro-1, 2-benzenedicarboxylic acid, especially when used in high-temperature cyclization reactions. The literature melting point is cited at 210 °C with decomposition. However, in practical field applications, we observe that the onset of thermal degradation can vary slightly based on the heating rate and sample preparation. Our engineering team monitors the decomposition threshold closely to ensure it remains within the 210-216 °C range.
A critical non-standard parameter we track is the color stability during storage. Trace metal impurities or exposure to elevated temperatures during transit can cause the off-white powder to shift towards a deeper tan or orange hue. This color shift often correlates with oxidative degradation of the nitro group or the formation of trace quinone-like structures. While this may not always impact HPLC purity significantly, it can affect the visual quality of the final pharmaceutical active ingredient. We control this by optimizing the recrystallization solvent system and ensuring opaque, moisture-barrier packaging.
Impurity Profiling Standards for Pomalidomide Synthesis and Related Substances
In the synthesis of immunomodulatory imide drugs such as Pomalidomide, the impurity profile of the starting material is directly linked to the purification burden of the final API. 3-Nitrophthalic acid acts as a key building block, and specific isomers like 4-nitrophthalic acid must be controlled to negligible levels. Our manufacturing process for o-nitrophthalic acid is designed to minimize regio-isomer formation during the nitration of phthalic anhydride.
Residual solvents from the recrystallization process, typically water or ethanol, must also be quantified. High levels of residual moisture can lead to hydrolysis side reactions during amidation steps. We employ gas chromatography (GC) to screen for volatile organic compounds and Karl Fischer titration for water content. For customers scaling up Pomalidomide production, we recommend reviewing the specific impurity chromatograms to ensure no unknown peaks exceed the identification threshold.
Industrial Bulk Packaging and Batch Consistency for Scale-Up Beyond 100g Units
Transitioning from gram-scale laboratory purchases to kilogram or ton-scale production requires rigorous attention to packaging integrity. While small quantities are often supplied in glass bottles, industrial scales utilize multi-wall paper bags with polyethylene liners or 25kg fiber drums. NINGBO INNO PHARMCHEM CO.,LTD. ensures that all bulk packaging is sealed to prevent moisture ingress, which is critical given the hygroscopic nature of the carboxylic acid groups.
During winter shipping, we have observed that temperature fluctuations can cause condensation inside packaging if not properly sealed, leading to clumping or caking of the powder. This physical change can disrupt automated dosing systems. Our logistics protocol includes vacuum sealing or nitrogen flushing for large batches to maintain flowability. We ship via standard freight methods suitable for combustible solids, adhering to safety classifications without making regulatory environmental claims. Consistency across batches is maintained by retaining reserve samples from each production run for future comparison.
For detailed product specifications and availability, view our 3-Nitrophthalic Acid 603-11-2 Product Page.
Frequently Asked Questions
What is the typical lead time for bulk orders of 3-Nitrophthalic Acid?
Lead times vary based on current inventory levels and required quantity. Standard stock items may ship within one week, while custom batch production typically requires 2-4 weeks. Please contact our sales team for a specific schedule.
Can you provide a COA before shipment for validation?
Yes, we can provide a preliminary COA from the production batch reserved for your order. Final certification is issued upon completion of quality control testing prior to dispatch.
What packaging options are available for scales larger than 1kg?
We offer 25kg fiber drums with PE liners and multi-wall paper bags. Custom packaging configurations can be discussed based on your facility's handling requirements.
Is the material suitable for automated synthesis modules?
Yes, provided the material is stored correctly to prevent clumping. Our standard grading ensures free-flowing powder characteristics suitable for automated dosing systems.
Sourcing and Technical Support
Securing a reliable supply chain for critical intermediates like mononitrophthalic acid requires a partner with deep technical expertise and consistent manufacturing capabilities. We focus on delivering data-driven quality assurance to support your R&D and production goals. For custom synthesis requirements or to validate our drop-in replacement data, consult with our process engineers directly.