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3-Aminophthalic Acid

    • Product Name 3-Aminophthalic Acid
    • Alias 3-APA
    • Einecs 242-560-0
    • Mininmum Order 1 g
    • Factory Site Tengfei Creation Center,55 Jiangjun Avenue, Jiangning District,Nanjing
    • Price Inquiry admin@sinochem-nanjing.com
    • Manufacturer Sinochem Nanjing Corporation
    • CONTACT NOW
    VTB
    Specifications

    HS Code

    742061

    Chemicalname 3-Aminophthalic Acid
    Casnumber 79-05-0
    Molecularformula C8H7NO4
    Molecularweight 181.15 g/mol
    Appearance White to off-white solid
    Meltingpoint 210-214 °C (decomposes)
    Solubilityinwater Slightly soluble
    Density 1.59 g/cm³
    Purity Typically ≥98%
    Synonyms 3-Aminobenzene-1,2-dicarboxylic acid
    Smiles C1=CC(=C(C(=C1)N)C(=O)O)C(=O)O
    Inchi InChI=1S/C8H7NO4/c9-5-2-1-3-4(6(5)7(10)11)8(12)13/h1-3H,9H2,(H,10,11)(H,12,13)
    Storagetemperature 2-8°C

    As an accredited 3-Aminophthalic Acid factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing The 3-Aminophthalic Acid is supplied in a sealed, amber glass bottle, labeled, 25 grams, with hazard and storage instructions.
    Shipping 3-Aminophthalic Acid is typically shipped in tightly sealed containers to prevent moisture ingress and contamination. It must be labeled according to relevant safety regulations and transported under ambient conditions. Ensure compliance with local, national, and international transport guidelines, such as DOT and IATA, for safe handling and delivery of chemical substances.
    Storage 3-Aminophthalic acid should be stored in a tightly closed container, in a cool, dry, and well-ventilated area, away from incompatible substances such as strong oxidizers. Protect it from moisture and direct sunlight. Ensure that the storage area is equipped with appropriate safety measures, including spill containment and ventilation systems, and restrict access to authorized personnel only.
    Application of 3-Aminophthalic Acid

    Applications of 3-Aminophthalic Acid in Industrial Manufacturing

    3-Aminophthalic Acid serves as a key intermediate in several specialized downstream industries. As a direct manufacturer with extensive experience supplying high-purity batches, we support partners globally by ensuring strict compliance with each sector's regulatory, formulation, and process integration needs. Below are principal application scenarios where 3-Aminophthalic Acid delivers critical value in established manufacturing chains.

    1. Luminol-Based Chemiluminescent Reagents for Medical Diagnostics

    3-Aminophthalic Acid functions as the principal oxidation product and signal mediator in luminol chemiluminescence assay systems. These reagents play a crucial role in clinical diagnostic kits, particularly for the detection of blood and other biologically relevant analytes. The acid appears after the peroxidase-catalyzed luminol oxidation step, giving quantifiable light emission used in high-sensitivity immunoassays and forensic sample analysis. Stringent control of material trace impurities and batch consistency directly impacts test sensitivity, background noise, and regulatory acceptance by healthcare authorities.

    Industry compliance standards

    • ISO 13485:2016 for medical device and IVD manufacturing
    • US FDA 21 CFR Part 820 QSR for diagnostics
    • European IVDR (EU) 2017/746
    • Relevant CLSI protocols for chemiluminescent assay validation

    Typical usage ratio

    • Component of post-reaction mixture—0.00005% to 0.001% w/w equivalent in working solutions; actual input calculated stoichiometrically based on luminol dose and expected peroxidase yield

    Downstream process integration

    • Generated in-situ during luminol-based kit assembly; isolated or measured as chemiluminescent endpoint product during process QC
    • Batch traceability and purity required at the point of luminol reaction setup

    Final product types

    • Clinical chemiluminescence immunoassay kits
    • Forensic blood detection spray reagents
    • Microplate-based automated detection modules
    • Rapid test strips with integrated chemiluminescence signals

    2. Intermediate in Synthesis of Advanced Dyes for Analytical Chemistry

    The unique aromatic structure and functional groups of 3-Aminophthalic Acid make it a preferred precursor in the preparation of structurally complex indicator dyes used in photometric and electrochemical analysis. Downstream manufacturers select it for the construction of heterocyclic dye systems requiring finely controlled electron-donating properties. The acid's amine and carboxyl groups enable regioselective coupling, minimizing byproducts and supporting high-purity dye production for laboratory and industrial analytics.

    Industry compliance standards

    • REACH (EC 1907/2006) substance registration and compliance for dye precursors
    • ISO 9001:2015 for analytical reagent suppliers
    • EN ISO/IEC 17025:2017 for testing and calibration labs using reference-grade dyes

    Typical usage ratio

    • Core building block—typically 0.1% to 4% by mass in dye molecule synthesis, adjusted depending on ring substitution targets and required molar yield

    Downstream process integration

    • Reaction charged in amide formation, diazotization, or condensation steps; point of addition impacts dye purity and target color characteristics
    • Strict impurity control at intermediate isolation step to enable high-fidelity final product quality

    Final product types

    • High-purity analytical dyes for UV-Vis spectrophotometry
    • Electrochemical indicator dyes for titration
    • Customized colorimetric reagents for industrial QC labs
    • Medical laboratory staining agents

    3. Synthesis of Polyimide Films for Electronics and Aerospace

    As a molecular building block, 3-Aminophthalic Acid enables the synthesis of specialty polyimides characterized by intrinsic flame resistance and excellent dielectric properties. Its substituted phthalic backbone, after polycondensation with aromatic dianhydrides, imparts mechanical stability and processability suited for circuit substrates and flexible cable insulation. Material purity and moisture content control at the precursor stage influence polymer chain length, thermal performance, and yield of conformal films in high-demand end-use environments.

    Industry compliance standards

    • UL 94 V-0/VTM-0 flame-retardancy rating requirements
    • IPC-4101 for base materials in printed circuit boards
    • RoHS Directive 2011/65/EU for electronics
    • ISO/TS 16949 for automotive and aerospace polymers

    Typical usage ratio

    • Monomer precursor—typically 5% to 12% molar ratio relative to dianhydride, tailored based on film thickness and electrical performance targets

    Downstream process integration

    • Incorporated in imidization step after polyamic acid preparation; careful stoichiometry dictates polymer viscosity and casting efficiency
    • Final integration at film or laminate formation stages

    Final product types

    • Flexible printed circuit board base films
    • High-temperature wire and cable insulation tapes
    • Dielectric membrane substrates for aerospace systems
    • Heat-resistant composite films for display and sensor technologies

    4. Fluorescent Labeling and Immunoassay Marker Manufacturing

    Downstream biochemistry and molecular diagnostics sectors employ 3-Aminophthalic Acid as a foundation for constructing fluorescently labeled probes. Its functional groups support covalent attachment of linker arms, facilitating conjugation with proteins and antibodies for use in straightforward quantitative immunoassay systems. Quality requirements for the acid prioritize low levels of side-amine impurities and high single isomer content to ensure consistent ligand fluorescence and reproducibility across routine and research-grade labeling batches.

    Industry compliance standards

    • ISO 13485:2016 for clinical diagnostics suppliers
    • US 21 CFR Part 211 (GMP) for reagent-grade chemicals
    • CLSI guidelines for analytical material validation

    Typical usage ratio

    • Labeling precursor—ranging from 0.003% to 0.05% by weight in batch immunoassay marker synthesis; adjusted per degree of labeling and desired signal strength

    Downstream process integration

    • Activated via carbodiimide chemistry or similar amidation in labeling synthesis step
    • Integration at upstream functionalization stage prior to protein conjugation

    Final product types

    • Protein and antibody-linked fluorescent markers
    • Immunoassay detection reagents for research and clinical use
    • Custom-conjugated oligonucleotide probes for nucleic acid assays
    • Calibrators for automated laboratory analyzers
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    Certification & Compliance
    More Introduction

    Introducing 3-Aminophthalic Acid: Experience and Innovation Direct from the Manufacturer

    Understanding 3-Aminophthalic Acid: Our Product, Our Process

    Years in the chemical industry have taught us that making compounds like 3-Aminophthalic Acid means more than just following a formula. Consistency, purity, and reliability anchor our approach. Each batch starts from phthalic anhydride, and through controlled aminolysis, we create a fine, pure white powder — 3-Aminophthalic Acid — with a strong reputation for reproducibility. Our line features a standard model that meets rigorous benchmarks for both purity and stability. Testing every part of the process equips us to deliver a product with high standards for moisture content, heavy metals, and ash, which we confirm through batch records. Investing in robust analytics, we verify every shipment matches customer expectations; that transparency is central to long-term business relationships in a world with growing regulatory requirements and rising customer standards.

    Specifications That Matter: Focusing on Practical Needs

    3-Aminophthalic Acid, as we manufacture it, is chosen for applications where users cannot afford to compromise on consistency or usability. Our main grade offers a purity above 98%, with negligible chloride and iron contamination. Meeting this mark is not an accident — reaching and maintaining purity at this level repeats only through careful control of raw materials, clean reactor design, and disciplined post-processing. The melting point holds at 315–320°C, matching outlined industry values and indicating true product identity and limited degradation. Water content remains under 0.2%, minimizing downstream issues for users working in sensitive syntheses or electronic materials. Bulk density and particle size distribute within defined limits so dosing works out evenly in most bench and pilot-scale processes. Each lot’s certification tracks C13/C14 labeling if requested, which shows a commitment to diverse research needs in life sciences, luminescence, or functional material development.

    Core Uses: Real-World Experience Fuels Improved Application

    We have seen 3-Aminophthalic Acid serve as the linchpin in chemiluminescent detection systems, where its role in luminol-based assays quickly brings out precision in both medical diagnostics and quantitative research. As manufacturers, we work closely with partners who rely on this molecule for consistent, high-output signals — especially when looking for minute traces of blood or monitoring enzyme activity. The amine group at the 3-position offers unique reactivity when compared to common phthalic acids, making the compound a smart starting material for synthesizing pharmaceutical intermediates or functionalized polymers.

    Our clients in analytical chemistry reach out specifically for our 3-Aminophthalic Acid due to its reliable background in chemiluminescent systems. In these settings, any impurity or measurement drift can throw off detection results or cause false positives. We regularly receive lab reports from customers highlighting that our material, through batch-to-batch consistency, minimizes those risks. We also see increasing orders from research groups optimizing new photoactive or electrically active materials, where the amino substitution enables further molecular engineering.

    Clients often ask about biocompatibility or downstream purification. From our end, no major complaints have arisen regarding unwanted background residue, and our production setup — using high-grade glass-lined reactors and inert atmospheres — continues to play a part in this reliability. Our approach does not stop at basic supply; we field practical questions about storage, solution stability, and handling for both small laboratories and larger contract manufacturers. Direct communication lines mean that when there’s a problem, it reaches us, and we adapt or troubleshoot on the ground.

    Why 3-Aminophthalic Acid? Differences Stemming from Hands-on Production

    Many organizations have tested other phthalic acid derivatives but return to the 3-amino variant for its singular chemical characteristics and broader reactivity. Isophthalic and terephthalic acids lack the amine’s nucleophilicity, meaning that steps such as acylation, diazotization, or selective reduction either slow down or need harsher conditions. Even the familiar luminol, while better known, depends on the intermediate generation of 3-Aminophthalic Acid in situ for its signature blue glow in chemical detection; pre-supplied pure material speeds screening and enables new detection chemistries that standard luminol alone does not support.

    Some alternative products claim similar results, especially when substituting for amino- or nitro-substituted phthalic acids in dye or pigment synthesis. In head-to-head runs, we have seen that switching out the 3-amino group sacrifices flexibility in derivative synthesis. Clients running large-screen cost analyses feed that back to us; small cost differences at the raw material stage quickly add up in failure rates or slower research progress.

    Product longevity stands out as another difference. We revalidate product shelf-stability every few months, storing all reference batches under real use-conditions so users get real guidance instead of shelf-life guesses. Some competing suppliers provide shorter shelf-life assurances or ambiguous guidance, which can disrupt planning in regulated sectors like medtech or research supply. Stability data on our certificates grew out of regular, not occasional, monitoring.

    Purity assurance involves more than a single analytic technique. Throughout our journey, relying solely on classical methods — such as melting point or TLC — missed subtle impurities that only NMR or HPLC reveal. We invested in these because certain downstream applications, including peptide synthesis, become vulnerable even to low-level contamination by related phthalic isomers. Providing expanded analytical support is an ongoing, direct response to conversations with purchasing and R&D groups; facing the realities of contamination in actual synthetic runs has made our QC more comprehensive with every cycle.

    Common Questions and Our Perspective on Practical Use

    From a manufacturer’s vantage point, the recurring buyer questions range from reactivity under different pH conditions to packaging options that resist moisture ingress over long transit. We continue to rely on packout lines with controlled humidity and tamper-evident closures. Our production team frequently ships custom lot sizes for pilot and scale-up trials, with feedback going straight into process revisions.

    No two application fields view 3-Aminophthalic Acid exactly the same way. Diagnostic kit developers count on a fast, repeatable signal after oxidative activation. Academics working on new sensors or dyes value precision in reactivity, so they avoid materials that bring unknown degradation pathways. Our role stays active — supporting these outcomes rather than staying in the background.

    Handling advice from our lab includes guidance on solution preparation, filtration, and potential interferences in more complex formulations. For example, some clients preparing high-concentration solutions for coupling reactions note that clumping can appear if mixing occurs too quickly. Based on our experience, gentle staged dissolution with moderate stirring cuts down on foaming or caking. We share practical bench-level advice to bypass routine hurdles.

    The environmental and safety profile for 3-Aminophthalic Acid comes up more now than in years past. Through regular review of our air, water, and dust controls, we confirm that exposure levels hitting the end user remain below regulatory thresholds. Each safety data sheet links back to routine in-house handling, not just literature values. Hands-on monitoring in actual production settings means our team spots and addresses acute issues, such as static buildup or accidental spills, long before they ever turn into a customer complaint or product recall. Staying vigilant on these basics earns us consistent feedback from EHS auditors.

    Meeting Specialized Requirements: How We Adapt

    One major challenge comes from customers experimenting with advanced labeling or conjugation chemistry. Some want 13C or deuterium labeling for mass spec work — requests we fulfill through strategic sourcing and controlled synthesis environments. In these cases, we do not outsource; the control over label positioning and retention in the finished material remains with our own chemists, building trust over years of high-impact projects. Sometimes, requests arise for blends or custom packs suitable for direct use in automated lines. Having our own flexible packaging facility makes that possible without the longer lead times seen with repackers or third-party handlers.

    Real-world troubleshooting forms the backbone of our technical support. Once, a consortium involved in new solar cell materials flagged crystallization problems downstream — we traced the root cause to elevated ionic impurities that crept in with a single container batch. Resolving the issue involved reevaluating our post-filtration rinse procedure, and after that, many customers reported less downtime in cleaning and purifying their end products. These lived experiences shape refinements not just for single cases, but for every customer thereafter.

    Demand for higher-purity or tailored grades, especially for pharma R&D, keeps pushing our purification trains further. We add charcoal treatment and finer filtration in prep runs serving this segment. Beyond molecular purity, our production team incorporates expanded end-use testing, checking reactivity with model amines or acid chlorides to catch problems no simple purity test will reveal. These habits, born from continual feedback loops, separate a real manufacturer’s approach from that of repackagers or standard distributors.

    Environmental Considerations and Continuous Innovation

    Every year, expectations rise regarding environmental accountability. Our facility invests in solvent recovery systems and in-process waste treatment to push down emissions and resource consumption. We reclaim over 90% of rinse solvents and treat acid effluents to food-grade standards before release. On the energy front, recovering heat from exothermic synthesis cycles keeps our utility bills, and by extension, our product’s energy footprint, lower than average. These commitments extend from boardroom targets to real process engineering on the floor; periodic upgrades to reactors or purification trains do not take place in a vacuum — we aim for measurable gains that become visible in audit reviews and customer CO2 reporting.

    We often advise clients looking to cut waste streams from their in-house modifications of 3-Aminophthalic Acid, sharing tips for improved crystallization, alternative solvent plans, or recycling protocols. Many graduate that insight into process improvements of their own, feeding back new findings that inform our next wave of plant upgrades.

    Regulation, Documentation, and the Manufacturer’s Promise

    Tracking regulatory change never slows down. Whether updates come through REACH, TSCA, or Asian regulations, we set aside resources for compliance verification. Our documentation teams keep up with the evolving requirements for restricted substances, extended safety data sheets, and full traceability on origin and processing. Each certificate matches not just product composition but full batch genealogy, demanded by major customers subject to external audits. These are not box-checking steps but living documents — product stewardship in action — meant to hold up in both customer and regulatory scrutiny. We see value in every certificate and logbook, knowing that they provide concrete backup in the event of question or incident review.

    In some regions, pharmaceutical and food contact approvals carry higher weight. We conduct supporting impurity and extractable testing to satisfy even these stringencies, and carry out third-party audits to supplement in-house work. No shortcuts, no outsourcing of key steps. Our reputation stands on what our team delivers and records, day to day, year after year.

    Why Direct Manufacturing Matters: Perspective from the Production Floor

    Dealing directly with us brings advantages that reach beyond cost. We build relationships with raw material suppliers, run in-line controls, and adjust processes as demand, chemistry, or application needs shift. Every sample and order that leaves our facility has benefited from immediate feedback loops involving production, quality, and support. Contrast this with distributor-only models, where feedback delays or a missing process detail can spell rejected lots or research setbacks.

    Have a specialty requirement? From small gram samples for discovery phase trials to full metric ton campaigns for specialty blends, we respond in real time with documentation and lot support. Our plant engineers share every shortcut or discovery not as faceless responses but as guidance drawn from actual product runs — the difference becomes clear when a shipment or technical need faces an unexpected hurdle.

    We stay invested in the discipline of manufacturing innovation because we experience its impact up close. Innovations born out of floor-level observation and experiment — not just boardroom mandates — keep our line moving, our waste down, and our customers’ experience secure. We do not retreat from complexity or special requests. We see them as part of the shifting landscape that keeps a real chemical manufacturer essential to countless projects worldwide.

    Community and Knowledge: Building on Shared Experience

    Our customers range wide — from life sciences labs to advanced materials developers, from international pharma to start-up diagnostic kit makers. By keeping communication open, we hear directly about failed syntheses, surprising successes, and routine hurdles. This flow of information means we adapt to application shifts promptly. Working directly with the research and operations communities, we update methods, react to new safety data, and pivot to environmental priorities before regulation demands it.

    Inside our facility, process reviews and open forums let every production worker, engineer, or QC chemist raise improvement ideas, which often lead to product improvements or protocol updates. That sense of shared mission — among our staff and our clients — keeps our processes rooted in the needs and realities of end users.

    Staying responsive rewards us with return clients and project wins, but it also brings a steady stream of learning and incentive to keep raising our own bar. Our investment in 3-Aminophthalic Acid does not end with routine manufacture — it extends to everything that supports user success, from data sheets to actual use cases to regulatory change.

    The Practical Value of 3-Aminophthalic Acid — Direct from the Source

    Every kilogram of 3-Aminophthalic Acid from our production carries a story built on repeated experience, continuous adaptation, and the confidence that comes only from direct hands-on manufacture. Whether destined for a new luminescent assay, a pharmaceutical intermediate, or a custom engineered material, our compound arrives supported by real data, real stories, and the assurance that the person behind your order knows the molecule, the batch, and the way it was made from the ground up. We see ourselves as partners in progress, eager to put chemical expertise and a commitment to quality in service of your latest ambition.