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Neutral Red Iodide

    • Product Name Neutral Red Iodide
    • Alias NRI
    • Einecs 942-803-8
    • 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
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    Specifications

    HS Code

    362919

    Productname Neutral Red Iodide
    Casnumber 553-24-2
    Molecularformula C15H18ClIN4S
    Molecularweight 464.75 g/mol
    Appearance Dark brown to black powder
    Solubility Soluble in water and alcohol
    Meltingpoint Dec. above 180°C
    Absorptionmax Around 530 nm (in water)
    Storagetemperature 2-8°C
    Purity Typically ≥98%
    Synonyms C.I. 50040; Toluylene Red Iodide
    Chemicalclass Azo dye

    As an accredited Neutral Red Iodide factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.

    Packing & Storage
    Packing Neutral Red Iodide is packaged in a 5-gram amber glass bottle with a secure screw cap and detailed safety labeling.
    Shipping Neutral Red Iodide should be shipped in tightly sealed containers, protected from light and moisture. It is generally classified as a non-hazardous material but should be handled according to standard chemical safety guidelines. Ensure proper labeling and cushioning to prevent leakage or breakage during transit. Store away from incompatible substances.
    Storage Neutral Red Iodide should be stored in a tightly sealed container, protected from light and moisture, in a cool, dry, and well-ventilated area. Keep the container away from incompatible substances such as strong oxidizing agents. Store at room temperature and avoid excessive heat or humidity to preserve stability. Follow all relevant safety guidelines and local regulations for chemical storage.
    Application of Neutral Red Iodide

    Applications of Neutral Red Iodide in Industrial Manufacturing

    Neutral Red Iodide serves pivotal roles across specialized industrial sectors. As an established chemical raw material, it’s integrated into diverse manufacturing flows, where its selective performance characteristics enable precise, controlled processing. Below, we outline the principal downstream application scenarios, focusing on process integration, formulation guidance, and regulatory compliance benchmarks specific to each sector.

    1. Microbiological Culture Media Manufacturing

    Neutral Red Iodide functions as a differential staining agent in complex microbiological media, supporting precise detection and differentiation of microbial strains in clinical, pharmaceutical, and industrial quality control settings. In manufacturing, formulators introduce the compound during late-stage blending to ensure consistent dye distribution, supporting accurate pH-related responses critical in high-throughput diagnostic routines. Specification alignment with pharmacopoeial standards and batch traceability underpin every production batch to address process validation and audit demands in biomedical environments.

    Industry compliance standards

    • United States Pharmacopeia (USP) Section (Microbiological Media)
    • European Pharmacopoeia (Ph. Eur.) 2.6.1
    • ISO 11133:2014 (Preparation, production, storage and performance testing of culture media)
    • US FDA cGMP, 21 CFR Parts 210 and 211

    Typical usage ratio

    • Concentration levels typically range from 0.001% to 0.003% weight/volume, adjusted by media type and detection endpoint. Higher pH sensitivity applications may require tailored increments within validated laboratory parameters.

    Downstream process integration

    • Formulators add the dye after sterilization and cooling of base media to prevent thermal degradation. Strict in-process controls ensure homogeneity and light stability throughout media packaging.

    Final product types

    • Ready-to-use agar plates
    • Liquid diagnostic broths
    • Chromogenic test media
    • Selective enumeration agar for industrial QC

    2. Analytical Chemistry Reagent Production

    This compound acts as a pH indicator and redox marker in analytical laboratories, particularly for environmental testing kits and titration products requiring high specificity. Industrial reagent blenders synchronize QC batch records to international standards for trace measurement controls. Each manufacturing lot adheres to traceability frameworks to enable downstream users—such as environmental labs or petrochemical QC technicians—to verify the reliability and consistency of results in regulated settings.

    Industry compliance standards

    • ISO 9001:2015 (Quality Management for Chemical Reagent Manufacturing)
    • REACH Regulation (EC) No 1907/2006
    • ASTM D1293 (Standard Test Methods for pH of Water)
    • EPA Standard Methods for Examination of Water and Wastewater

    Typical usage ratio

    • Standard solution blending uses 0.0005% to 0.002% by volume for pH indicator products. Titration formulations may adjust within this band based on end-point sensitivity required by environmental directives.

    Downstream process integration

    • Producers dissolve raw Neutral Red Iodide directly into deionized water or alcohol solutions, implementing optical absorbance assays as in-process controls prior to packaging in reagent-grade vials.

    Final product types

    • pH indicator kits for water analysis
    • Redox titration reagent solutions
    • Test strips for field assays
    • Certified calibration standards for analytical laboratories

    3. Biomedical Staining Solutions

    Stain preparation facilities rely on Neutral Red Iodide for cytoplasmic and nuclear staining in histopathology. Demand for diagnostic-grade dyes governed by healthcare standards necessitates rigorous control over dye purity and consistency. Accreditation to international in vitro diagnostic (IVD) standards assures hospital pathology labs of diagnostic accuracy, while supply chain traceability audits confirm input material quality for every batch released to end users.

    Industry compliance standards

    • ISO 13485:2016 (Medical Devices—Quality Management for IVD Stains)
    • CLSI Document GP44 (Procedures for the Preparation and Testing of Reagent Water in the Clinical Laboratory)
    • Directive 98/79/EC (IVD Regulation Europe)
    • US FDA 21 CFR 864.1690 (Biological Stains Special Controls)

    Typical usage ratio

    • Final solutions typically contain 0.001% to 0.01% by weight, calibrated against cellular visualization requirements and validated staining protocols provided by hospital labs.

    Downstream process integration

    • Technicians disperse the dye in buffered solution, sterile-filter, and aliquot into single-use or multi-use vials under VSCC-controlled room conditions. End-users follow calibrated pipetting protocols for slide staining.

    Final product types

    • Cytological staining solutions
    • Nuclear/cytoplasmic tissue stains for digital pathology
    • Cell viability assay reagents
    • Teaching kits for medical diagnostics

    4. Water Treatment System Tracing

    Process engineering teams employ Neutral Red Iodide as a non-toxic biological tracer in closed-loop water management systems, such as cooling towers or municipal treatment plants. Tracer deployment supports flow visualization and leak detection, facilitating regulatory compliance audits under environmental controls. Quality teams verify dye run profiles to guarantee peak performance in real-world operational environments. Downstream integration depends on real-time monitoring compatibility and dosing audit trails for each unique installation.

    Industry compliance standards

    • Environmental Protection Agency (EPA) Guidelines for Water Tracer Studies
    • ISO 5667-6:2014 (Water quality—Sampling—Part 6: Guidance on sampling of rivers and streams)
    • ANSI/ASHRAE Standard 188 (Legionellosis: Risk Management for Building Water Systems)
    • Local environmental discharge permits

    Typical usage ratio

    • Dosing ranges from 0.5 mg/L up to 5 mg/L, based on circuit volume, detection equipment, and sensitivity objectives for visual or photometric analysis. Operators calibrate input according to system size and water quality indices.

    Downstream process integration

    • Plant operators introduce the tracer into feed points upstream of key monitoring locations. Automated or manual sampling stations then record concentration peaks, enabling calculation of flow, retention, or leakage parameters.

    Final product types

    • Leak detection tracer kits
    • Hydraulic analysis service packages
    • Treated water quality monitoring solutions
    • Municipal flow validation reports
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    Competitive Neutral Red Iodide prices that fit your budget—flexible terms and customized quotes for every order.

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    Certification & Compliance
    More Introduction

    Neutral Red Iodide: Building Reliability and Clarity Into Your Research

    What Sets Our Neutral Red Iodide Apart

    Manufacturing Neutral Red Iodide has challenged us to uphold strict quality controls at every stage, from sourcing raw materials to drying and packing. Years spent troubleshooting production inconsistencies have taught us one lesson above all: the smallest details in synthesis or purification leave lasting marks on lab results. The scientists and technicians in our plant keep a close eye on batch color, purity, moisture, and the range of solubility to ensure researchers work with consistent material every time. Subtle fluctuations that sometimes pass unnoticed in other dyes—slight impurities, suboptimal drying—create background noise that frustrates researchers. With Neutral Red Iodide, we actively monitor these variables and test every single lot using UV-Vis spectrophotometry, and when appropriate, HPLC checks. We hold each batch to purity levels exceeding 98%, verified both by in-house and third-party labs.

    Our model of Neutral Red Iodide has found its home in life science research, environmental monitoring, and as a dual-function indicator and redox probe. From production runs yielding single grams for bespoke studies to multi-kilo scales supporting diagnostic kit makers, our manufacturing process stays nimble. The product is provided as a deep red crystalline powder, protected against ambient moisture and photodegradation inside amber glass. What you receive each time comes from the same protocols, the same hands-on inspection at packaging, the same attention to clarity and reactivity.

    The Pulse of Real-World Workflows

    A dye isn’t just a colorant. Our customers tell us where Neutral Red Iodide fits into their daily routines—measuring cellular pH in cytotoxicity tests, acting as a visible cell vitality indicator, or tracking redox changes in mitochondria. Iodinated derivatives often offer enhanced sensitivity and more clear-cut readouts than their non-iodinated cousins. The clean, defined color transitions of Neutral Red Iodide make it a favorite for cell biologists wanting to avoid ambiguous endpoints. Where some dyes give broad, uncertain zones of color change, we see crisp delineation at the expected pH values. It’s a level of certainty that saves wasted hours.

    What makes this dye different isn’t just the formula. Competing Neutral Red products sometimes mix in substantial side products, leaving “ghost” peaks that cause headaches in downstream workflows. We refine and recrystallize Neutral Red Iodide until it passes a broad panel of tests: colorimetric response, residue on ignition, solubility in water and buffer, and cationic purity checks. The difference becomes obvious the moment you test it in a parallel control. Customers who switch mid-project often report fewer unexplained artifacts, better reproducibility, and fewer incidents of culture contamination.

    Specifications That Follow Rigorous, Hands-On Standards

    Our Neutral Red Iodide typically delivers a purity above 98%, with the main impurity being a trace amount of neutral red. Crystallinity, particle size, and moisture content are tested visually and gravimetrically for every lot. Solubility reaches up to 10 mg/mL in most phosphate buffers at neutral pH, though for specific applications such as live cell staining, we’ve seen researchers work reliably below this limit for clearer signals. UV absorption peaks match reference standards: absorption maxima at approximately 530 nm, with strong, consistent extinction coefficients batch after batch.

    Unlike basic Neutral Red or many off-the-shelf pH indicators, the iodide form avoids some of the chemical instability that comes from halide loss—especially critical in redox cycling experiments or longer-term assay incubation. Our colleagues in the immunocytochemistry and environmental toxicology spaces say this adds days or even weeks to usable dye shelf life once rehydrated.

    Supporting Both Routine and Innovation

    We’ve watched Neutral Red Iodide bridge clinical asks and basic science over the years. Hospitals rely on us for batch-to-batch consistency because doctors and technicians demand reliable controls in cytology stains. At the other end, academic labs push the molecule into new territory—flow cytometry, single-cell imaging, automated toxicity screens. The feedback from both sides shapes our continuous improvement cycle. We purchase and test competitor samples where possible, benchmarking photostability, bleeding, cross-reactivity, and color integrity under identical side-by-side experiments. Consistently, research teams find less background noise and sharper signals in ours.

    Every step in the manufacturing chain—pre-weighing, reaction, filtration, drying, storage—draws from decades of collective experience. Employees treat each lot as a new challenge. Problems don’t stay abstract; a single off-color batch means a day’s worth of downtime and investigation until standards are restored. The culture here resists “passable” output. Even as regulatory audits and certifications grow tougher, our process anticipates traceability demands, with digital and physical records linked from initial synthesis onward. Technicians are trained to observe subtle signs of degradation or contamination, refusing to pack material that doesn’t match reference controls exactly.

    The Role of Neutral Red Iodide in Today’s Research

    The global move toward high-throughput screening has raised the bar for indicator dyes. Customers running hundreds of microplate wells daily don’t have time to recalibrate for dye drift or search for silent contaminants. In our long partnership with pharma, we’ve responded by tuning our specification and packaging practices. Each order lands with a detailed certificate of analysis. Requesting additional spectral or performance data never draws an extra fee. We know the upstream cost of bad results; quality failures become magnified across entire studies. Having built this business on trust, we want you coming back not just for the product, but for the confidence that work won’t unravel over a subtle impurity.

    Our insights into Neutral Red Iodide’s behavior in practical settings extend far beyond the catalog and the test tube. Some commercial preparations show tendency for precipitate after a week in storage—even in sealed ampoules. By tracking water content, controlling residual solvent removal, and employing genuinely light-tight storage, we resolve these weak spots before product reaches you.

    To ensure biological compatibility, we screen every batch for endotoxins and microbials, not content with basic filtration. Clients needing details on dye interaction with plasticware or cell substrates tap into our records of compatibility tests. Small choices—such as tighter controls on buffer pH or cleaner excipients—became standard years before regulations caught up.

    Not Just Another Chemical—Why It Matters

    Experience with lesser products in our own trials made a lasting impression. Inconsistent Neutral Red Iodide led to failed controls, false positives, and wasted weeks. Many chemistries can look similar on paper, but the problems emerge under the microscope. Off-color, off-odor, stubbornly insoluble samples all traced back to corners cut in manufacturing. We’ve learned to trace any issue backwards: Sometimes a blending machine left micro-traces of a prior batch, or ambient lab humidity hid in the powder. Mitigating these small risks gives our version an edge that’s easy to take for granted until the alternative fails.

    The science behind Neutral Red Iodide continues to evolve. Customers ask about possible new uses in image-guided diagnostics, environmental stress assays, or even quantum dot-labeled constructs. Transparent dialogue with our users keeps us alert to future needs. We focus on deep cleaning, thorough lot release analytics, and honest documentation rather than maximizing annual output or glossing over supply chain hiccups. Experience says dependable chemistry always beats the fast or the cheap.

    Comparisons With Other Indicator Dyes

    Researchers working across redox chemistry, supramolecular assembly, and clinical diagnostics comment on the dye’s sharper, more stable chromophore signal compared to standard Neutral Red, Methylene Blue, or basic triphenylmethane indicators. Traditional Neutral Red serves as an acid-base indicator and cell viability marker, but the iodide-derivatized version offers improvements in membrane permeability and reduced tendency toward photobleaching. In some protocols—especially real-time pH monitoring or mitochondrial activity studies—this leads to longer observation times and more robust data.

    We hear from environmental scientists who prefer Neutral Red Iodide as a sensitive probe capable of detecting trace metals or oxidative stress in aquatic samples, where basic dyes might fail to resolve small but crucial differences. The cleaner spectra and higher lot-to-lot integrity benefit quantitative assays that hinge on minute concentration differences.

    It’s tempting to believe all indicator dyes handle scale-up equally well. In practice, differences multiply as gram-scale batches turn into kilogram productions. Handling costs, waste-stream hazards, and stability in long-term storage all mount quickly. Our efforts to make manufacturing greener include closed-loop solvent capture and energy-efficient drying. Most of all, our warehouse team watches shelf life and inventory so that backorders or degraded stock can’t surprise our customers, no matter how far the shipment or how humid the region.

    Typical Applications and User Experience

    Cytologists value our Neutral Red Iodide for clean background and bright, sustained colorations in cell viability assays. Even a few micrograms per milliliter in cell culture can reliably separate living from compromised cells, with minimal background. Comparative lab work shows that substituting Neutral Red Iodide in automated plate readers or fluorometers provides measurable performance gains: lower signal variability, flatter baselines, and less enzymatic interference.

    In chemistry and electroanalytical setups, Neutral Red Iodide supports precise monitoring of electron transfer events. Its ease of dissolution speeds up sample prep. Stains survive longer, and users see less fade over multi-hour experiments. Several customer collaborations have pushed the limits of storage: samples reconstituted weeks prior gave results that matched freshly made solutions.

    Some of the most fascinating stories come from field labs, where robust dye performance means trusting every result with minimal repeat. Technical partners in water quality monitoring find Neutral Red Iodide both resilient to light exposure and easy to transport without refrigeration. Pre-weighed ampoules and tight packaging minimize contamination for users in challenging environments.

    Building Confidence: Our Manufacturing Approach

    Every decision in the plant, from equipment upgrades to raw materials sourcing, turns on consistency and batch integrity. We choose suppliers after meticulous review and periodic requalification, rather than chasing the cheapest options on the market. Raw Neutral Red passes through a multistep iodination, filtering, and recrystallization chain designed to minimize contaminant carryover. Each vessel and drying cabinet receives full cleaning and solvent flushes before new runs begin. Staff rotate between production and QC labs, ensuring an unbroken chain of responsibility from synthesis to packaging.

    Once a batch passes production, it faces a round of identity, purity, and functional assays. We run every new lot against reference standards and hold last-resort reserves of the best-performing past productions as internal controls. If customer feedback signals unexpected changes in performance, the batch comes under review and additional testing. Open communication with researchers has improved our process, giving rise to periodic enhancements in instrumentation, storage, and labeling.

    Audits by both customers and external inspectors allow us to spot weak links before they become problems. Any deviation from the quality specification means an immediate production halt and a thorough process review. These disruptions demand real attention and resources, but in the long run, every hard lesson returns value to our user community. Our records stretch back years, tracking lot numbers, test protocols, and shipment details for complete transparency.

    What Reliability Means in Practice

    A trusted Neutral Red Iodide is more than a laboratory tool to our team; it’s a promise to both routine users and innovators. From new hires to veteran chemists, there’s pride in seeing feedback from customers setting new standards in diagnostics, environmental analysis, or cellular imaging. When researchers find less variability, clearer staining, or longer signal retention, it reflects not on marketing but on hard-won gains inside the plant: better controls, smarter handling, continuous retraining.

    Many factors outside our control—regulatory changes, supply chain disruption, raw material shortages—push us to adapt, but never at the cost of traceability or performance. We keep learning from chemists facing new analytical needs, regulatory agencies tightening standards, and biologists pushing assay limits.

    What keeps our Neutral Red Iodide ahead isn’t abstract quality; it’s careful, measurable, transparent improvement. Our small team knows we share ownership of each batch and every result generated using our products. Working side by side with scientists ensures we never lose sight of the practical realities at the bench or in the field.

    Moving Forward

    Our team stands behind every container of Neutral Red Iodide that leaves the plant. We know it finds its way into studies shaping the boundaries of diagnostics, environmental health, and cellular biology. For researchers handling tight deadlines, limited samples, or challenging protocols, there’s no room for chemical ambiguity. Feedback loops between our users and our production line have shaped the dye as much as the chemistry itself.

    Customers demand reliability, but also flexibility—requests for custom packaging, pre-diluted solutions, or in-field technical support push us out of our comfort zone. We now offer neutral red iodide in several grades: analytical, cell culture, and extended shelf life, each adapted from base manufacturing processes so that performance stays true, even as formats diversify.

    With growing interest in sustainability, we continue to refine solvent reclamation, packaging, and outbound shipment methods. Throughout all this change, one principle holds: a supplier’s integrity is tested each time a customer entrusts their work to our material.

    Working as a chemical manufacturer means facing the unvarnished consequences of every decision. The product doesn’t stop at the plant door; its path stretches through every pipette, spectrophotometer, and microplate. We know that Neutral Red Iodide remains only as good as the care invested in each lot, each customer concern addressed directly, and each evolving need met with open, honest effort. It’s a trust earned, tested, and renewed at the bench with every day’s work.