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High Purity Cresol Purple CAS 2303017 China Suppliers and Factory
Cresol Purple is a high-precision sulfonephthalein dye specifically engineered for use as a pH indicator in rigorous laboratory and industrial environments. As a versatile chemical agent, it exhibits distinct color transitions based on the acidity or alkalinity of the solution, making it an indispensable tool for accurate pH monitoring, titration, and biochemical analysis.
Primarily available as m-Cresol Purple, this chemical offers exceptional sensitivity and sharp transition points. Its ability to protonate and deprotonate in response to pH shifts allows scientists to identify neutralization endpoints and monitor metabolic activity in microbial culture media with absolute confidence and precision.
Detailed Parameters
| CAS No. | 2303-01-7 | Molecular Formula | C21H18O5S |
|---|---|---|---|
| Molecular Weight | 382.43 | EINECS No. | 218-960-6 |
| Appearance | Tiny brown crystal powder | pH Change Range 1 | 1.2 (pink) ~ 2.8 (yellow) |
| pH Change Range 2 | 7.4 (brownish yellow) ~ 9.0 (purple) | Loss on Drying | 1.0% max. |
| Solubility | Pass in Ethanol | Application | Sulfonylurea pH Indicator |
Key Advantages
High Purity Grade
Manufactured under strict quality control to ensure minimal impurities and maximum stability for sensitive assays.
Sharp Color Transition
Provides rapid and clear visual color shifts, ensuring precise detection of pH endpoints during titrations.
Dual-Range Capability
Effective across multiple pH intervals, offering flexibility for both acidic and alkaline monitoring.
Superior Solubility
Excellent solubility in ethanol and aqueous solutions, allowing for easy preparation of indicator reagents.
Reliable Optical Properties
Standardized maximum absorption wavelengths ensure consistent results across different spectrophotometers.
Broad Compatibility
Compatible with various biochemical assays, electrophoresis tracking, and microbial culture media.
Product Gallery
Management Platforms
Inventory Control
Real-time tracking of chemical stocks to ensure seamless supply chain continuity.
Quality Assurance
Rigorous batch testing and CoA verification for every shipment of specialty chemicals.
Regulatory Compliance
Full adherence to global safety standards and chemical transportation regulations.
Technical Support
Expert guidance on application methods and concentration optimization for indicators.
Custom Packaging
Flexible packaging options tailored to laboratory or industrial scale requirements.
Rapid Logistics
Optimized shipping routes to reduce lead times for time-critical chemical research.
Investment Return Comparison
| Metric | Standard Grade | Our Premium Grade | Industrial Value |
|---|---|---|---|
| Detection Accuracy | Moderate | Ultra-High | Reduced Error Rate |
| Batch Stability | Variable | Consistent | Lower Replacement Cost |
| Color Clarity | Blurred | Sharp/Distinct | Faster Analysis Time |
| Solubility Rate | Slow | Rapid | Higher Efficiency |
| Shelf Life | Standard | Extended | Reduced Waste |
Frequently Asked Questions
Cresol Purple is primarily used as a pH indicator in titrations and as a critical component in microbial culture media to detect acid production during carbohydrate fermentation tests.
They differ in their transition ranges. m-Cresol Purple is effective in highly acidic and alkaline ranges, while Bromocresol Purple is ideal for near-neutral shifts (pH 5.2 to 6.8).
The color change is caused by the protonation and deprotonation of the sulfonephthalein structure in response to the hydrogen ion concentration (pH) of the environment.
It is soluble in ethanol, which is commonly used to prepare concentrated stock solutions before diluting them into aqueous buffers.
It should be stored in a cool, dry place, away from direct sunlight and strong oxidizing agents, in a tightly sealed container to prevent moisture absorption.
Yes, due to its defined maximum absorption wavelengths (λ1-λ4), it is highly suitable for automated optical pH monitoring and quantitative assays.
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