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Specifications
| Appearance | Yellowish green to dark green crystalline powder |
| pH Change Color Domain | 1.2 (pink) ~ 2.8 (yellow), 7.4 (brown-yellow) ~ 9.0 (purple) |
| Maximum Absorption Wavelength (nm) | λ1 (pH1.2): 526~529 λ2 (pH2.8): 431~437 λ3 (pH7.4): 431~437 λ4 (pH9.0): 576~580 |
| Mass Absorption Coefficient (L/cm·g) | α(λ1 pH1.2): 80~94 α(λ1 pH2.8): 40~46 α(λ1 pH7.4): 39~45 α(λ1 pH9.0): 75~86 |
| Ethanol Solubility Test | Pass |
| Loss on Drying | 1.0% max |
Applications
Cresol Purple is a synthetic pH indicator widely used in analytical chemistry, biochemistry, and laboratory research. It is primarily applied for monitoring pH changes in aqueous and non-aqueous solutions, with color transitions that make it suitable for titrations, pH testing, and buffer preparation. In biochemical and microbiological research, Cresol Purple is used as a component of culture media to detect pH shifts associated with microbial metabolism or enzymatic activity. It is also employed in environmental testing, such as monitoring soil, water, and industrial effluents, where pH variations provide critical information about chemical or biological processes. Additionally, Cresol Purple can be used in educational laboratories for demonstrating acid-base reactions and visualizing chemical changes.
Benefits
The benefits of Cresol Purple stem from its distinct color change, stability, and versatility across different chemical environments. Its clear and easily distinguishable color transitions allow for accurate and rapid pH detection, making it reliable for both quantitative and qualitative applications. Cresol Purple is stable over a wide pH range and compatible with various solvents, which enhances its usability in diverse laboratory and industrial settings. Its incorporation into culture media and analytical procedures provides a simple visual method for monitoring chemical or biological reactions without the need for complex instrumentation. Furthermore, its reproducibility and low interference with other reagents make it a practical and efficient choice for research, testing, and educational purposes.
Conclusion
In summary, Cresol Purple is a versatile pH indicator with applications in analytical chemistry, microbiology, environmental monitoring, and education. Its benefits include distinct color transitions, stability, ease of use, and compatibility with diverse chemical and biological systems. By combining visual clarity with practical versatility, Cresol Purple continues to be an essential tool for pH monitoring, research analysis, and laboratory demonstrations.
