Overview
Pyrogallol Red is an organosulfonate compound derived from pyrogallol, primarily employed as a colorimetric reagent in biochemical and analytical applications. Developed as an alternative to Folin-Ciocalteu reagent, it gained prominence for its sensitivity in protein assays and selective metal ion chelation. The dye exhibits a distinct red color in solution, shifting to blue-purple upon binding with specific analytes. As a synthetic trihydroxybenzene derivative, it offers advantages in stability and reproducibility compared to natural phenol-based indicators. Its adoption spans clinical laboratories, environmental testing, and material science, particularly where precise quantitative analysis is required.
Physical and Chemical Properties
Pyrogallol Red exists as a hygroscopic crystalline powder with maximum absorbance at 540 nm in aqueous solutions. Its chromogenic behavior is pH-dependent, transitioning from yellow (pH <2) to red (pH 4-8) and purple (pH >10). The compound forms stable 1:1 complexes with trivalent metal ions, exhibiting molar absorptivity up to 5×10⁴ L·mol⁻¹·cm⁻¹. Thermogravimetric analysis shows decomposition above 300°C without distinct melting. Its sulfonate groups enhance water solubility (>50 g/L at 25°C), while polar organic solvents like methanol and DMSO achieve 10-20% solubility. The sodium salt form ensures better shelf stability compared to free acid variants.
Main Applications
In clinical diagnostics, Pyrogallol Red is integral to modified Lowry protein assays, offering linear response ranges of 1-50 μg/mL with bovine serum albumin standards. It detects proteins through tyrosine/tryptophan residues, producing 3-5x greater sensitivity than Coomassie-based methods. Environmental labs utilize its selective binding with aluminum and gallium ions for wastewater metal analysis (detection limits ~0.1 ppm). Industrial applications include dye-interference tests for membrane integrity and as a redox indicator in electrochemical sensors. Recent research explores nanoparticle conjugation for enhanced biosensing platforms.
Safety and Storage
As a moderate irritant (GHS Category 2), Pyrogallol Red requires gloves and eye protection during handling. Powder dispersal may cause respiratory tract irritation—use fume hoods for bulk quantities. Spills should be contained with inert absorbents and disposed as hazardous organic waste. Long-term storage mandates airtight containers with desiccants, maintained at 15-25°C. Solutions remain stable for 1 month when refrigerated (4°C) in amber glass, but precipitate formation indicates degradation. Incompatibilities include strong acids/bases and heavy metal salts, which may catalyze decomposition.
B2B Procurement Guide
Bulk purchasers should verify HPLC purity certificates (≥98% for trace metal analysis), with batch-specific UV-Vis spectra. Technical grade (90-95%) suffices for industrial staining applications. Preferred packaging includes nitrogen-flushed foil bags (1-5 kg) or polyethylene-lined drums (25+ kg). Lead times typically range 2-4 weeks for custom quantities. Key suppliers differentiate through ISO 17034 accreditation for reference materials. MOQs start at 100g for lab-grade, with 10-15% discounts for >1kg orders. Consider requesting stability data for tropical climate shipments.
Related Manufacturers
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