Overview
5,6-Dihydroxyindole (DHI) is an organic compound that serves as a critical intermediate in the biosynthesis of eumelanin, the pigment responsible for hair and skin coloration. As a powder, it appears brown to black and exhibits unique oxidative polymerization properties. First identified in melanin synthesis pathways, DHI has become commercially significant for its role in permanent hair coloring systems and cosmetic formulations. Its ability to form stable pigments through controlled oxidation makes it valuable for both industrial and research applications.
Physical and Chemical Properties
DHI powder is characterized by its low solubility in neutral water but improved solubility in alkaline conditions. The compound undergoes rapid oxidation when exposed to air, gradually darkening as it polymerizes into melanin-like structures. Thermal analysis shows decomposition rather than melting when heated above 300°C. Its reactivity is pH-dependent, with optimal stability in mildly acidic to neutral environments. Spectroscopic analysis typically confirms purity, with HPLC being the industry-standard verification method.
Main Applications
The primary use of DHI powder is in oxidative hair dye formulations, where it reacts with hydrogen peroxide to create long-lasting color molecules. It's particularly valued for natural-looking brunette and black shades in professional and consumer products. In biomedical research, DHI serves as a model compound for studying melanogenesis and neuromelanin formation. Emerging applications include conductive polymer research and UV-protective coatings, leveraging its photostable polymeric forms.
Safety and Storage
As a reactive compound, DHI powder requires careful handling to prevent undesired oxidation. Suppliers typically package it under inert gas with oxygen scavengers to extend shelf life, which is approximately 1-2 years when stored properly. Safety data sheets classify DHI as an irritant to skin and mucous membranes. Industrial users should implement engineering controls (glove boxes, local exhaust) and personal protection (nitrile gloves, goggles) during handling. Spills should be contained with inert absorbents.
B2B Procurement Guide
When sourcing DHI powder, technical buyers should prioritize suppliers that provide batch-specific certificates of analysis (COA) with HPLC purity verification (typically ≥98%). Nitrogen-flushed packaging in multi-layer foil bags ensures product stability during transit. For cosmetic applications, confirm regulatory compliance (EU/ASEAN/US FDA as applicable). Large-quantity buyers (100kg+) may negotiate 10-15% price reductions, while small R&D quantities (1-10g) command premium pricing. Consider regional logistics for temperature-sensitive shipments.
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