Overview
Hematin, chemically known as chloro(protoheme)iron, is an oxidized derivative of heme where the iron atom is in the ferric state (Fe3+). It is a dark brown to black crystalline powder primarily used in biochemical and pharmaceutical research. Hematin plays a critical role in studying heme-related biological processes and serves as a precursor in synthesizing heme-based pharmaceuticals. As a naturally occurring compound, hematin is structurally similar to heme but differs in its oxidation state. This property makes it valuable for investigating enzymatic reactions involving heme proteins, such as cytochromes and peroxidases. In industrial settings, hematin is often sourced from heme extracted from animal blood or synthesized chemically.
Physical and Chemical Properties
Hematin exhibits distinct physical and chemical properties due to its iron-centered porphyrin structure. It is insoluble in neutral water but dissolves in alkaline solutions, forming a characteristic reddish-brown color. The compound decomposes at temperatures above 300°C without a distinct boiling point. Chemically, hematin acts as a weak acid and can participate in redox reactions, making it useful in catalytic studies. Its iron content (approximately 8.5% by weight) allows for spectroscopic analysis using UV-Vis and EPR techniques. The chloride ligand in hematin contributes to its stability, though it remains sensitive to prolonged exposure to light and air.
Main Applications
Hematin's primary applications lie in research and pharmaceutical development. It serves as a standard reagent for studying heme oxygenase activity, cytochrome P450 systems, and other heme-dependent enzymes. In clinical settings, hematin derivatives are explored for treating porphyria, a group of disorders related to heme biosynthesis. Industrially, hematin is used to produce heme-based supplements and diagnostic kits. Its ability to bind oxygen and other small molecules makes it valuable in biosensor development. Additionally, hematin finds niche applications in cosmetics and food coloring, though these uses are less common due to regulatory restrictions.
Safety and Storage
Handling hematin requires standard laboratory precautions. It may cause eye and skin irritation upon contact, and inhalation of dust should be avoided. Personal protective equipment (PPE) such as gloves, goggles, and lab coats is recommended when working with this compound. For storage, hematin should be kept in a tightly sealed container under inert gas (e.g., nitrogen) to prevent oxidation. Optimal conditions include a cool (below 25°C), dry environment away from direct sunlight. Long-term stability is improved when stored at -20°C, though repeated freeze-thaw cycles should be minimized.
B2B Procurement Guide
When procuring hematin commercially, buyers should prioritize suppliers with ISO certification or GMP compliance for pharmaceutical-grade material. Key specifications to verify include purity (typically 90-98%), residual solvent content, and heavy metal contamination levels. Bulk purchases (100g+) often qualify for discounted pricing, but sample testing is advisable to confirm quality. Lead times vary depending on synthesis complexity; custom modifications (e.g., isotopic labeling) may require extended production schedules. For research applications, smaller quantities (1-10g) are commonly available from specialty chemical distributors.
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