Overview
Hematoxylin is a naturally occurring compound extracted from the heartwood of the logwood tree (Haematoxylum campechianum), native to Central America. It has been used as a dye since the 16th century and is now indispensable in histology for staining cell nuclei. When oxidized to hematein and combined with a mordant (e.g., aluminum salts), it forms a blue-black complex that binds to DNA, enabling clear visualization of cellular structures under a microscope. In modern laboratories, hematoxylin is a cornerstone of the Hematoxylin and Eosin (H&E) staining technique, which differentiates nuclei (stained blue-purple) from cytoplasmic components (stained pink by eosin). Its reliability and specificity make it a standard in pathology, cancer research, and educational settings.
Physical and Chemical Properties
Hematoxylin appears as a light yellow to reddish-brown crystalline powder. It is moderately soluble in water and more soluble in organic solvents like ethanol and glycerol. The compound decomposes at temperatures above 140°C, so it requires careful handling during preparation. Its staining efficacy depends on oxidation to hematein, typically facilitated by sodium iodate or other oxidizing agents in laboratory protocols. Key chemical interactions include forming complexes with metal ions (e.g., aluminum, iron), which act as mordants to enhance stain intensity and durability. The resulting complexes are cationic, binding selectively to anionic tissue components like nucleic acids. This property underpins its role in differentiating nuclear material in biological samples.
Main Applications
Hematoxylin's primary application is in histology, where it is used in the H&E stain to highlight cell nuclei in tissue sections. This is critical for diagnosing diseases, including cancers, by revealing abnormalities in nuclear size, shape, and distribution. Beyond medicine, it finds niche uses in textile dyeing (though synthetic alternatives are more common) and as a pH indicator, turning red in acidic solutions and blue in alkaline conditions. In research, hematoxylin aids in studying tissue architecture and cellular morphology. Its compatibility with other stains (e.g., eosin, immunohistochemical markers) allows multiplexed analyses. Recent advancements include modified formulations for automated staining systems, improving consistency in high-throughput diagnostic labs.
Safety and Storage
Hematoxylin is classified as an irritant, requiring precautions such as gloves, goggles, and fume hoods during handling. Prolonged exposure to dust may cause respiratory irritation, and contact with skin or eyes can lead to inflammation. Proper storage involves keeping the powder in airtight containers, protected from light and moisture, at room temperature (15-25°C). Oxidized solutions (e.g., Harris’s hematoxylin) have limited shelf lives and should be discarded if precipitation or color fading occurs. Disposal must comply with local regulations for chemical waste, particularly if metal mordants are present. Laboratories should maintain Material Safety Data Sheets (MSDS) and train personnel in emergency procedures.
B2B Procurement Guide
When procuring hematoxylin, B2B buyers should prioritize suppliers with certifications like ISO 13485 for medical-grade products. Key specifications include purity (≥90% for routine staining), CAS number verification (517-28-2), and absence of contaminants (e.g., heavy metals). Bulk purchases (1kg+) may reduce costs by approximately 10-20%, but storage capacity must align with usage rates to avoid degradation. For diagnostic applications, pre-mixed staining kits with standardized protocols are recommended to ensure reproducibility. Buyers should also confirm compliance with regional regulations (e.g., FDA for the U.S., CE for the EU). Sample testing before large orders is advisable to assess batch consistency. Leading manufacturers include Sigma-Aldrich, Thermo Fisher, and local specialized chemical distributors.
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