Overview
Catechu is a natural extract obtained by boiling and condensing the heartwood of Acacia catechu trees, native to South and Southeast Asia. Historically used in Ayurveda and traditional Chinese medicine, it is valued for its high tannin content and astringent properties. The extract is processed into solid blocks or powder for industrial and pharmaceutical use. Modern applications span leather tanning, textile dyeing, and as a clarifying agent in food production. Its bioactive compounds, including flavonoids and catechins, have spurred research into potential health benefits, though clinical evidence remains limited.
Physical and Chemical Properties
Catechu appears as a dark brown to black brittle mass or powder with a slightly bitter taste. Its solubility in water and alcohol makes it versatile for formulations. The primary active component, catechutannic acid, hydrolyzes to form catechin and phlobatannin upon heating. The extract exhibits strong astringency due to its tannins, which bind proteins and precipitate alkaloids. It is stable under normal storage conditions but degrades when exposed to prolonged moisture or high temperatures. Analytical methods like HPLC are used to quantify tannin content, a critical quality metric for industrial buyers.
Main Applications
In tanning, catechu binds collagen fibers to convert raw hides into durable leather, offering a natural alternative to chromium-based processes. Textile industries use it as a mordant to fix dyes on cotton and silk, yielding earthy tones. Pharmaceutical formulations leverage its antimicrobial properties in throat lozenges and anti-diarrheal preparations. Food-grade catechu serves as a clarifier in beer and fruit juices. Emerging applications include natural wood preservatives and corrosion inhibitors, driven by sustainability trends.
Safety and Storage
While generally recognized as safe in regulated quantities, catechu dust may irritate respiratory tracts; PPE like masks is recommended during handling. Prolonged skin contact can cause dryness or dermatitis due to tannin’s protein-binding action. Storage requires protection from humidity to prevent clumping. Bulk purchases should be kept in sealed containers with desiccants. Shelf life typically exceeds two years if stored below 25°C. Regulatory compliance varies by region—food and pharmaceutical grades require additional purity certifications.
B2B Procurement Guide
Key procurement criteria include tannin content (typically 40–60%), absence of synthetic adulterants, and microbial limits. Suppliers in India and Myanmar dominate production; verify sustainable sourcing practices to align with ESG goals. Pricing depends on volume and purity—industrial-grade batches (100+ kg) often cost 20–30% less per unit. Request COA (Certificate of Analysis) for heavy metals and pesticide residues. Sample testing is advised before large orders. Incoterms should specify moisture tolerance (≤8%) to avoid disputes.
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