Overview
Clove is the aromatic dried flower bud of Syzygium aromaticum, an evergreen tree native to the Maluku Islands in Indonesia. Historically traded as a luxury spice, it now serves diverse industries due to its high eugenol content. The buds are hand-picked before flowering and sun-dried, developing their characteristic dark brown color and intense fragrance. In B2B contexts, cloves are traded as whole buds, ground powder, or extracted oils. Major producers include Indonesia, Madagascar, and Sri Lanka. The spice's value chain spans agriculture, food processing, pharmaceuticals, and cosmetics, with strict quality controls for industrial buyers.
Physical and Chemical Properties
Clove buds contain 15-20% essential oil, of which 70-90% is eugenol—a phenylpropene compound responsible for its antiseptic and analgesic properties. The oil also contains acetyl eugenol, β-caryophyllene, and vanillin. When fresh, buds have a pungent, warm aroma with woody undertones. Eugenol's low melting point makes clove oil volatile at room temperature. The spice is hygroscopic, requiring moisture-proof packaging. Its solubility profile allows extraction in alcohol for tinctures or in fats for culinary uses. Industrial users often test for specific gravity (1.038-1.050) and refractive index (1.527-1.535) to verify purity.
Main Applications
Food industry: Clove is a key ingredient in spice blends (e.g., garam masala), baked goods, and beverages. Its antimicrobial properties extend shelf life in processed foods. Pharmaceutical sector: Eugenol is used in dental cements, mouthwashes, and topical pain relievers. Aromatherapy and cosmetics: Clove oil features in perfumes, soaps, and massage oils for its warming sensation. Industrial uses: Acts as a precursor for synthetic vanillin and as a natural preservative in animal feed. Emerging research explores its potential in biodegradable pesticides due to insect-repellent properties.
Safety and Storage
Undiluted clove oil can cause mucous membrane irritation; recommended dilution is 0.5-2% for topical use. Prolonged exposure may lead to contact dermatitis. Ingestion exceeding 2.5 g/kg body weight shows toxicity in animal studies. For bulk storage, use food-grade HDPE containers with oxygen absorbers. Optimal conditions are below 25°C at 55-65% relative humidity. Suppliers should provide certificates for heavy metals (lead <3 ppm) and aflatoxin levels. Transport requires hazmat labeling for essential oils due to flammability (flash point: 104°C).
B2B Procurement Guide
Key specifications: Buds should be intact, plump, and release oil when pressed. Moisture content below 8% prevents mold. For oils, demand GC-MS analysis showing >80% eugenol. Price depends on origin, with Indonesian 'Zanzibar' grade commanding premiums. Purchase contracts should include pesticide residue limits (EU standards: max 0.1 mg/kg for chlorpyrifos). Consider FOB prices from Surabaya or Toamasina ports. For small batches (1-5 MT), expect 10-15% higher costs than container loads. Ethical sourcing certifications (Fair Trade, organic) add 20-30% to baseline prices.
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