Overview
Epigallocatechin gallate (EGCG) is the most abundant and biologically active catechin in green tea (Camellia sinensis). It accounts for 50-80% of the total catechins in green tea extracts. EGCG has gained significant attention for its potent antioxidant properties, which are attributed to its ability to scavenge free radicals and chelate metal ions. Research suggests that EGCG may offer various health benefits, including potential effects on weight management, cardiovascular health, and neuroprotection. Its bioavailability is relatively low due to poor absorption in the gastrointestinal tract, which has led to the development of various formulation strategies to enhance its delivery.
Physical and Chemical Properties
EGCG is a polyphenolic compound with a molecular weight of 458.37 g/mol. It appears as a white to off-white crystalline powder that is soluble in water and polar organic solvents. The compound is relatively stable under acidic conditions but can degrade in alkaline environments or when exposed to heat and light. The chemical structure of EGCG features multiple hydroxyl groups that contribute to its antioxidant activity. These groups can donate hydrogen atoms to neutralize free radicals, making EGCG particularly effective against oxidative stress. The compound's stability is pH-dependent, with optimal stability observed at pH 4-5.
Main Applications
EGCG is widely used in the dietary supplement industry, where it is marketed for its antioxidant properties and potential health benefits. It is a key ingredient in many green tea extract products and is often included in weight management formulations due to its suggested effects on metabolism. In the pharmaceutical sector, EGCG is being investigated for its potential role in cancer prevention and treatment. The cosmetic industry utilizes EGCG in skincare products for its anti-aging and anti-inflammatory properties. Additionally, EGCG is incorporated into functional foods and beverages to enhance their nutritional profile.
Safety and Storage
While EGCG is generally considered safe when consumed in moderate amounts through green tea, concentrated supplements may pose risks at high doses. Some studies have reported potential liver toxicity with excessive intake of EGCG supplements. The European Food Safety Authority (EFSA) has established an acceptable daily intake level. For storage, EGCG should be kept in airtight containers protected from light, moisture, and oxygen. Temperature should be maintained below 25°C to prevent degradation. Proper handling includes using gloves to avoid skin contact and ensuring good ventilation in the storage area.
B2B Procurement Guide
When procuring EGCG for commercial use, buyers should prioritize suppliers who provide comprehensive quality documentation. This includes certificates of analysis (CoA) verifying purity, heavy metal content, and microbial limits. HPLC testing results should confirm the EGCG content meets specification. Consider the intended application when selecting purity levels - pharmaceutical-grade EGCG (typically 95-98% purity) commands higher prices than food-grade material. Bulk buyers should negotiate long-term contracts to ensure price stability, as EGCG prices can fluctuate based on tea leaf harvest conditions and global demand.
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