| CAS Number | 1401-55-4 |
| Chemical Formula | C₇₆H₅₂O₄₆ |
| Solubility | soluble in water and ethanol; insoluble in ether, benzene |
| Storage Conditions | store cool, dry, dark (2–8 °C) |
| Shelf Life | 24 Months |
Tannic acid is a naturally derived, water-soluble polyphenolic compound used extensively as a clarifying agent in beverages like wine and beer, and as a flavor stabilizer providing astringency in foods.
| Step No. | Production Stage | Key Action | Control Point & Note |
|---|---|---|---|
| 1 | Raw Material Preparation | Select, clean, and crush high-tannin raw materials, typically Chinese or Turkish gallnuts. | Control Point: Quality and origin of gallnuts. Note: The raw material is the primary determinant of final product quality. It must be free from mold and foreign contaminants. Crushing to a specific particle size maximizes extraction efficiency. |
| 2 | Aqueous-Solvent Extraction | Extract the crushed material with a carefully prepared solvent mixture (typically water, ether, and/or alcohol) in a counter-current extraction system. | Control Point: Solvent ratio, extraction temperature (e.g., 60-70°C), and duration. Note: These parameters are optimized to maximize the yield of hydrolysable tannins while minimizing the extraction of unwanted impurities and preventing thermal degradation. |
| 3 | Filtration & Clarification | Filter the crude liquid extract through filter presses or centrifuges to remove all suspended solid plant matter. | Control Point: Clarity of the filtrate. Note: Complete removal of insoluble solids is critical to prevent impurities and haze in the final product. Multiple filtration stages may be used. |
| 4 | Primary Concentration | Concentrate the clarified extract by evaporating the solvent, typically using a vacuum evaporator. | Control Point: Vacuum level and temperature. Note: Operating under vacuum lowers the solvent’s boiling point, protecting the heat-sensitive tannic acid from decomposition. The solution is concentrated to a specific density. |
| 5 | Purification (Liquid-Liquid Separation) | Purify the concentrated aqueous solution by treating it with a non-miscible solvent like ethyl acetate. The tannic acid preferentially dissolves in the solvent layer. | Control Point: Purity of the separation solvent and pH of the solution. Note: This step separates the tannic acid from sugars, gallic acid, and other water-soluble impurities. Multiple separation cycles may be required for food or pharmaceutical grades. |
| 6 | Solvent Recovery & Final Concentration | Separate the purified solvent layer and recover the solvent via vacuum distillation, leaving a highly concentrated, syrupy tannic acid solution. | Control Point: Final solids concentration of the syrup. Note: Efficient solvent recovery is vital for economic and environmental reasons. The final syrup consistency must be suitable for the subsequent drying stage. |
| 7 | Drying | Convert the concentrated tannic acid syrup into a fine, light-colored powder using a spray dryer. | Control Point: Dryer inlet/outlet temperatures and atomization pressure. Note: Spray drying is the preferred method as it provides rapid drying with minimal heat exposure, resulting in a high-quality, stable, amorphous powder. |
| 8 | Finishing & Packaging | Sieve the dried powder to ensure a uniform particle size, perform final quality control tests (purity, heavy metals, ash), and package into sealed, moisture-proof containers. | Control Point: Final product specifications and packaging integrity. Note: Tannic acid is hygroscopic (absorbs moisture) and light-sensitive. Proper packaging is essential to maintain product stability and shelf-life. |
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Anrui Biotechnology Co., Ltd. is a specialized exporter of high-quality food ingredients and additives. We focus on global trade and custom formulation services for functional ingredients, delivering consistent, compliant, and premium-quality supply solutions to our worldwide clients.
Headquartered in Guangzhou, China, Anrui collaborates with GMP-certified manufacturing partners equipped with advanced testing facilities, including HPLC, UV-VIS spectrophotometry, and microbiological analysis, ensuring every batch meets strict international quality and regulatory standards.
Our products are exported to over 60 countries, serving industries such as food, beverages, supplements, and cosmetics.
Fast-moving ingredients for food factories, ready for immediate dispatch.