اسید سیتریک انهیدروس
| Formula: | C6H8O7 |
| Chemical formula: | (HOOCCH2) |
| Density: | 2C(OH)COOH |
| Molar mass: | 1.665 g/cm3 (18 °C) |
| Bulk density: | 192.13 g/mol |
| CAS number: | ~ 560 kg/m3 |
| HS code: | 77-92-9 |
| EC number: | 29181400 |
| Storage | 201-069-1 |
| (temperature): | Without limitations. |
| SDS | available |
| RTECS: | GE7350000 |
| R phrase: | R 36 |
| S phrase: | S 26 |
| Odour: | odourless |
| Form: | powder |
| Color: | white |
| Assay | 99.5 – 100.5 | % | |
| Description | Conforms | ||
| Identification | Conforms | ||
| Solubility | Conforms | ||
| Heavy metals | 0.001 | ||
| Sulfate | ≤ | 0.015 | % |
| Residue on ignition | ≤ | 0.1 | % |
| Melting point | ≤ | 153 | °C |
| Clarity of solution | ~ | Conforms | % |
Citric acid anhydrous is the water-free form of citric acid, a weak organic acid naturally found in citrus fruits. It appears as a white, odorless, crystalline powder with a strongly acidic taste. It is widely used as a food additive, preservative, acidulant, and pH regulator.
🏭⚗️ Production
Citric acid anhydrous is mainly produced by fermenting sugars (usually glucose or molasses) using the mold Aspergillus niger. After fermentation, the citric acid is isolated, purified, and then crystallized in its anhydrous form by removing water through drying processes.
🔬 Properties
Citric acid anhydrous is highly soluble in water, non-volatile, and stable under normal conditions. It functions as a triprotic acid, capable of donating three protons, which makes it effective for pH control. The anhydrous form is more stable in dry mixtures compared to the monohydrate form.
🧪 Applications
- Food industry: Used as an acidity regulator, flavor enhancer, and preservative (E330) in beverages, candies, and canned foods.
- Pharmaceuticals: Acts as a buffering agent and stabilizer in tablets, effervescent powders, and syrups.
- Cosmetics and personal care: Used to adjust pH and improve stability in skincare and haircare formulations.
- Industrial uses: Applied in cleaning products, detergents, and as a chelating agent for removing limescale.
