What is the CITRIC ACID ?
Citric acid is a weak organic tricarboxylic acid having the chemical formula C6H8O7. It occurs naturally in citrus fruits. In biochemistry, it is an intermediate in the citric acid cycle, which occurs in the metabolism of all aerobic organisms.More than a million tons of citric acid are manufactured every year. It is used widely as an acidifier, as a flavoring and chelating agent.
Application and Uses of CITRIC ACID
Because it is one of the stronger edible acids, the dominant use of citric acid is as a flavoring and preservative in food and beverages, especially soft drinks.Within the European Union it is denoted by E number E330. Citrate salts of various metals are used to deliver those minerals in a biologically available form in many dietary supplements. The buffering properties of citrates are used to control pH in household cleaners and pharmaceuticals. In the United States the purity requirements for citric acid as a food additive are defined by the Food Chemicals Codex, which is published by the United States Pharmacopoeia (USP).
Citric acid can be added to ice cream as an emulsifying agent to keep fats from separating, to caramel to prevent sucrose crystallization, or in recipes in place of fresh lemon juice. Citric acid is used with sodium bicarbonate in a wide range of effervescent formulae, both for ingestion (e.g., powders and tablets) and for personal care (e.g., bath salts, bath bombs, and cleaning of grease). Citric acid sold in a dry powdered form is commonly sold in markets and groceries as “sour salt”, due to its physical resemblance to table salt. It has use in culinary applications, as an alternative to vinegar or lemon juice, where a pure acid is needed.
Citric acid can be used in food coloring to balance the pH level of a normally basic dye.
| Item | Unit | Quality Standards | Analysis Results |
| Characters | — | White or almost white, crystalline powder, colourless crystals or granules. Odorless, has a strongly acid taste. effloresces in dry air. Very soluble in water, freely soluble in ethanol. |
Pass |
| Identification | — | Pass Test | Pass |
| Appearance of solution | — | Pass Test | Pass |
| Assay | % | 99.5~ 100.5 | 100.1 |
| Water | % | ≤0.5 | 0.15 |
| Readily Carbonisable Substances |
— | Pass Test | Pass |
| Sulphated Ash (Residue on Ignition) |
% | ≤0.05 | 0.02 |
| Sulfate | mg/kg | ≤150 | <150 |
| Oxalate | mg/kg | ≤100 | <100 |
| Lead | mg/kg | ≤0.5 | <0.2 |
| Arsenic | mg/kg | ≤1.0 | <0.1 |
| Mercury | mg/kg | ≤1.0 | <0.5 |
| Aluminium | mg/kg | ≤0.2 | <0.2 |
| Heavy Metals | mg/kg | ≤5 | <5 |
| Bacterial endotoxins | IU/mg | <0.5 | <0.5 |
