リン酸

Origin

Phosphoric acid (E338) is an inorganic (mineral) acid. It is produced industrially by two general methods: the thermal process and the wet process. The thermal process involves burning elemental phosphorus and then hydrating the resulting phosphorus pentoxide. The wet process involves treating phosphate rock with sulfuric acid. The resulting phosphoric acid is then purified for use in food applications.

Usage

Phosphoric acid is widely used in the food and beverage industry. Its primary function is as an acidity regulator, adjusting the pH of various products. It is commonly found in carbonated beverages, where it contributes to the tartness and enhances the flavor profile. In cheese production, it can be used to acidify milk. It also acts as a synergist for antioxidants, improving their effectiveness. Furthermore, it can be used as a cleaning agent for food processing equipment. The typical usage levels vary depending on the application, but are generally within the range considered safe by regulatory bodies.

Side Effects

Phosphoric acid is generally considered safe for consumption at levels typically found in food and beverages. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has established an Acceptable Daily Intake (ADI) of 0-70 mg/kg body weight for phosphates (expressed as phosphorus). Excessive consumption of phosphates, including phosphoric acid, has been linked to potential health concerns, such as impaired calcium absorption, particularly in individuals with inadequate calcium intake. High phosphate levels in the blood can also be problematic for individuals with kidney disease. While rare, some individuals may experience gastrointestinal discomfort from consuming large amounts of phosphoric acid. It's important to note that the levels of phosphoric acid in most food products are well below the threshold for causing adverse effects in the general population.

Regulatory Status

Phosphoric acid (E338) is approved for use as a food additive in many countries, including the United States, the European Union, and Canada. In the EU, it is listed as E338 and is permitted for use in a variety of food products, subject to specific maximum levels. In the United States, it is Generally Recognized As Safe (GRAS) by the Food and Drug Administration (FDA) when used in accordance with good manufacturing practices. The regulatory status ensures that the use of phosphoric acid in food is monitored and controlled to protect public health.