E553a - synthetic magnesium silicates

Origin

Synthetic magnesium silicates are manufactured substances produced by reacting a source of magnesium with a source of silicate under controlled conditions. These silicates are not naturally occurring in the same form and purity as the manufactured additive. The composition can vary depending on the manufacturing process, resulting in different ratios of magnesium oxide (MgO) and silicon dioxide (SiO2).

Usage

E553a is primarily used as an anti-caking agent in powdered foods to prevent clumping and ensure free flow. It is also used as a filter aid. Common applications include table salt, powdered milk, spices, baking mixes, and other dry food products. The additive works by absorbing moisture and oil, thereby reducing the tendency of particles to stick together. The levels used are typically kept to a minimum necessary to achieve the desired effect.

Side Effects

Magnesium silicates are generally considered safe for consumption at the levels typically used in food. The EFSA (European Food Safety Authority) has evaluated magnesium silicates and established an Acceptable Daily Intake (ADI) of 'not specified', meaning that no adverse health effects are expected from dietary exposure. However, excessive consumption of magnesium, in general, can lead to diarrhea and abdominal discomfort in some individuals. The safety assessment considers that the particle size of the additive is not in the nano range, which would require further evaluation. Inhalation of magnesium silicate dust, particularly in occupational settings, can pose a respiratory hazard, but this is not relevant to food consumption.

Regulatory Status

E553a is permitted for use as a food additive in the European Union under Regulation (EC) No 1333/2008. The use levels are specified in Annex II of the regulation. It is also approved for use in food in other countries, including the United States, where it is regulated under the FDA. The specific regulations and permitted uses may vary by country.