Magnesium dihydrogen diphosphate
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Description
E450(IX), also known as magnesium dihydrogen diphosphate, is a food additive belonging to the stabilizer category. It is a magnesium salt of diphosphoric acid (pyrophosphoric acid). Its origin is synthetic, obtained by the controlled reaction of phosphoric acid with magnesium oxide or hydroxide, followed by a partial dehydration process to form the pyrophosphate.
Industrially, it is produced by neutralizing pyrophosphoric acid with a magnesium source, such as magnesium carbonate, under controlled temperature and pH conditions. The final product is a white, crystalline powder, odorless and with a slightly acidic taste. It is soluble in water and slightly soluble in ethanol. Its main function as a stabilizer is to maintain the texture, consistency, and homogeneity of foods, preventing phase separation or unwanted crystallization. It can also act as a water retention agent, improving the juiciness of processed meats, and as an acidity regulator.
The history of its use as a food additive dates back to the mid-20th century, when polyphosphates began to be used to improve the properties of processed foods. In the European Union, it was authorized after safety evaluations by the European Food Safety Authority (EFSA) and the Scientific Committee for Food (SCF). EFSA has re-evaluated all phosphates, including E450(IX), under Regulation (EU) 257/2010, establishing a group Acceptable Daily Intake (ADI) for all phosphates of 40 mg/kg body weight per day (expressed as phosphorus). The World Health Organization (WHO) has also evaluated phosphates and established the same ADI.
Regarding food safety, E450(IX) is considered safe at authorized use levels. No significant adverse effects in humans have been identified at usual consumption levels. However, excessive consumption of phosphates can alter the calcium-phosphorus balance, especially in people with chronic kidney disease. Labeling of foods containing this additive must include its name or E number, according to European regulations.
In summary, E450(IX) is a widely used food additive considered safe by health authorities, as long as it is consumed within established limits.
E450(IX) is mainly used as a stabilizer in a wide variety of processed foods. According to Regulation (EC) 1333/2008, it is authorized in numerous food categories. Among the most common uses are: meat products (such as sausages, cooked ham, pâtés), where it acts as an emulsifier and water retainer; dairy products (processed cheeses, custards, dairy desserts), to improve texture and prevent syneresis; bakery and pastry products (sliced bread, sponge cakes), as an acidity regulator and dough improver; and beverages (isotonic drinks, juices), to stabilize suspensions.
In the Spanish market, it can be found in brands such as El Pozo (sausages), Campofrío (cooked ham), or Danone (dairy desserts). Maximum use levels vary by category: for example, in heat-treated meat products, the limit is 5 g/kg (expressed as P2O5); in processed cheeses, up to 20 g/kg; in bakery products, up to 2 g/kg. Comparatively, the FDA (USA) also allows the use of pyrophosphates in foods, with similar limits (generally as 'GRAS' when used according to good manufacturing practices). In Japan, phosphates are regulated by the Japan Food Chemical Research Foundation, with limits comparable to European ones.
It is important to note that E450(IX) is often used in combination with other phosphates to achieve synergistic effects.
Documented side effects of E450(IX) are mainly related to excessive consumption of phosphates in general. EFSA and WHO have established a group ADI of 40 mg/kg body weight per day (expressed as phosphorus). In the general population, usual consumption of foods containing this additive does not pose a health risk, as estimated intakes are below the ADI. However, high and chronic consumption of phosphates can alter the calcium-phosphorus balance, which could affect bone health (e.g., reduced bone mineral density) and increase the risk of vascular calcification, especially in people with chronic kidney disease.
The biological mechanisms involved include hormonal regulation (parathyroid hormone and fibroblast growth factor 23) that controls phosphorus homeostasis. Sensitive populations are those with renal insufficiency, as they have a reduced ability to excrete phosphorus, which can lead to hyperphosphatemia. No significant interactions with medications have been described, although antacids containing aluminum or calcium can reduce phosphate absorption.
In conclusion, EFSA and WHO consider E450(IX) safe at authorized use levels, and adverse effects are only observed in cases of excessive consumption or in vulnerable populations. There is no evidence of carcinogenic, genotoxic, or teratogenic effects in animal studies.
- Magnesium diphosphate
- Magnesium pyrophosphate
- Magnesium difosphate
- INS 450(ix)
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