Polyoxyethylene sorbitan monopalmitate polysorbate 40
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Description
E434, also known as polysorbate 40 or polyoxyethylene sorbitan monopalmitate, is a food additive emulsifier widely used in the food industry. It belongs to the polysorbate family, which are polyethoxylated sorbitan esters. It is obtained by esterifying sorbitan (derived from sorbitol) with palmitic acid (a saturated fatty acid present in palm oil) and subsequently reacting with ethylene oxide. Industrially, the process involves controlled polymerization to obtain a product with a specific degree of polyoxyethylation, ensuring the desired emulsifying properties.
Polysorbate 40 is a viscous, light yellow liquid, soluble in water and oils, with a hydrophilic-lipophilic balance (HLB) of approximately 15.6, making it effective for stabilizing oil-in-water (O/W) emulsions. Its main function is to reduce surface tension between immiscible phases, allowing the formation of stable emulsions and improving the texture, consistency, and homogeneity of products.
Historically, polysorbates were developed in the 1930s and approved as food additives in the European Union in the 1970s. The European Food Safety Authority (EFSA) has re-evaluated their safety several times, most recently in 2015, establishing an Acceptable Daily Intake (ADI) of 0-10 mg/kg body weight for the polysorbate group (E432-E436). The World Health Organization (WHO) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have also evaluated these compounds, confirming their safety at authorized use levels.
In terms of food safety, E434 is considered safe for the general population, although some studies have indicated possible effects on the intestinal microbiota at very high doses, which are not relevant for normal dietary exposure. On labeling, it must appear as 'polysorbate 40' or 'E434' in the ingredient list. No significant allergies associated with this additive have been reported, and its use is permitted in a wide variety of foods, including bakery products, ice cream, sauces, dairy drinks, and dietary supplements.
E434 is mainly used as an emulsifier in the food industry to stabilize emulsions, improve texture, and prevent phase separation. According to Regulation EC 1333/2008, it is authorized in numerous food categories, such as fine bakery products (cakes, cookies), ice cream, dairy desserts, emulsified sauces (mayonnaise, dressings), non-alcoholic beverages, dietary supplements, and processed meat products.
In the Spanish market, it is commonly found in industrial ice cream, cocoa creams, low-fat margarines, packaged milkshakes, and salad dressings. Maximum use levels vary by category, from 500 mg/kg in ice cream to 5000 mg/kg in dietary supplements. Compared to the US FDA, polysorbate 40 is classified as GRAS (Generally Recognized as Safe) and is permitted at similar levels, although with some differences in specific categories. Japan also approves it with similar restrictions.
The ADI established by EFSA and JECFA is 0-10 mg/kg bw/day for the polysorbate group, providing a wide safety margin considering the estimated dietary exposure.
Toxicological studies on E434 indicate that it is well tolerated by the body and does not present significant adverse effects at authorized use levels. EFSA, in its 2015 re-evaluation, concluded that there is no evidence of genotoxicity, carcinogenicity, or reproductive toxicity for polysorbates. Documented side effects are limited to possible mild gastrointestinal discomfort (diarrhea, flatulence) in cases of excessive consumption, well above the ADI. A study in rats showed alterations in the intestinal microbiota at very high doses (equivalent to >100 mg/kg bw/day), but these findings are not relevant for normal human exposure.
No specific sensitive populations have been identified, although individuals with pre-existing intestinal disorders may be more susceptible to high doses. No significant interactions with medications are known. WHO and JECFA support the safety of E434, establishing an ADI that includes a safety factor of 100. In conclusion, polysorbate 40 is considered safe for the average consumer, and adverse effects are only observed under extreme overdosing conditions not achievable with a normal diet.
- Polysorbate 40
- Polyoxyethylene (20) sorbitan monopalmitate
- Polyoxyethylene sorbitan monopalmitate
- Tween 40
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