Hexylresorcinol
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Description
E586, known as Hexylresorcinol, is a food additive classified as an antioxidant and preservative. It is an organic compound derived from resorcinol, with a six-carbon side chain (hexyl).
Its origin is synthetic, obtained by alkylation of resorcinol with hexene or hexanol in the presence of an acid catalyst. Industrially, it is purified by distillation or crystallization. Physically, it is a crystalline solid from white to pale yellow, with a characteristic phenolic odor. It is slightly soluble in water, but soluble in ethanol and oils.
Its main function is to prevent oxidation and enzymatic browning in foods, especially in crustaceans (shrimp, prawns) and fresh-cut fruits. It also has antimicrobial properties.
It was approved as a food additive in the European Union in 1995 (Directive 95/2/EC) and is currently regulated by Regulation (EC) 1333/2008. The European Food Safety Authority (EFSA) re-evaluated its safety in 2016, establishing an Acceptable Daily Intake (ADI) of 0.5 mg/kg body weight. WHO, through JECFA, also evaluated it in 1998, setting an ADI of 0.5 mg/kg. The overall safety assessment is favorable at authorized doses, although caution is recommended in people with sensitivity to phenols. On labeling, it must appear as 'Hexylresorcinol' or 'E586'.
It is important to note that this food additive has been subject to controversy due to possible irritant effects, but toxicological studies have not shown significant risks at permitted use levels.
E586 is mainly used as an antioxidant to prevent enzymatic browning in crustaceans (shrimp, prawns, crabs) and in fresh-cut fruits and vegetables (apples, potatoes, avocados). It is also used in dried fruit products and some fish preparations.
In the Spanish market, it is commonly found in packaged peeled shrimp, ready-to-eat fruit salads, and pre-cooked potatoes. According to Regulation (EC) 1333/2008, the maximum permitted limits are: 2 mg/kg in fresh or frozen crustaceans (expressed as free hexylresorcinol), and 1 mg/kg in fresh-cut fruits and vegetables. In the United States, the FDA allows it as a direct food additive with a limit of 2 mg/kg in crustaceans, and it is also used in cosmetics.
In Japan, its use is restricted to crustaceans with a similar limit. Comparatively, the EU and the US have harmonized limits, although the EU requires specific labeling.
Documented side effects of E586 are limited. In animal studies, very high doses (above 100 mg/kg) caused gastrointestinal and liver irritation. In humans, no significant adverse effects have been reported at authorized use levels. However, hexylresorcinol can cause local irritation to skin and mucous membranes upon direct contact, but this is relevant for exposed workers, not consumers.
The biological mechanism involves its action as an antioxidant, but it can also inhibit enzymes such as polyphenol oxidase. Sensitive populations include people with allergy to phenols, although this is rare. No interactions with medications are known. EFSA concluded in 2016 that there is no safety concern at current exposure levels, and WHO/JECFA established an ADI of 0.5 mg/kg.
In summary, it is considered safe for the general population when consumed within legal limits.
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