Ribonucleotides
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Description
The food additive E626, known as ribonucleotides, is a flavor enhancer used to enhance the umami taste in foods. It is a mixture of sodium or calcium salts of the nucleotides 5'-inosinate and 5'-guanylate, although it may also include 5'-adenylate.
Its origin is natural, as these nucleotides are naturally present in many foods such as meats, fish, and mushrooms. Industrially, it is obtained by microbial fermentation or by enzymatic hydrolysis of yeast RNA (Saccharomyces cerevisiae). Physicochemical properties include being white or slightly yellow powders, soluble in water, and heat-stable, allowing its use in processed foods. Its main function is to enhance umami flavor, acting synergistically with monosodium glutamate (E621) to intensify taste.
The history of its approval in the European Union dates back to Directive 95/2/EC, and it is currently regulated by Regulation (EC) 1333/2008. EFSA has evaluated its safety several times, most recently in 2019, establishing an Acceptable Daily Intake (ADI) of 120 mg/kg body weight per day for the sum of inosinate and guanylate. WHO, through JECFA, has also evaluated these additives and established a similar ADI.
Regarding food safety, it is considered safe at authorized doses, with no evidence of significant adverse effects. On labeling, it must appear as "ribonucleotides" or with its E number.
E626 is mainly used in processed foods to enhance umami flavor. Authorized food categories include snacks, soups, broths, sauces, processed meat products, seasonings, and prepared dishes. In the Spanish market, it is found in brands such as Lays (snacks), Gallina Blanca (soups and broths), and Carrefour (prepared dishes). Authorized limits under Regulation (EC) 1333/2008 vary by category: for example, in soups and broths up to 500 mg/kg, in snacks up to 500 mg/kg, and in sauces up to 500 mg/kg. In comparison with the FDA, in the United States ribonucleotides are generally recognized as safe (GRAS) and have no specific limits, although they are used in similar amounts. In Japan, their use is also permitted without specific restrictions. Synergy with monosodium glutamate allows reducing the total amount of flavor enhancers in foods.
Ribonucleotides (E626) have been evaluated by EFSA and JECFA, concluding that they do not present significant adverse effects at authorized doses. No side effects in humans have been documented with normal consumption.
In animal studies, very high doses (over 1000 mg/kg/day) have shown mild effects such as increased uric acid, but this is not relevant for human intake. The biological mechanism of nucleotides involves their metabolism to uric acid, but the amounts present in foods are too low to cause hyperuricemia in healthy individuals. Sensitive populations such as people with gout or kidney failure should consult a doctor, although there is no evidence of risk.
No interactions with medications are known. The conclusion of EFSA and WHO is that E626 is safe under authorized conditions of use.
- Disodium 5'-ribonucleotides
- Dicalcium 5'-ribonucleotides
- Disodium inosinate
- Disodium guanylate
- Mixture of inosinate and guanylate
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