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E577 Potassium Gluconate – Food Additive

E577 is the EU food additive potassium gluconate, a salt of gluconic acid. It is used as a sequestrant and stabiliser in food products.

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Things worth knowing about "E577"

E577 is the EU food additive potassium gluconate, a salt of gluconic acid. It is used as a sequestrant and stabiliser in food products.

What is E577 (Potassium Gluconate)?

E577 refers to the food additive potassium gluconate, the potassium salt of gluconic acid. It is a naturally occurring organic compound that can be produced through the fermentation of glucose. Potassium gluconate appears as a white to slightly yellowish crystalline or powdered solid and is readily soluble in water.

Function and Use in Food

In the food industry, E577 is primarily used as a sequestrant (chelating agent) and stabiliser. Sequestrants bind free metal ions such as calcium, magnesium, or iron within food products, thereby preventing unwanted chemical reactions such as oxidation, discolouration, or flavour changes. This extends the shelf life and maintains the quality of food products.

Stabilisation of food colours and flavours
Prevention of unwanted mineral salt precipitation
Use in beverages, desserts, and processed foods
Application as a source of potassium in dietary supplements

Chemical Properties

Potassium gluconate has the chemical formula C₆H₁₁KO₇ and a molecular weight of approximately 234.25 g/mol. It is highly soluble in water and stable under normal storage and processing conditions. The compound is non-volatile and odourless.

Safety and Health Assessment

E577 is considered safe for use in food. The European Food Safety Authority (EFSA) and the Joint FAO/WHO Expert Committee on Food Additives (JECFA) have both evaluated potassium gluconate. No specific ADI (Acceptable Daily Intake) value has been established for E577, as it is classified as substantially harmless under normal conditions of use.

Potassium gluconate is metabolised in the body into gluconate and potassium ions. Gluconate is excreted via the kidneys, while potassium, as an essential mineral, is utilised by the body. No adverse health effects are known at the amounts typically ingested through food.

People with Kidney Disease

Individuals with impaired kidney function should monitor their potassium intake, as the body may not be able to excrete potassium efficiently in cases of kidney disease. Elevated potassium levels in the blood (hyperkalaemia) can pose health risks in such circumstances.

Approval and Labelling

In the European Union, E577 is authorised under Regulation (EC) No 1333/2008 on food additives. It may be used in specific food categories in technologically necessary amounts. On the ingredient list of processed products, the substance is declared either as E577 or as potassium gluconate.

Related Food Additives

Potassium gluconate belongs to the group of gluconates, all of which can act as sequestrants. Related compounds include:

E574 - Gluconic acid
E575 - Glucono delta-lactone
E576 - Sodium gluconate
E578 - Calcium gluconate
E579 - Ferrous gluconate

References

European Food Safety Authority (EFSA): Re-evaluation of glucono-delta-lactone (E 575), glucono delta-lactone sodium salt (E 576), gluconate potassium salt (E 577) and gluconate calcium salt (E 578) as food additives. EFSA Journal, 2013.
FAO/WHO Joint Expert Committee on Food Additives (JECFA): Monograph on Potassium Gluconate. WHO Food Additives Series.
European Parliament and Council: Regulation (EC) No 1333/2008 on food additives. Official Journal of the European Union, 2008.

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