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Ferrous gluconate is also used as a food additive when processing black olives. It is represented by the food labeling E number E579 in Europe. It imparts a uniform jet black color to the olives
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Ferrous gluconate or iron (II) gluconate, with iron in the +2 oxidation state, can be used as an iron supplement in food, a color additive for ripe olives, also for the treatment of iron deficiency anemia in medical uses. The European food additive number for it is E579.

http://www.chinafooding.com/Ferrous_Gluconate

Sodium gluconate non-toxic. Present in water and sodium gluconate chelate formation with heavy metal ions, through the normal biological treatment quickly and completely degraded. Released during the degradation of the heavy metal ions can be removed by precipitation, or adsorption on the wastewater treatment process on the formation of sludge is removed.

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Sodium gluconate or sodium d-gluconate, the sodium salt of gluconic acid with the European food additive number E576, is different with other gluconates that can be used as a nutrient, this ingredient is mainly used as a chelating agent and cleaner in food and industrial uses.

http://www.chinafooding.com/Sodium_Gluconate

Sodium citrates used in ice cream, to prevent fat globules from sticking together. Citrate and phosphate, have this property. Sodium citrates is also an anticoagulant. E331 as a buffer, Sodium citrates help keep the pH level of soft drinks. Sodium citrates as a chelating agent, Sodium citrates the importance of calcium in the water, let them interfere with detergent and soap.
http://www.chinafooding.com/Sodium_citrates