What is sodium gluconate used for?

Chemical compound

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Sodium gluconate is a compound with formula NaC6H11O7.[2] It is the sodium salt of gluconic acid. Its E number is E576. This white, water-soluble powder has a wide range of applications across industries. Originally derived from gluconic acid in the 19th century, Sodium Gluconate is known for its chelating properties and is utilized as a chelating agent in various processes. It finds applications in textile, metal surface treatment, cement, and more. Moreover, its non-toxic nature and biodegradability contribute to its use in environmentally conscious practices.

Production

Sodium Gluconate can be produced through the fermentation process or chemical synthesis.[3] In the fermentation process, glucose is fermented by certain microorganisms, typically strains of Aspergillus niger or Pseudomonas. Gluconic acid is the primary product of this fermentation, and Sodium Gluconate is derived by neutralizing gluconic acid with sodium hydroxide.

Source of Gluconic Acid: The production of Sodium Gluconate commences with its precursor, gluconic acid. This organic acid is often obtained through a fermentation process. Glucose, or other sugar sources, serves as the substrate for microorganisms, typically bacteria or fungi, to produce gluconic acid.

Conversion to Sodium Gluconate: Once gluconic acid is harvested, it undergoes a transformation into Sodium Gluconate. The conversion primarily involves a chemical reaction where gluconic acid is neutralized with sodium hydroxide (NaOH). This reaction results in the formation of Sodium Gluconate, where the sodium ions (Na+) replace the hydrogen ions (H+) in gluconic acid.

Purification and Crystallization: Purification often includes filtration and chemical treatments to achieve the desired level of purity. Following purification, the solution is subjected to crystallization.

Drying and Packaging: After crystallization, the Sodium Gluconate crystals still contain residual moisture. Drying may involve processes like air drying or spray drying.

Applications

Sodium Gluconate's early uses were primarily in medicine due to its mild and non-toxic properties. Over time, its applications expanded to various industries, including food, pharmaceuticals, construction, textiles, and more, as its versatile properties and safety profile became more widely recognized.

Food Industry: Sodium Gluconate is used as a food additive for various purposes, including as a sequestrant to prevent metal ions from affecting the color, flavor, or stability of food products.

Construction: Sodium Gluconate is employed in the construction industry as a concrete admixture. It acts as a water reducer and retarder, enhancing the workability and performance of concrete.

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Textiles: In textile dyeing and printing, it is utilized as a chelating agent to improve color fastness.

Metallurgy: Sodium Gluconate is employed for metal surface treatment and cleaning, particularly for steel surfaces.

Cleaning Products: It can be found in cleaning agents for glass bottles and as a chelating agent in various cleaning formulations.

Safety and Regulation

Sodium Gluconate is generally recognized as safe (GRAS) for consumption by regulatory authorities such as the U.S. Food and Drug Administration (FDA). It is considered non-toxic and safe for use in food and pharmaceuticals.

Environmental Impact

Sodium Gluconate is known for its biodegradability,[4] which means it can break down naturally in the environment. It is considered environmentally friendly.

References

Sodium gluconate is the sodium salt of gluconic acid, produced by fermentation of glucose. It is a white to tan, granular to fine, crystalline powder, very soluble in water. Non corrosive, non-toxic and readily biodegradable (98 % after 2 days), sodium gluconate is more and more appreciated as chelating agent.

The outstanding property of sodium gluconate is its excellent chelating power, especially in alkaline and concentrated alkaline solutions. It forms stable chelates with calcium, iron, copper, aluminium and other heavy metals, and in this respect, it surpasses all other chelating agents, such as EDTA, NTA and related compounds.

Aqueous solutions of sodium gluconate are resistant to oxidation and reduction, even at high temperatures. However, it is easily degraded biologically (98 % after 2 days), and thus presents no wastewater problem.

Sodium gluconate is also a highly efficient set retarder and a good plasticiser / water reducer for concrete, mortar and gypsum.

And last but not least, it has the property to inhibit bitterness in foodstuffs.

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