Sodium Gluconate: An Efficient, Biodegradable Chelating Agent

CAS Registry Number: 527-07-1

Overview

Sodium gluconate is the sodium salt of gluconic acid, with the chemical formula C₆H₁₁NaO₇ and a molecular weight of 218.14 g/mol. It appears as a white crystalline powder or granules, readily soluble in water, odorless with a slight characteristic taste. Its core property lies in its excellent chelating ability, effectively binding divalent and trivalent metal ions such as calcium and iron, making it widely applicable across various industrial sectors. As a derivative of gluconic acid, it is primarily produced through a simple fermentation process from glucose.

Major Applications

Leveraging its chelating and mild properties, sodium gluconate finds extensive use across multiple fields:

Pharmaceutical and Biotechnology

• Injectable Excipient: Used as a high-purity, low-endotoxin excipient in large-volume parenterals (LVP) and biologics, serving as an electrolyte replenisher (providing sodium ions) and pH buffer to ensure formulation stability and safety.

• Cell Culture Media: In biological research, it can act as a chelating agent to control metal ion-catalyzed reactions.

Construction Materials

• Concrete Admixture: Functions as an effective set retarder and water reducer, significantly extending the setting time of concrete, improving workability, and effectively enhancing later-stage strength (data shows a 13% increase in 90-day compressive strength).

Food Industry

• Quality Improver: Used as an acidity regulator, chelating agent, and flavor enhancer. It improves taste (studies indicate it can replace 75% of sodium without compromising dough performance) while preventing oxidative spoilage of food by chelating metal ions.

Personal Care and Cosmetics

• Cosmetics and Personal Care: Acts as a mild chelating agent to prevent metal ions from affecting product stability; serves as a humectant to retain moisture; and is used to adjust product pH.

Industrial Cleaning and Metal Treatment

• Eco-Friendly Chelating Agent: In metal surface treatment, textile dyeing, and industrial cleaning, it serves as a biodegradable chelating agent, replacing traditional EDTA and phosphates for descaling and rust removal.

Environmental Benefits

A significant advantage of sodium gluconate is its environmental friendliness. It is non-toxic and readily biodegradable, with data showing a biodegradation rate of up to 98% within 2 days in the environment, making it a green and sustainable chemical raw material.

Safety and Handling

• Hazard Classification: According to the International Chemical Safety Cards (ICSC) and certain Safety Data Sheets, it is not classified as a GHS hazardous substance under normal use. However, some suppliers classify it as an irritant, potentially causing skin and eye irritation.

• Handling Precautions: Recommended to wear protective gloves and goggles, and avoid inhaling dust during handling.

• Storage Conditions: Should be stored in sealed containers in a cool, dry, well-ventilated area, away from strong oxidizers.

• Environmental Impact: Although slightly corrosive to metals, it is considered safe for humans with no evidence of carcinogenicity or reproductive toxicity.

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