Sodium Ascorbate[2]
Overview
Sodium Ascorbate is the sodium salt of ascorbic acid (vitamin C), offering identical vitamin activity while being less acidic than pure ascorbic acid. This makes it particularly valuable in applications where pH neutrality is desired. First synthesized in the 1930s, it combines the antioxidant properties of vitamin C with improved solubility and stability. The compound is manufactured through a neutralization reaction between ascorbic acid and sodium bicarbonate or sodium carbonate, followed by crystallization.
Physical and Chemical Properties
As a crystalline powder, Sodium Ascorbate exhibits excellent water solubility - approximately 15 times greater than ascorbic acid itself. The solution pH typically ranges between 7.0-8.0 (1% solution), making it suitable for pH-sensitive formulations. The antioxidant mechanism involves donating electrons to neutralize free radicals. Unlike some antioxidants, it doesn't produce harmful byproducts during this process. Thermal decomposition begins around 218°C, with complete degradation occurring at higher temperatures.
Main Applications
In the food industry, Sodium Ascorbate (E301) serves multiple functions: preventing oxidation in meats and beverages, enhancing flour quality in baked goods, and preserving color in fruits and vegetables. Its neutral pH makes it preferable to ascorbic acid in dairy products. The pharmaceutical industry utilizes it in vitamin supplements, particularly for individuals who experience gastric irritation from acidic ascorbic acid. Topical formulations benefit from its antioxidant properties in skincare products, where it helps combat oxidative stress and supports collagen synthesis.
Safety and Storage
Classified as GRAS by FDA and approved by EFSA, Sodium Ascorbate has an established safety profile. The WHO acceptable daily intake is up to 15 mg/kg body weight, though higher doses are commonly used therapeutically under medical supervision. Proper storage is crucial for maintaining stability. The powder should be kept in tightly sealed containers with desiccants, protected from light and humidity. Bulk storage areas should maintain temperatures below 25°C and relative humidity below 65% to prevent caking and degradation.
B2B Procurement Guide
Industrial buyers should specify the required grade (food, pharmaceutical, or technical) and request documentation verifying compliance with relevant pharmacopeia standards (USP, BP, EP) or food chemical codes (FCC). Key quality parameters include assay (typically 99.0-101.0%), heavy metal content (<10 ppm), and microbial limits. For international shipments, verify whether the supplier can provide temperature-controlled transportation if required. Many manufacturers offer both standard and customized particle size distributions to suit specific application needs.
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