Overview
Sodium starch glycolate is a modified carbohydrate polymer derived from potato, corn, or wheat starch through carboxymethylation. As a pharmaceutical excipient, it was first introduced in the 1970s and has since become one of the most widely used superdisintegrants in solid dosage formulations. The material is approved by major pharmacopeias including USP, EP, and JP. The compound's primary function is to promote rapid tablet disintegration in aqueous environments, typically at concentrations of 2-8% w/w in formulations. Its effectiveness stems from rapid water uptake and swelling properties, which create disruptive forces within the tablet matrix. Pharmaceutical manufacturers value its consistency, compatibility with most active ingredients, and ability to improve drug dissolution rates.
Physical and Chemical Properties
Sodium starch glycolate appears as a white, odorless, free-flowing powder with particle sizes typically ranging from 30-100 μm. The degree of substitution (DS) usually falls between 0.2-0.3, indicating that 20-30% of glucose units bear carboxymethyl groups. This modification significantly enhances water absorption capacity compared to native starch. When exposed to water or gastrointestinal fluids, the particles swell 4-8 times their original volume within seconds through a combination of capillary action and ionic repulsion between carboxylate groups. The material shows optimal performance at neutral to slightly alkaline pH, though it remains effective across a broad pH range (3-10). Thermal gravimetric analysis typically shows decomposition beginning around 200°C.
Main Applications
In pharmaceuticals, sodium starch glycolate serves as the disintegrant in approximately 70% of immediate-release oral tablets. It's particularly valuable for poorly soluble drugs requiring rapid dissolution, such as analgesics, antihistamines, and cardiovascular medications. The excipient also finds use in orally disintegrating tablets (ODTs) and controlled-release formulations where initial burst release is desired. Beyond pharmaceuticals, food-grade variants act as thickeners and stabilizers in processed foods. Industrial applications include use in adhesives, textiles, and paper products where modified starch properties are beneficial. The material's biodegradability makes it environmentally preferable to synthetic alternatives in many applications.
Safety and Storage
Regarded as non-toxic and non-irritating, sodium starch glycolate carries GRAS status for food use and is approved worldwide for pharmaceutical applications. The LD50 in rats exceeds 5,000 mg/kg body weight. No significant safety concerns exist when handling the powder, though standard precautions against dust inhalation should be observed in industrial settings. Proper storage requires protection from humidity (recommended RH <60%) at 15-25°C in sealed containers. Bulk material may develop lumps if exposed to moist air, though this doesn't typically affect functionality if properly milled before use. The shelf life is generally 3-5 years when stored correctly, with no special disposal requirements.
B2B Procurement Guide
Pharmaceutical buyers should specify compendial grade (USP/EP/JP) with appropriate documentation including Certificate of Analysis, DMF references, and allergen statements (particularly for wheat-derived products). Key quality parameters include swelling volume (≥40 ml/g), pH (5.5-7.5), and microbial limits (<1000 CFU/g). For large-scale procurement (ton quantities), prices typically range $15-25/kg with volume discounts. Food-grade material costs approximately 30-50% less. Lead times vary from 2-8 weeks depending on grade and quantity. Reliable suppliers include JRS Pharma, DFE Pharma, and Mingtai Chemical. Always audit suppliers for GMP compliance and request stability data for your specific formulation conditions.
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