Sorbitol is a sugar alcohol (polyol) commonly used as a sweetening agent, humectant, and excipient in pharmaceutical, cosmetic, and food products. It is derived from the reduction of glucose, and is known for its non-cariogenic and low-glycemic properties. Sorbitol is used both orally and topically, and is available in solid (crystalline) and liquid (syrup) forms.
It serves various roles including as a tablet binder, plasticizer, bulking agent, and laxative in higher doses.
Therapeutic and industrial uses include:
• Sweetener in sugar-free formulations (chewables, syrups, lozenges)
• Osmotic laxative in oral or rectal formulations
• Moisturizer and softener in topical products
• Stabilizer in liquid oral medications
• Excipient in injectable formulations
Parent: Mycophenolate Mofetil
Impurities in sorbitol arise from raw material quality, hydrogenation of glucose, and post-processing degradation. Being a hygroscopic and chemically reactive polyol, sorbitol is susceptible to microbial contamination and degradation under heat or prolonged storage. Impurities must be controlled per ICH Q3A/B, USP, EP, and food-grade specifications if applicable.
Process-Related Impurities
• Residual sugars such as glucose, mannitol, and fructose
• Incomplete hydrogenation products (e.g., sorbitan, reduced oligosaccharides)
• Residual nickel or other metals used as hydrogenation catalysts
• Residual solvents like isopropanol or ethanol (if used in crystallization or purification)
Degradation Impurities
• Oxidation products such as formic acid, acetic acid, or aldehydes
• Microbial by-products in aqueous solutions (e.g., endotoxins, organic acids)
• Maillard reaction products when exposed to amines or heat
• pH shifts or fermentation products upon improper storage
Elemental Impurities
• Trace levels of nickel, iron, lead, or copper from manufacturing or storage vessels
• Controlled under ICH Q3D for pharmaceutical excipients
Analytical Techniques for Impurity Detection
Sorbitol is used as a sweetener, laxative, humectant, and excipient in pharmaceutical and food products.
Yes, sorbitol has a low glycemic index and is suitable for diabetics in moderate amounts, though excessive intake may cause bloating or diarrhea.
It is produced by catalytic hydrogenation of glucose derived from starch hydrolysates.
Store in a tightly sealed container, protected from moisture and microbial contamination. Aqueous solutions should be refrigerated and used within their shelf life.
