Overview
Hydroxypropyl Beta-Cyclodextrin (HPBCD) is a derivative of β-cyclodextrin, modified by hydroxypropyl groups to enhance water solubility and biocompatibility. It belongs to the cyclodextrin family, cyclic oligosaccharides known for their ability to form inclusion complexes with hydrophobic molecules. HPBCD is widely used in industries requiring solubilization or stabilization of active compounds, such as pharmaceuticals and cosmetics. Its modification with hydroxypropyl groups reduces renal toxicity compared to unmodified β-cyclodextrin, making it safer for therapeutic applications. HPBCD is also biodegradable and non-immunogenic, further broadening its utility in drug formulations and other applications.
Physical and Chemical Properties
HPBCD is a white to off-white powder with high water solubility, a critical feature for its role in solubilizing poorly water-soluble drugs. Its molecular structure consists of a hydrophobic cavity and a hydrophilic exterior, enabling it to encapsulate hydrophobic guest molecules. The degree of substitution (DS) of hydroxypropyl groups typically ranges from 0.6 to 1.0 per glucose unit, influencing solubility and complexation efficiency. Unlike native β-cyclodextrin, HPBCD does not crystallize easily and remains amorphous, contributing to its superior solubility. It is stable under moderate temperatures and pH ranges (2–12), though prolonged exposure to extreme conditions may degrade the compound.
Main Applications
In pharmaceuticals, HPBCD is a key excipient for enhancing the solubility and bioavailability of hydrophobic drugs, such as antifungal agents and anticancer compounds. It is also used in oral, injectable, and topical formulations. The FDA has approved HPBCD for certain drug products, underscoring its safety profile. Beyond pharmaceuticals, HPBCD serves as a stabilizer in food and flavor industries, masking bitter tastes or protecting volatile compounds. In cosmetics, it improves the delivery of active ingredients like vitamins and fragrances. Research applications include its use as a chiral selector in chromatography and a tool for studying membrane interactions.
Safety and Storage
HPBCD is generally non-toxic and classified as GRAS for specific uses. However, dust inhalation should be avoided, and personal protective equipment (PPE) like gloves and masks is recommended during handling. Its low irritancy makes it suitable for topical applications, though excessive oral consumption may cause mild gastrointestinal effects. Storage requires protection from moisture and high temperatures. Sealed containers in dry environments below 25°C are ideal. Bulk quantities should be stored in palletized, moisture-proof packaging to prevent caking or degradation.
B2B Procurement Guide
When sourcing HPBCD, prioritize suppliers compliant with pharmacopeial standards (USP/EP) for pharmaceutical-grade material. Key specifications include substitution degree (DS), purity (>98%), and residual solvent levels. Technical data sheets (TDS) and certificates of analysis (CoA) are essential for quality verification. Prices vary by quantity and grade, with bulk purchases (100+ kg) often discounted. Sample testing is advisable to confirm compatibility with your application. For regulatory-sensitive industries, ensure suppliers provide documentation for REACH, FDA, or other regional compliance.
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