Overview
Poloxamer (Excipient Grade) is a synthetic block copolymer of polyethylene oxide (PEO) and polypropylene oxide (PPO), known for its amphiphilic properties. It is widely used as a solubilizer, stabilizer, and emulsifier in pharmaceuticals, cosmetics, and industrial formulations. The excipient grade ensures compliance with stringent purity standards for medical and cosmetic applications. Poloxamers are classified by their PEO/PPO ratio and molecular weight, denoted by numeric suffixes (e.g., Poloxamer 188, 407). These variations tailor the material’s solubility, gelling temperature, and surfactant activity, making it versatile for diverse formulations.
Physical and Chemical Properties
Poloxamers exhibit reversible thermal gelation, forming gels at body temperature while remaining liquid at room temperature. This property is critical for drug delivery systems like ophthalmic solutions and injectable depots. Their hydrophilic-lipophilic balance (HLB) ranges from 1 to 30, enabling compatibility with both water-soluble and lipid-based compounds. The polymers are chemically stable under normal conditions but may degrade under prolonged exposure to high temperatures or strong oxidizers. Solubility in polar solvents like water and ethanol makes them easy to incorporate into aqueous or semi-solid formulations.
Main Applications
In pharmaceuticals, poloxamers enhance drug solubility (e.g., for poorly water-soluble APIs) and stabilize emulsions in topical creams. They are key in controlled-release systems, such as thermosensitive gels for localized drug delivery. Cosmetic formulations leverage their emulsifying properties in lotions and shampoos. Industrially, poloxamers serve as wetting agents in coatings and dispersants for agrochemicals. Their low toxicity and biodegradability also support applications in biomedical research, such as cell culture and tissue engineering scaffolds.
Safety and Storage
Poloxamers are non-toxic and non-irritating at standard concentrations, complying with USP/EP/JP pharmacopeias for excipient use. However, dust inhalation should be avoided during handling. Long-term storage requires protection from moisture and high humidity to prevent caking. For lab or production use, poloxamers should be stored in tightly sealed containers at room temperature. Stability studies indicate no significant degradation under recommended conditions for up to 3 years.
B2B Procurement Guide
When sourcing excipient-grade poloxamers, prioritize suppliers with GMP certification and batch-specific COAs (Certificates of Analysis). Key specifications include molecular weight, PEO/PPO ratio, and residual solvent levels. Bulk buyers should negotiate pricing for quantities above 100 kg, with discounts of 10–20% common for pharmaceutical-grade orders. Audit suppliers for compliance with ISO 13485 or equivalent standards if the material is for medical devices. Sample testing for critical parameters like cloud point and HLB is recommended before large-scale procurement.
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