Overview
PLL-P is a block copolymer composed of poly-L-lysine (PLL) and polyethylene glycol (PEG). It combines the cationic properties of PLL with the stealth characteristics of PEG, making it ideal for biomedical applications. The copolymer is synthesized via conjugation, yielding tunable ratios of PLL to PEG segments. Its versatility stems from PEG's ability to reduce protein adsorption and PLL's capacity to bind negatively charged surfaces. This dual functionality enables uses ranging from nanoparticle stabilization to biocompatible coatings for implants. Commercial grades vary in molecular weight and PEGylation density to suit specific needs.
Physical and Chemical Properties
PLL-P exhibits pH-dependent solubility due to the amine groups in PLL, which protonate under acidic conditions. The PEG segment enhances hydrophilicity, improving aqueous stability. Typical formulations are supplied as lyophilized powders or sterile solutions. Thermal stability is moderate, with decomposition occurring around 200°C. The copolymer is stable under physiological conditions but may degrade enzymatically over time. Analytical techniques like GPC and NMR are used to confirm molecular weight and composition.
Main Applications
In drug delivery, PLL-P forms micelles or coatings to enhance nanoparticle circulation time. Its PEG layer minimizes immune recognition, while PLL facilitates cargo binding. Examples include siRNA delivery and targeted cancer therapies. For tissue engineering, PLL-P modifies scaffold surfaces to promote cell adhesion without triggering inflammation. It is also used in biosensors to prevent nonspecific protein binding. Industrial applications include antifouling coatings for medical devices.
Safety and Storage
PLL-P is generally biocompatible but should be handled as a mild irritant. Use PPE to avoid skin contact or inhalation of powder. Storage at 2–8°C prolongs shelf life; solutions may require aliquoting to prevent freeze-thaw damage. Sterile variants are available for in vivo use. Always verify endotoxin levels for clinical applications. Disposal should follow local regulations for synthetic polymers.
B2B Procurement Guide
Bulk buyers should specify: 1) Molecular weight (PLL and PEG blocks), 2) PEGylation ratio, 3) Purity (e.g., >95%), and 4) Endotoxin limits if applicable. Custom synthesis is offered by some suppliers. Lead times vary; certified GMP-grade material requires longer procurement cycles. Compare COAs (Certificates of Analysis) across vendors. For reference, research-grade quantities (1–10 g) cost approximately $100–$300/g, while bulk orders may reduce prices by 20–30%.
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