Overview
Poly-L-lysine (PLL) is a linear homopolymer of the amino acid L-lysine, synthesized via bacterial fermentation or chemical polymerization. Its primary structure consists of repeated lysine units linked by peptide bonds, resulting in a positively charged polymer at physiological pH. This cationic nature underpins its utility in biomedical and industrial applications. First developed in the 1970s, PLL has become a staple in laboratories for cell adhesion promotion due to its ability to bind negatively charged surfaces like glass or plastics. It is available in varying molecular weights (1–300 kDa), with lower weights used for coatings and higher weights for drug delivery systems.
Physical and Chemical Properties
PLL is hygroscopic and typically supplied as a lyophilized powder or aqueous solution. Its solubility in water is pH-dependent, with optimal dissolution in slightly acidic conditions. The polymer’s charge density (one positive charge per lysine residue at neutral pH) enables electrostatic interactions with DNA, cell membranes, and other anionic substrates. Thermal stability is limited; PLL degrades at temperatures above 150°C. It is stable under sterile conditions but susceptible to microbial contamination in solutions. UV absorbance peaks at 215 nm, a property exploited for concentration quantification.
Main Applications
In cell culture, PLL coats surfaces to enhance attachment of primary cells (e.g., neurons, hepatocytes) by mimicking extracellular matrix proteins. It is also used in transfection protocols to complex with DNA, improving gene delivery efficiency. Beyond research, PLL serves as a natural preservative (Epsilon-Poly-L-lysine, ε-PL) in food packaging due to its antimicrobial properties. Emerging applications include biodegradable films, wound dressings, and as a dispersant in nanomaterial synthesis.
Safety and Storage
PLL is generally recognized as safe (GRAS) for food and biomedical use at low concentrations. Powder forms may cause respiratory irritation; handle with PPE in ventilated areas. Solutions should be filter-sterilized (0.22 µm) and stored at 2–8°C to prevent degradation. Long-term storage requires desiccation to avoid hydrolysis. Dispose of waste according to local regulations for organic compounds. Material Safety Data Sheets (MSDS) should be consulted for specific handling protocols.
B2B Procurement Guide
Key specifications for procurement include molecular weight (e.g., 15–30 kDa for cell culture), purity (≥95% by HPLC), and endotoxin levels (<0.1 EU/mg for sensitive applications). Bulk buyers should request certificates of analysis (CoA) and consider GMP-grade options for clinical use. Suppliers often provide customized formulations (e.g., sterile solutions at 0.01–1.0 mg/mL). Compare lead times and minimum order quantities (MOQs), as some manufacturers require 4–6 weeks for large-scale production.
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