Overview
MAL-PEG2 is a heterobifunctional PEG linker critical in bioconjugation chemistry. Its maleimide group reacts selectively with thiols (-SH) in cysteine residues or other sulfhydryl-containing molecules, while the terminal hydroxyl group (PEG2) allows further derivatization. The short PEG spacer enhances water solubility without significantly increasing molecular size, making it ideal for modifying peptides, proteins, and nanoparticles. The compound is widely adopted in pharmaceutical R&D, particularly for constructing antibody-drug conjugates (ADCs) and targeted drug delivery systems. Its biocompatibility and controlled reactivity balance stability and conjugation efficiency, meeting stringent requirements for therapeutic applications.
Physical and Chemical Properties
MAL-PEG2 typically presents as a colorless viscous liquid or low-melting solid, depending on storage conditions and purity. Its molecular weight of 243.26 g/mol ensures minimal steric hindrance during conjugation. The maleimide group exhibits high specificity for thiols at pH 6.5–7.5, forming stable thioether bonds, while the PEG2 spacer (two ethylene glycol units) maintains hydrophilicity. Solubility in aqueous and organic solvents (e.g., DMSO, DMF) facilitates versatile reaction conditions. Stability is compromised by hydrolysis at high pH (>8.5) or prolonged exposure to moisture, necessitating anhydrous storage. Analytical methods like HPLC and NMR are used to confirm purity and structural integrity.
Main Applications
In drug development, MAL-PEG2 bridges therapeutic agents (e.g., cytotoxins) and targeting moieties (e.g., antibodies) to create ADCs with controlled drug-to-antibody ratios (DAR). Its role in site-specific conjugation minimizes heterogeneity, a key FDA requirement for ADC approvals. Beyond ADCs, it functionalizes surfaces for biosensors and nanoparticle drug carriers, where PEGylation reduces immunogenicity. Researchers also exploit its crosslinking capability to stabilize protein structures or immobilize enzymes. The hydroxyl group can be further activated for amine coupling, expanding its utility in multi-step bioconjugation workflows.
Safety and Storage
MAL-PEG2 requires careful handling due to the reactivity of its maleimide group. Use personal protective equipment (PPE) including nitrile gloves and safety goggles. Work in a well-ventilated fume hood to avoid inhalation of dust or vapors from dissolved samples. For long-term stability, store sealed containers under argon or nitrogen at -20°C, with desiccants to prevent moisture absorption. Avoid repeated freeze-thaw cycles. Degradation products (e.g., hydrolyzed maleimide) can be identified by color changes (yellowing) or loss of reactivity, necessitating periodic quality checks.
B2B Procurement Guide
When sourcing MAL-PEG2, prioritize suppliers with ISO 9001 certification and documented quality control procedures. Request certificates of analysis (CoA) specifying purity (≥95%), residual solvents, and endotoxin levels for biomedical applications. Bulk purchases (100g+) may reduce costs by 20–30%, but validate scalability through pilot batches. Custom modifications (e.g., isotope-labeled PEG2, different spacer lengths) are available from specialty manufacturers. Lead times vary; secure supply chain agreements to mitigate shortages, especially for GMP-grade material. Compare incoterms (e.g., DDP vs. EXW) to clarify logistics responsibilities.
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