Poly-L-Lysine (PLL)
Poly-L-Lysine for advanced therapeutics and medical devices.
GMP available, scalable manufacturing and custom functionalization
About the Poly-L-Lysine
Poly‑L‑lysine is a cationic polypeptide composed of repeating L‑lysine residues linked through peptide bonds, which gives the polymer a strong positive charge at physiological pH.
This cationic backbone enables intense electrostatic interactions with negatively charged biomolecules such as nucleic acids, cell membranes, and anionic polymers. PLL is biodegradable, biocompatible, and enzymatically degradable into natural lysine, making it suitable for biomedical applications.
Its high charge density allows it to form uniform, adhesive coatings and to condense nucleic acids into compact complexes, which is why it is widely used in drug‑delivery and also has proven antibacterial propierties in biomaterials.
Uses of Poly-L-Lysine
Drug conjugation
Poly-L-Lysine enables the conjugation of small molecules, peptides, proteins, antibodies and targeting ligands through its multiple reactive amine groups. This versatile platform supports the development of drug conjugates with enhanced stability, targeting capabilities and therapeutic performance.
Gene‑delivery vectors
Its cationic backbone efficiently condenses DNA and RNA into compact polyplexes, improving cellular uptake and supporting non‑viral gene‑delivery strategies.
Gene Editing Therapies
Poly-L-Lysine is a versatile material for the development of nanoparticles, hydrogels and other drug delivery systems. Its tunable properties support efficient payload loading, controlled release and targeted delivery, enabling the design of advanced therapeutic formulations.
Medical Devices & Tissue Engineering
Poly-L-Lysine is widely used in medical devices and tissue engineering to functionalize surfaces and enhance cell interactions. It is incorporated into coatings, hydrogels and biomaterials for implants, regenerative medicine and other advanced biomedical applications.
Formats Available
Degree of polymerization
In curapath we have a deep control over the polymerization, being able to achive a wide range of molecular weights, our standar offer includes :
- PLL-70
- PLL-100
- PLL-200
- PLL-300
- PLL-400
- Custom formats
Quality Levels
R&D Grade Polylysine
Ideal for early-stage research, formulation development and proof-of-concept studies. Manufactured under rigorous quality standards with comprehensive analytical characterization for reproducible research.
Medical Device Grade Polylysine
Designed to support medical device applications with enhanced quality documentation, traceability and regulatory support. Suitable for biomaterials, coatings and implantable device development.
GMP Grade Polylysine
Manufactured under GMP conditions for clinical and commercial applications. Supported by validated quality systems, batch traceability, regulatory documentation and scalable production.
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Frequently asked questions (FAQs)
What is Curapath
Curapath is a European Contract Development and Manufacturing Organization (CDMO) specialized in non-viral drug delivery systems. We support biotech and pharmaceutical companies from early development through GMP-ready and commercial manufacturing, combining proprietary delivery components, in-house technologies, and deep expertise in complex formulation and CMC development.
Why is Poly-L-Lysine widely used for drug conjugation?
Poly-L-Lysine contains multiple reactive amine groups that can be functionalized using a broad range of chemistries. It can be conjugated to small molecules, peptides, proteins, antibodies, oligonucleotides, imaging agents and targeting ligands, making it an ideal polymer backbone for multifunctional therapeutics.
Can Poly-L-Lysine be custom functionalized?
Yes. Poly-L-Lysine can be modified with a wide variety of functional groups to enable bioconjugation, targeted delivery or surface immobilization. Examples include fluorescent labels, PEG derivatives, clickable groups, targeting ligands and other application-specific chemistries.
Is GMP-grade Poly-L-Lysine available?
Yes. Curapath offers GMP-grade Poly-L-Lysine manufactured under robust quality systems for clinical and commercial applications. Additional quality levels are also available for research and medical device development.
We also have off-the-shelf GMP Poly-L-Lysine available, you can check wich options are directly available here
How does Poly-L-Lysine compare with other polyamino acids?
Poly-L-Lysine offers high functionalization capacity due to its multiple primary amine groups, making it particularly suitable for drug conjugation and nucleic acid delivery. Other polyamino acids, such as polyarginine, polysarcosine or polyglutamic acid, provide complementary properties depending on the desired biological performance and therapeutic application.
Why choose Curapath as your Poly-L-Lysine supplier?
Curapath combines polymer synthesis, custom functionalization, bioconjugation expertise and GMP manufacturing under one CDMO. From research-grade materials to clinical supply, we support the complete development lifecycle of Poly-L-Lysine-based therapeutics and biomaterials.
