Poly-L-Arginine (PArg)
Poly-L-Arginine for drug delivery, cell penetration and bioconjugation. Available in research and GMP grades with custom modifications
About the Poly-L-Arginine
Poly‑L‑arginine (pArg) is a highly cationic polypeptide composed of repeating L‑arginine units, giving it strong positive charge at physiological pH. This enables robust electrostatic interactions with nucleic acids, cell membranes, and other anionic biomolecules.
Its guanidinium‑rich side chains promote efficient membrane association and intracellular transport, making polyarginine a valuable excipient for enhancing cellular uptake and forming stable complexes with therapeutic payloads.
Beyond delivery applications, polyarginine shows antimicrobial and immunomodulatory activity, and certain chain lengths can support wound‑healing environments by reducing inflammation. These multifunctional properties make it useful not only in drug‑ and gene‑delivery systems but also as a functional component in biomaterials, hydrogels, and tissue‑engineering scaffolds.
Uses of Poly-L-Arginine
Gene Delivery
Poly-L-Arginine forms stable electrostatic complexes with DNA, mRNA, siRNA and other nucleic acids, enabling efficient intracellular delivery. Its high cationic charge makes it an excellent polymer for non‑viral gene‑delivery systems.
Drug Delivery Systems
Poly-L-Arginine is widely used in nanoparticles, hydrogels and polymer-based carriers to improve payload encapsulation, cellular uptake and controlled release. Its versatile chemistry supports the development of advanced therapeutic delivery platforms.
Cell-Penetrating Applications
Thanks to its guanidinium-rich structure, Poly-L-Arginine efficiently interacts with cell membranes, promoting intracellular transport of therapeutic payloads. It is widely used to enhance the cellular uptake of drugs, proteins and nucleic acids.
Biomaterials & Tissue Engineering
Poly-L-Arginine is incorporated into biomaterials, hydrogels and tissue-engineering scaffolds to improve cell interactions and support regenerative applications. Its antimicrobial and immunomodulatory properties also make it attractive for advanced biomedical materials.
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 :
- PArg-25
- PArg-50
- PArg-75
- PArg-100
- PArg-200
- Custom formats
Quality Levels
R&D Grade Polyarginine
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 Polyarginine
Designed to support medical device applications with enhanced quality documentation, traceability and regulatory support. Suitable for biomaterials, coatings and implantable device development.
GMP Grade Polyarginine
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-Arginine highly effective for intracellular delivery?
Poly-L-Arginine is a highly cationic polyamino acid used in gene delivery, drug delivery, cell-penetrating applications and biomaterials. Its guanidinium-rich side chains promote efficient cellular uptake, making it an ideal excipient for advanced therapeutic formulations.
Can Poly-L-Arginine be custom functionalized?
Yes. Poly-L-Arginine can be tailored with different molecular weights, functional groups and conjugation chemistries to support targeted delivery, bioconjugation and advanced drug delivery applications.
Is GMP-grade Poly-L-Arginine available?
Yes. Curapath offers GMP-grade Poly-L-Arginine manufactured under robust quality systems for clinical and commercial applications, together with research-grade and medical device-compliant quality levels.
How does Poly-L-Arginine compare with other polyamino acids?
Compared with other polyamino acids, Poly-L-Arginine provides exceptional membrane interaction and cellular uptake due to its guanidinium-rich side chains. These properties make it particularly suitable for intracellular delivery while complementing polymers such as Poly-L-Lysine and Polyglutamic Acid for different therapeutic applications.
Why choose Curapath as your Poly-L-Arginine supplier?
Curapath combines custom polymer synthesis, functionalization, analytical characterization and GMP manufacturing under one CDMO. We support Poly-L-Arginine projects from early development through clinical and commercial supply.
