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Poly-D-lysine hydrobromide

mol wt 70,000-150,000

Linear Formula:
D-Lys-(D-Lys)n-D-Lys · xHBr
CAS Number:
MDL number:
PubChem Substance ID:

Quality Level



mol wt



cell culture | mammalian: suitable


white to off-white

storage temp.


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InChI key


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Poly-D-lysine hydrobromide is used for the following applications:
  • Used in animal cell culture
  • Rat cortical neuron cultures
  • Cell culture and siRNA treatment
  • Primary cell cultures and adult neuronal network model
  • Cortical astrocyte culture
  • Immunofluorescence staining (HDF cells were plated onto poly-D lysine (P0899, Sigma-Aldrich) coated glass coverslips)
  • NPC collection and culture conditions
Poly-D-lysine polymers can be used in preparing surfaces for cell attachment. The D-lysine polymers can also be used with cells that digest poly-L-lysine polymers and cause an excessive uptake of L-lysine.

This product is recommended as a cell culture substratum when using 0.5 - 1.0 mL of a 0.1 mg/mL solution to coat 25 cm2. Lower molecular weight versions of the product are less viscous, but high more molecular weight versions provide more attachment sites per molecule.


10 mg in glass bottle
50, 100, 500 mg in poly bottle
1 g in poly bottle

Biochem/physiol Actions

This product is a nonspecific attachment factor for cells useful in promoting cell adhesion to solid substrates by enhancing electrostatic interaction between negatively charged ions of the cell membrane and the culture surface. After absorption to the culture surface, poly-D-lysine increases the number of positively charged cell binding sites.


Poly-D-lysine is a positively charged amino acid polymer with approximately one HBr per lysine residue. The hydrobromide allows the poly-D-lysine to be in a crystalline form soluble in water. A small amount of product may be found in the ß structure because the HBr interferes with hydrogen bonding between amino and either the carboxyl groups or N or O containing moieties.


Sterile solutions are stable for up to 2 years when stored at 2-8°C. It should be stored desiccated at -20°C.

Analysis Note

This product has a molecular weight of 70,000-150,000. To remove the HBr, dissolve this product in a neutral buffer and dialyze to remove the salts. In general, to use this product as an attachment factor, add 50 mL of sterile tissue culture grade water to 5 mg of poly-lysine, and aseptically coat the surface with 1 mL per 25 cm2 of solution. After 5 minutes, remove the solution through aspiration and thoroughly rinse the surface. Let dry for two hours before introducing cells and medium.

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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Poly(Amino Acid) Block Copolymers for Drug Delivery and other Biomedical Applications

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