Fractogel EMD COO⁻ (M)

Weak cation exchange Fractogel^® resin featuring the tentacle technology, efficient for difficult aggregate removal

Fractogel^® EMD COO^- (M) enables:

• Good resolution between monomers and aggregates
• Efficient aggregate and HCP removal combined with high yield
• Compatibility with 2.5 % (v/v) aqueous benzyl alcohol containing 150 mM NaCl storage solution

Due to the titration behavior, the ion exchange capacity can be used from pH 6 to pH 12. The separation of proteins is based on reversible electrostatic interactions between the negatively charged regions of the proteins′ surface and the support. Proteins are retained efficiently on Fractogel^® EMD COO^- (M) when the pH of the buffer is about 1 unit below their isoelectric points (pl).

The strength of the binding depends on the following:

• the buffer system
• pH value of the buffer which determines the surface charge of the protein
• the degree of the ionization of the functional groups of the exchanger
• the concentration of the counter ions
• the charge density on the support (protein binding capacity)

Plastic bottle

Appearance: Milky turbid suspension,free from impurities(foreign particles)
Microscopic evaluation: Uniform spherical particles,no agglomerates,no fines
Extractable matter (water): ≤ 0.05 %
Cerium: ≤ 10 µg/g
Pressure drop(column: ID=1.6 cm, L=10 cm at 5 ml/min): ≤ 1.0 bar
Particle size (d10): 37 - 45 µm
Particle size (d50): 48 - 60 µm
Particle size (d90): 63 - 77 µm
Colony forming units (TAMC + TYMC): ≤ 100 CFU/ml
Endotoxins: ≤ 1.00 EU/ml
Protein binding capacity (lysozyme): 80 - 120 mg/ml
Functional test (b:a): ≤ 0.30
Functional test (c:d): ≤ 0.70
Functional test: Separation of chymotrypsinogen A, cytochrome C and lysozyme

FRACTOGEL is a registered trademark of Merck KGaA, Darmstadt, Germany