Description:
Recombinant Human IL-8 produced in E.Coli is a single, non-glycosylated polypeptide chain containing 77 amino acids and having a molecular mass of 8904 Dalton. The rHuIL-8 is purified by proprietary chromatographic techniques.

Source:
Escherichia Coli.

Formulation:
Lyophilized from a concentrated (1mg/ml) solution in water containing no additives.

Solubility:
It is recommended to reconstitute the lyophilized rHuIL-8 in sterile 18MΩ-cm H2O not less than 100µg/ml, which can then be further diluted to other aqueous solutions.

Stability:
Lyophilized rHuIL-8 although stable at room temperature for 3 weeks, should be stored desiccated below -18C. Upon reconstitution rHuIL-8 should be stored at 4C between 2-7 days and for future use below -18C. For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA). Please prevent freeze-thaw cycles.

Purity:
Greater than 98.0% as determined by:
(a) Analysis by RP-HPLC.
(b) Anion-exchange FPLC.
(c) Analysis by reducing and non-reducing SDS-PAGE Silver Stained gel.

Amino acid sequence:
The sequence of the first five N-terminal amino acids was determined and was found to be Ser-Ala-Lys-Glu-Leu.

Dimers and aggregates:
Less than 1% as determined by silver-stained SDS-PAGE gel analysis.

Biological Activity:
Fully biologically active when compared to standard.
Specific Activity of IL-8 in chemotaxis of donor PBL neutrophils, threshold concentration corresponding to 25-150ng/ml.

Endotoxin:
Less than 0.1 ng/µg (IEU/µg) of rHuIL-8.

Protein content:
Protein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280 nm.
2. Analysis by RP-HPLC, using a standard solution of IL-8 as a Reference Standard.