Epidermal Growth Factor (Leu-21) Human Recombinant
EGF 21-Leu Human Recombinant produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 53 amino acids and having a molecular mass of 6205 Dalton.
The EGF 21-Leu is purified by proprietary chromatographic techniques.
Accession
Amino acid sequence
The sequence of the first five N-terminal amino acids was determined and was found to be Asn-Ser-Asp-Ser-Glu.
Biological Activity
The ED50, calculated by the dose-dependant proliferation of MDCK cells is < 10ng/ml concentration corresponding to a Specific Activity of 100,000IU/mg.
Formulation
The protein was lyophilized from a concentrated (1mg/ml) solution with no additives.
Physical Appearance
Sterile Filtered White lyophilized (freeze-dried) powder.
Protein content
Protein quantitation was carried out by two independent methods:1. UV spectroscopy at 280 nm using the absorbency value of 2.85 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a calibrated solution of EGF as a Reference Standard.
Purity
Greater than 98.0% as determined by:
(a) Analysis by RP-HPLC.
(b) Analysis by SDS-PAGE.
Solubility
It is recommended to reconstitute the lyophilized Epidermal Growth Factor 21-Leu in sterile 18MΩ-cm H2O not less than 100ug/ml, which can then be further diluted to other aqueous solutions.
Source
Stability
Lyophilized Epidermal Growth Factor 21 Leu although stable at room temperature for 3 weeks, should be stored desiccated below -18oC. Upon reconstitution EGF 21-Leu should be stored at 4oC between 2-7 days and for future use below -18oC.
For long term storage it is recommended to add a carrier protein (0.1% HSA or BSA).
Please prevent freeze-thaw cycles.
Synonyms
