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Leptin Human/ 重組人瘦素 產(chǎn)品編號：CYT-228

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Leptin Human/ 重組人瘦素 產(chǎn)品編號：CYT-228
產(chǎn)品規(guī)格：200μg/1mg/5mg

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Leptin Human/ 重組人瘦素

產(chǎn)品編號：CYT-228
產(chǎn)品規(guī)格：200μg/1mg/5mg
 

Synonyms OB Protein, Obesity Protein, OBS, Obesity factor.
Introduction A 16-kDa peptide hormone secreted from white adipocytes and implicated in the regulation of food intake and energy balance. Leptin provides the key afferent signal from fat cells in the feedback system that controls body fat stores.
Description Leptin Human Recombinant produced in E.Coli is a single, non-glycosylated, polypeptide chain containing 146 amino acids and having a molecular mass of 16 kDa.
The Leptin is purified by proprietary chromatographic techniques.
Source Escherichia Coli.
Physical Appearance Sterile Filtered White lyophilized （freeze-dried） powder.
Formulation The protein was lyophilized from a concentrated （1mg/ml） solution with 0.0045mM NaHCO3.
Solubility The lyophilized Leptin is very soluble in water and most aqueous buffers below and above the isoelectric point.
Stability Lyophilized Leptin although stable at room temperature, should be stored desiccated below 0°C. Reconstituted Leptin is best stored refrigerated at 4°C.
Purity Greater than 95.0% as determined by（a） Analysis by RP-HPLC.
（b） Analysis by SDS-PAGE.
Amino acid sequence The sequence of the first five N-terminal amino acids was determined and was found to be Ala-Val-Pro-Ile-Gln.
Biological Activity Biological Activity is evidenced by inducing proliferation of BAF/3 cells stably transfected with the long form of human leptin receptor.
Protein content Protein quantitation was carried out by two independent methods
1. UV spectroscopy at 280 nm using the absorbency value of 0.878 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 （InliGenetics）.

2. Analysis by RP-HPLC, using a calibrated solution of Leptin as a Reference Standard.
Usage ProSpec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.


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