Human IL-21 Protein (E. coli), Research Grade

Research use only

Features and Advantages

1. Native Conformation: Native sequences, tag-free and natural function.
2. Reliable Activity: Biological activity calibrated against WHO/NIBSC standards.
3. Stringent Quality Control: Protein content, purity, and cell-based bioactivity testing for each batch.
4. Lowest Endotoxin level (<0.01 EU/ug).
5. Safety Assurance: Sterile filtration through 0.2 μm membrane.
6. AOF: Animal origin-free raw materials throughout the production process.

Synonym

IL21, Za11, Interleukin-21

Source

Human IL-21 Protein (E. coli), Research Grade (IL1-H5115) is expressed from E. coli cells. It contains AA Gln 30 - Ser 162 (Accession # Q9HBE4-1).

Predicted N-terminus: Met

Molecular Characterization

Other Tags and Version Biotin & Other Labeled Version

This protein carries no "tag".

The protein has a calculated MW of 15.5 kDa. The protein migrates as 17 kDa±3 kDa when calibrated against Star Ribbon Pre-stained Protein Marker under reducing (R) condition (SDS-PAGE).

Endotoxin

Less than 0.01 EU per μg by the LAL method / rFC method.

Purity

>95% as determined by SDS-PAGE.

>95% as determined by SEC-HPLC.

Formulation

Lyophilized from 0.22 μm filtered solution in PBS, pH7.4 with trehalose as protectant.

Contact us for customized product form or formulation.

Reconstitution

Please see Certificate of Analysis for specific instructions.

For best performance, we strongly recommend you to follow the reconstitution protocol provided in the CoA.

Storage

For long term storage, the product should be stored at lyophilized state at -20°C or lower.

Please avoid repeated freeze-thaw cycles.

This product is stable after storage at:

1. -20°C to -70°C for 12 months in lyophilized state;
2. -70°C for 3 months under sterile conditions after reconstitution.

ACRO Quality Management System

1. QMS(ISO, GMP)
2. Quality Advantages
3. Quality Control Process

Quality Description

ACRO's Research-grade products are suitable for a wide range of cell culture applications, particularly for research use in academic institutions. These products are sterilized by filtration, followed by lyophilization where applicable. Typical specifications include endotoxin levels of <0.01 EU/μg and purities >95%. Biological activity is calibrated against WHO/NIBSC standards when available.
ACRO's Premium-grade (Pre-GMP) products are characterized by their high quality and enhanced safety profiles, making them ideal for early-stage discovery and manufacturing processes in cell therapy companies. A key advantage is their seamless transition to corresponding GMP-grade versions. Biological activity is calibrated against WHO/NIBSC standards when available. Typical specifications include endotoxin levels of <0.01 EU/μg and purities >95%. In addition, rigorous testing is conducted to ensure the absence of mycoplasma, HCD, and HCP, thereby guaranteeing product safety.