We offer the majority of our recombinant proteins in a convenient, ready-to-use liquid format, which have a comparable shelf-life to lyophilized proteins.

 

Advantages of Liquid Recombinant Proteins:

 

 

We perform extensive stability testing to ensure that each of our proteins is stable in a liquid format when handled and stored properly. In most cases, our liquid format recombinant proteins exhibit superior in-use shelf life when compared with competitor lyophilized proteins. If extended storage is desired, our proteins typically possess comparable long-term stability to competitors when stored at -80°C.

Storage

BioLegend (Liquid)

Competitor A (After Reconstitution)

Competitor B (After Reconstitution)

-80°C

12 months

3 - 12 months

3 months

-20°C

6 months

3 - 12 months

3 months

2-8°C

1-3 months

1 week

1 month

Stability Testing

Each recombinant protein released undergoes extensive stability testing to ensure product performance over the reagent’s entire shelf life.

Recombinant proteins were aliquoted in PBS pH 7.2 at 0.2 mg/ml. One aliquot was frozen and thawed four times (4x freeze/thaws), one was kept at RT, and one was kept at 37°C for one week. All samples were tested for bioactivity as compared to a control stored at 4°C.

Long-Term Stability Testing

We periodically retest our recombinant proteins at later time points and have shown that some recombinant proteins retain their activity even after 10 years in storage at -80°C.

Recombinant proteins stored at -80°C for 10 years were tested for bioactivity as compared to a fresh competitor  lyophilized protein.