Qkine Growth Factors and Cytokines

Ethical and sustainable, Qkine's animal origin-free recombinant growth factor and cytokine proteins are overexpressed in E.coli and tested to guarantee high levels of purity, excellent lot-to-lot consistency, and correct folding for high levels of bioactivity. All proteins are supplied lyophilized and shipped at ambient temperature, with a reconstitution solution also provided at no cost.

Qkine's large range of cost-effective and reliable proteins are manufactured at scale with full traceability. Applications include stem cell research and maintenance, physiologically relevant organoid models, organ-on-a-chip technologies, and cellular agriculture. Qkine products are used by research institutions, pharma, and biotech companies around the world.

Qkine growth factors and cytokines

Guaranteed Quality, Purity, and Bioactivity

Qkine is committed to manufacturing enhanced-quality bioactive proteins to improve scientific outcomes and reproducibility. They guarantee the bioactivity of all their proteins to be equally or more bioactive than those from other dominant suppliers to ensure that your results are reliable and reproducible every time.

High biological activity

Qkine tests and validates the biological activity of all their growth factors against other suppliers’ proteins to ensure that they provide you with the highest level of biological activity.

High quality
Current industry standards require endotoxin levels in growth factor lots to be less than 0.5 EU/mL. However, the lower, the better, and Qkine imposes internal standards of <0.1 EU per µg protein.

High purity
Qkine guarantees >98% purity due to limitations of their assays, but they are confident that the true result is higher. To ensure purity, Qkine always runs an overloaded gel with 7ug of protein to ensure that they can not visually detect any contaminants, aggregates, or degradants.

Excellent lot-to-lot consistency
All Qkine growth factors and cytokines have exceptional lot-to-lot consistency. Every batch is checked during a stringent QC process to ensure it has the same bioactivity as prior batches and to ensure reproducibility.

Long-term stability
All Qkine proteins come lyophilized and the bioactivity is guaranteed for 2 years in lyophilized form. Once reconstituted, the bioactivity remains stable for 12 months in single-use aliquots reducing waste in your process.

Animal-free
All our recombinant proteins are animal-free because an animal-free manufacturing process guarantees reproducible proteins that are pure, bioactive, and free from endogenous contaminants.

Learn more about Qkine's quality control guarantees

Qkine vial and box 9-point quality commitment

Qkine's Nine-Point Quality Commitment

Every Qkine protein is:

Certified animal origin-free with full traceability
Manufactured within our ISO 9001:2015-certified facility with stringent in-process control measures
Rigorously tested for accurate protein recovery from vials
Subject to quantitative bioactivity analysis with integrated lot-to-lot reproducibility criteria
Proven to have industry-leading protein purity levels
Subject to comprehensive identity analysis for structurally complex bioactive proteins
Assayed to ensure industry-leading low endotoxin levels
Rigorously tested for sterility and mycoplasma contamination for confident use in cell-culture applications
From concept to manufacture, our proteins are designed to be the best

See Qkine's Nine-Point Quality Commitment