Fibronectin fragments are obtained from plasma fibronectin by using proteolytic enzymes. These fragments are useful tools for mapping regions within the fibronectin molecule, which are responsible for specific binding to collagen and for other biologically relevant functions.
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We do not determine the purity of fibronectin solutions. An SDS PAGE gel is run and one major fibronectin band of 120kDa is compared to past lots to ensure consistent quality. All our fibronectin powders are ≥95% pure.
The solvents that are compatible to dilute fibronectins are provided in Table 1.
Fibronectin products provided as solutions can be stored for a year at 2 - 8 °C provided they are sterile. Diluted, unused fibronectin can be kept at 2 - 8 °C for up to 1 week. Fibronectin-coated plates can be stored at 2 - 8 °C for up to 4 weeks provided they are sealed well to prevent contamination and/or drying up of fibronectin. Do not use the product if discoloration or cracks appear on the surface of the coated material.
The coating concentrations of our fibronectins are suggested in Table 1. However, optimizing the concentrations that work for your cells is recommended.
While laminin and fibronectin are widely used ECM proteins, the one that your cell needs should be determined by test experiments. Stem cells express varied integrins on the surface during different stages of differentiation. The choice of ECM protein would depend on the stage of differentiation you are interested in studying.