Purification and characterization of bovine milk fibronectin.

Fibronectins were isolated from both bovine colostrum and fresh milk, and they were found to be very similar to plasma fibronectin. The concentration of fibronectin in milk decreased post partum: 30 micrograms/ml after 0 d and 2 micrograms/ml after 7-851 d. No fibronectin could be detected in any brands of ultra heat treated liquid milk on the market (less than or equal to 0.006 micrograms/ml).