The protein concentration of the extracts was measured by the Bradford protein assay method (Bio–Rad), using bovine serum albumin as standard. The amount of protein dissolved was expressed as a percentage of the total weight of dried feathers used.
The protein concentration of the extractswas measured by the Bradford protein assay method (Bio–Rad), using bovine serumalbumin as standard. The amount of protein dissolved was expressed as a percentageof the total weight of dried feathers used.