The cleaned, dried, and cut feathers were dissolved in an aqueous solution of 5% wt NaOH and 0.1 M solution of Na2S. The process was conducted under dynamic conditions, at a temperature of 40 °C over 2 hours. After the process was finalised, the keratin solution was filtered in order to separate the insoluble parts of feathers, and next submitted to dialysis. The dialysis was conducted with the use of a 76 × 49 mm cellulose dialysis