Hydrolysis process optimization of feather & down powder and its hydrolysate film forming property

In order to study the hydrolysis of waste feather down and the formed film property of the hydrolysis products,the waste feather down which have been mechanically ground into fine powder firstly,was hydrolyzed into polypeptide powder by reduction-caustic soda two-step hydrolysis technique.The study focused on the impact of factors such as reductant quantity,temperature of hydrolysis,and auxiliary on the productivity of polypeptide powder. Besides,the property of the formed film of the products was also studied. The powder,polypeptide powder,and formed film were characterized by FTIR,XRD,DTG and SEM. The findings showed that the reduction-caustic soda two-step hydrolysis technique could improve the productivity of polypeptide powder. On the basis of the theory of one factor optimization,the conditions of the reduction-caustic soda two-step hydrolysis technique are as follows:mercaptoacetic acid concentration 0. 2 mol /L,reduction temperature 80 ℃,urea concentration 14 g /L,and LAS concentration 2 g /L in the reduction process. When the polypeptide powder was dissolved into formic acid, polypeptide film could be prepared, and addition of crosslinker could improve the mechanical properties of the film. SEM examination showed that reducing process corroded the powder obviously. According to the FT-IR spectra the reduction process could broke the disulfide bond of feather down powder. XRD DTG analysis showed that the thermal stability of the polypetide power dropped a little and the crystalline state also changed.