Wool fiber is mainly natural pertinacious fiber which consists of α-keratin. It containsvarious types of amino acids. Since there are a lot of S—S cross-linked bonds in keratinof wool fiber, it is very difficult for the fiber to be dissolved in solution. For manyyears. chemical degradation and purification are needed for the analysis of first-order struc- It containsvarious types of amino acids. Since there are a lot of S-S cross-linked bonds in keratinof wool fiber, it is very difficult for the fiber to be dissolved in solution. For manyyears. chemical degradation and purification are needed for the analysis of first-order struc-