The extraction of feather keratin biopolymer structures was studied using chicken feathers as a biomass material by the cold acid\nhydrolysis reaction; the recrystallization stage was performed using microwave or ultrasound irradiation, and conduction heating\nwas used as a reference. The microwave or ultrasound irradiation modified the texture and the morphology of the obtained\nmaterials, and they can be controlled depending on the time exposure and the power of the irradiation; this has high relevance in\nthe design of new materials to obtain nanostructures depending on the specific application. It was found that the microwave\nirradiation promotes the growth of the beta sheet over the alpha helix, and in the case of ultrasound irradiation, the growth is\nreversed being similar to the conduction heating; the porosity properties remain invariant, modifying the particle sizes depending\non the exposure time and power of irradiation. Therefore, the feather keratin biopolymer, when modified by microwaves and\nultrasound in the recrystallization stage, is a fibrous protein that has good mechanical, structural, morphological, and thermal\nproperties with potential applications such as development of biocompatible materials with cellular interaction and in catalysis as\ncatalytic and enzymatic support to mention just a few.
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