GATE (TF) Textile 2013 Question Paper Solution | GATE/2013/TF/01

In textiles, the fiber that contains nitrogen and sulfur is known as “protein fiber.” Protein fibers are a type of natural fiber that are derived from animal sources, such as silk, wool, and hair. These fibers are composed mainly of proteins, which are complex molecules made up of amino acids. Proteins are rich in nitrogen and sulfur-containing amino acids, such as cysteine and methionine, which contain sulfur atoms. These sulfur-containing amino acids play a crucial role in the structural integrity and properties of protein fibers.

For example, in wool, which comes from sheep, the protein called “keratin” is the main component. Keratin contains cysteine amino acids that form disulfide bonds, contributing to the elasticity, resilience, and durability of wool fibers. Silk, which is produced by silkworms, is another example of a protein fiber that contains nitrogen and sulfur. Silk fibers are composed of a protein called “fibroin” and contain cysteine and other sulfur-containing amino acids, which contribute to silk’s luster, strength, and smooth texture.

Protein fibers are highly valued in the textile industry for their unique properties, including their softness, warmth, and moisture-wicking abilities. They are commonly used in the production of clothing, bedding, and other textile products where comfort, durability, and luxury are desired.