The shape of hair is determined in part by the pattern of...

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Key Concepts

Chemical Modification and Redox Reactions

The induction of curls in hair often involves chemical treatments that alter the disulfide bonds in keratin. This process typically uses reducing agents to break existing disulfide bonds and then oxidizing agents to reform them, but with a new pattern that results in a curled configuration. Such redox reactions are central to permanently or temporarily changing hair structure.

Keratin Structure

Keratin is the primary structural protein in hair, composed largely of amino acids like cysteine. The specific arrangement of disulfide bonds in keratin is a key determinant of hair characteristics, such as curliness or straightness. Modifications to these bonds can therefore directly alter hair shape.

Disulfide Bonds

Disulfide bonds are covalent connections between the sulfur atoms of cysteine residues within proteins. They are critical for maintaining the three-dimensional structure of proteins, such as keratin, by holding different parts of the molecule together. In hair, the pattern of these bonds helps determine the hair's overall shape and texture.

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