There isn't one single chemical formula for keratin. Keratin is a family of fibrous structural proteins, not a single molecule with a defined formula like water (H₂O). Different types of keratin exist, with varying amino acid compositions depending on their location in the body (hair, skin, nails, etc.).
Understanding Keratin's Composition
Keratin's primary structure consists of a chain of amino acids. The specific amino acids and their sequence determine the type of keratin and its properties. Some abundant amino acids in keratin include cysteine, cystine, serine, glutamic acid, glycine, threonine, arginine, valine. Source: Hair Structure and Chemistry | CRLAB
The provided references mention various chemical formulas (e.g., C₂H₂BrClO₂, C₂₈H₄₈N₂O₃₂S₄), but these are not the formulas for keratin itself. These are likely formulas for specific compounds found in analyses of keratin samples, or related molecules. For example, C₂H₂BrClO₂ appears in a reference detailing keratin as a compound from a supplier, which is likely an impurity or an associated substance. C₂₈H₄₈N₂O₃₂S₄ is the formula for Keratan Sulfate, a different molecule entirely.
Alpha-keratin (α-keratin) is a common type found in vertebrates. Its structure involves coiled-coil structures of several protein chains interacting together to form strong, insoluble fibers. Source: Keratin - Wikipedia The complexity of its structure makes a single, concise chemical formula impossible.
Key Takeaways
- Keratin is a family of proteins, not a single compound.
- Its structure is complex and varies depending on the location and type of keratin.
- There is no single chemical formula that accurately represents all keratins.
