TLDR Electrostatic interactions mainly stabilize the binding of peptides to hair keratin.
The study conducted molecular dynamics simulations to predict the binding affinity of four peptides to human hair keratin. It found that electrostatic interactions were the primary force stabilizing the keratin/peptide complex. Using the molecular mechanics–Poisson‐Boltzmann surface area (MM-PBSA) methodology, the researchers determined that the dielectric constant within the protein's interior significantly influenced the free energy calculations. To align the computational results with experimental binding data, they used an average dielectric constant.
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September 2004 in “Biomacromolecules” The Glu413Lys mutation in keratin affects hair stability, while Glu413Asp does not.
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June 2004 in “Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences” Human hair becomes weaker and stretches more easily at higher temperatures.
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December 1991 in “Journal of Dermatological Science” Human nails contain both skin and hair keratins, each needing different extraction methods.