Results are presented from investigations by Differential Scanning Calorimetry (DSC) in water of virgin and bleached human hair samples for commercial use. The two primary results of a DSC investigation are denaturation temperature, TD, which measures the thermal stability of the matrix in human hair, and denaturation enthalpy, ∆HD, which gives the amount and structural integrity of the α-helical material in the intermediate filaments (IFs). Using this analytical approach, the relationship between TD and ∆HD for hair samples at various levels of bleaching was investigated. The relationship between heating rate, β (as ln β) and 1/TD, according to the Arrhenius-equation, was shown to be linear giving for virgin human hair an activation energy of 262 J/mol, while for bleached hair (2h, 9% commercial bleach), a somewhat higher result of 295 J/mol was observed. The effects of thermal denaturation of hair in water for various heating rates were visually assessed by Scanning Electron Microscopy (SEM).
|Publication status||Published - Sept 2011|
|Event||17th International Hair-Science Symposium - HairS'11 - Kloster Irsee, GER|
Duration: 6 Sept 2011 → 8 Sept 2011
|Conference||17th International Hair-Science Symposium - HairS'11|
|City||Kloster Irsee, GER|
|Period||6/09/11 → 8/09/11|
- human hair, bleaching, dsc, denaturation, activation energy, sem, structure