Load-extension curves of enzymatically treated hair.

(A) Hair treated with 0.2, 1 or 2 KU/mL of Multifect PR 6 L or Cibenza DP100 at pH 8, or 0.02, 0.1 and 0.2 KU/mL of Ronozyme ProAct at pH 10. The control is defined as hair samples treated in buffer solution without enzyme. Values represent the load in Newtons required for hair to break. Data is represented as means ± SD (n = 10). *Significant statistical difference with control sample (p ≤ 0.01). (B) Load vs extension curves for the control, 2 KU/mL Multifect PR 6L, 2 KU/mL Cibenza DP100 and 0.2 KU/mL Ronozyme ProAct treated hair samples. The end point of each curve represents the force at the point of hair breakage.