Protection effects of milk thistle extract, benzophenone-3, and non-ionic silicon tohair fibers were compared by measuring protein degradation, tryptophan degradation,lipid peroxidation, tensile characteristics and color change of hair exposed to irradiation. Experiment results indicate that milk thistle extract is more marked in protection of protein, lipid, breaking work in hair due to its strong antioxidant ability, while benzophenone-3 is the most effective in tryptophan protection. Color protection was significantly observed in silicone and milk thistle extract treated samples. However, the synergy of milk extract with non-ionic silicone emulsion and benzophenone-3 with non-ionic silicone for protecting hair was not encouraged.
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