A Diester to Protect Hair from Color Fade and ... - Alluredbooks.com

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422 Chapter 35 Gao et al. Again, the panel evaluation demonstrated a strong correlation between the visual results and the instrumental results. On medium brown hair, 94.1% of panelists chose the tresses treated with the diester shampoo as having retained the most color. Figure 35.4. effects of the diester vs. control shampoo on medium brown hair Figure 35.5. total color change of medium brown-colored hair treated with different shampoos after 15 days of UV exposure
423 A Diester to Protect Hair from Color Fade and Sun Damage UVA protection from a conditioner: Another set of auburn-colored tresses was treated with a rinse-off conditioner containing the diester (Formula 2) and the same conditioner without the UV filter to serve as a control. Figure 35.6 shows that hair tresses washed with the diester conditioner (Figure 35.6d-e) showed less colorfade on auburn-colored hair than the control conditioner (Figure 35.6bc). The left tress was dyed but not exposed to UV radiation (Figure 35.6a) to serve as a reference. Figure 35.6. effects of the diester vs. control conditioner for medium auburn color Although not as definitive as the shampoo studies, 64.7% of the panelists preferred the diester conditioner on auburn-colored hair. UVB protection from a shampoo: To assess for surface tryptophan damage, the surface fluorescence intensities of virgin brown tresses treated with either the control or diester shampoo were determined after 15 equivalent days of UV irradiation (see Figure 35.7) and compared to the fluorescence intensities of the hair before UV exposure. The shampoo containing the diester showed 97.48% tryptophan protection after the 15 equivalent days of exposure, while the control
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A Diester to Protect Hair from Color Fade and ... - Alluredbooks.com

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