Laccase-catalysed polymeric dye synthesis from plant-derived phenols for potential application in hair dyeing: Enzymatic colourations driven by homo- or hetero-polymer synthesis.
Bottom Line: We finally used selected materials to dye grey hair.Each material coloured hair appropriately and the dyeing showed excellent resistance to conventional shampooing.Our study indicates that laccase-catalysed polymerization of natural phenols is applicable to the development of new cosmetic pigments.
Affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.Show MeSH
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Mentions: We next divided the selected colouration polymers into soluble and insoluble components, to characterize visible light absorbance capacities of soluble polymers and the hydrodynamic size distributions of insoluble polymers. Hair dyeing is based on diffusion of dye molecules, particularly into hair cuticle cavities of the cortex layers, resulting in sorption of colourful materials (Chandrashekara and Ranganathaiah, 2009). Polymeric dye size affects sorption and the visible light absorbance capacities of dyes determine hair colour after sorption. Therefore, it was important to evaluate light absorbance capacities and size distributions of the new polymeric dyes. After 24 h laccase incubation with catechin and catechol, or ferulic acid and syringic acid, insoluble polymers of hydrodynamic sizes 90–220 nm were found, but polymers obtained from the gallic acid and syringic acid mixture were slightly larger, and had a broader size distribution, from 130–400 nm (Fig. 6A). Visible light absorbance spectra showed that the absorbance capacities of soluble polymers obtained from gallic acid and syringic acid, or catechin and catechol, increased with decreasing wavelengths. However, the red polymers obtained in the reaction of ferulic acid and syringic acid (Fig. 4F) absorbed visible light maximally at the specific wavelength of 483 nm (Fig. 6B).
Affiliation: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.