TITLE:
The Relationships between Dyeing Methods and Dyeability in Hair Colouring by Utilising Enzymatic Oxidation of (+)-Catechin
AUTHORS:
Takanori Matsubara, Chinami Seki, Hidekazu Yasunaga
KEYWORDS:
Catechinone, (+)-Catechin, Bio-Catechol, Hair Dyeing, Enzymatic Oxidation, Tyrosinase
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.7 No.7,
May
18,
2016
ABSTRACT: The
enzymatic oxidation of (+)-catechin (Cat) with copper-containing oxidase,
tyrosinase, was applied to hair colouring in the study. The Cat is oxidised to
be o-benzoquinone form, the catechinone,
which works as the hair dyestuff. Four kinds of hair colouring techniques using
Cat were examined and each of their dyeability was compared in order to improve
it. The first dyeing method is dyeing hair by the redissolved catechinone,
which is preliminarily obtained by the oxidation of Cat (Redissolution Dyeing
Method). The second one is dyeing hair in the dye solution just after the dye
being formed by the enzymatic reaction (Sequential Dyeing Method). The third
one is dyeing hair in solution containing Cat and the dyeing process is
accompanied by the oxidation of Cat (Simultaneous Oxidation Dyeing Method). The
fourth one is two-step dyeing that the hair immersed in Cat solution at the
first step and then it is oxidised enzymatically to colour at the second step
(Post-Oxidation Dyeing Method). The hair is dyed pale yellow by Redissolution
Method, deeper yellowish brown by Sequential and Simultaneous Oxidation Dyeing
Method and slightly reddish brown by Post-Oxidation Method with Cat. The order
of their dyeability is the Simultaneous Oxidation ≈ Post-Oxidation >
Sequential > Redissolution Dyeing Method at 30°C. The dyeability of
Redissolution Method increases with an increase in dyeing temperature (T) between 20°C - 60°C. In Simultaneous
Oxidation Method, the T increment
also provides higher dyeability, and the colour of dyed hair becomes duller
over 50°C. The Post-Oxidation
Method shows higher dyeability at the lower oxidation temperature (20 °C - 40°C).