著者

Takanori Matsubara Chinami Seki Hidekazu Yasunaga

出版者

The Society of Cosmetic Chemists of Japan

雑誌

日本化粧品技術者会誌 (ISSN:03875253)

巻号頁・発行日

vol.56, no.2, pp.130-140, 2022-06-20 (Released:2022-06-21)

参考文献数

21

被引用文献数

1

---

In this study, the authors investigated hair colouring by utilising chemical oxidation of biocatechols, which are obtained from organisms and have catechol (o-dihydroxybenzenes) groups such as (+)-catechin (Cat), (-)-epicatechin (EC), L-3,4-dihydroxyphenylalanine (DOPA), hematoxyline (HX), braziline (BZ), rosmarinic acid (RA), caffeic acid (CA) and chlorogenic acid (ChA). The three types of dyeing methods for the chemically decolourised white human hair were tried as follows: the dyeing by using the solution of the oxidised bio-catechols at 30 °C and pH = 7 (redissolution dyeing), the dyeing by using the oxidation solution of bio-catechol reacting at 30 °C and pH = 10.8 with the introduction of O2 gas continuously (simultaneous oxidation dyeing) and the oxidation by O2 at 30 °C and pH = 11.6 after the treatment of hair with the bio-catechol solution at 30 °C (post-oxidation dyeing). The order of the hair dyeability of the methods using Cat as the bio-catechol was found to be post-oxidation>redissolution>simultaneous oxidation dyeing. Moreover, the resulting colour of hair dyed with Cat by post-oxidation dyeing was reddish brown. The results demonstrate that EC, HX and BZ are also available for hair dyeing by using post-oxidation dyeing and the colours of the dyed hair are yellowish brown, deep brown and reddish brown, respectively. It was found that the bio-catechols having a chroman (3,4-dihydro-2H-1-benzopyran) structure with the catechol part work effectively as dye precursors for colouring hair by the post-oxidation dyeing technique.

著者

Takanori MATSUBARA Naoka ISE Katsuki WATANABE Chihiro SAKURAI Hidekazu YASUNAGA

出版者

The Textile Machinery Society of Japan

雑誌

Journal of Textile Engineering (ISSN:13468235)

巻号頁・発行日

vol.64, no.6, pp.151-155, 2018-12-15 (Released:2019-04-03)

参考文献数

15

被引用文献数

4

---

The hair dyeing using green tea extracts containing high amount of catechins in combination with chemical oxidants such as O2, H2O2 and NaIO4 was attempted in order to establish a novel hair dyeing technique without using aromatic amines contained in commercial oxidation dye products. The new hair dyeing technique consists of a twostep colouration system. The first step is treatment of hair with tea extract solution and the second one is oxidation treatment. Three kinds of oxidation methods such as (1) treating hair with basic dyeing solution (pH = 11.5) supplied with large amount of O2 gas (O2 method), (2) treating hair with H2O2 solution (pH = 9.5) (H2O2 method), (3) treating hair with NaIO4 solution (pH = 7) (NaIO4 method) were attempted as the second oxidation treatment. The results show that once dyed hair is discoloured by H2O2 in the oxidation process and white hair is hardly coloured by the method. In contrast, white hair is dyed brown by the O2 or NaIO4 method, and the dyeability increases with increasing temperature of the first tea extract treatment. This may be due to the increase in the amount of dye precursors adsorbed onto hair by heating. Colour fastness of the hair samples dyed by the O2 and NaIO4 method to washing is almost same level as that by the commercial oxidation dyes. The NaIO4 method is more useful than the O2 method because the supply of O2 gas is unnecessary for the NaIO4 one and it uses the neutral solution.