Next Article in Journal
7,8-dimethoxycoumarin Attenuates the Expression of IL-6, IL-8, and CCL2/MCP-1 in TNF-α-Treated HaCaT Cells by Potentially Targeting the NF-κB and MAPK Pathways
Next Article in Special Issue
Hair Structures Affecting Hair Appearance
Previous Article in Journal
Efficiency of Skin Whitening Cream Containing Etlingera elatior Flower and Leaf Extracts in Volunteers
Previous Article in Special Issue
Unique Hair Properties that Emerge from Combinations of Multiple Races
Open AccessArticle

The Secrets of Beautiful Hair: Why is it Flexible and Elastic?

R&D-Hair Care Products Research, Kao Corporation, 2-1-3, Bunka, Sumida-ku, Tokyo 131-8501, Japan
*
Author to whom correspondence should be addressed.
Cosmetics 2019, 6(3), 40; https://doi.org/10.3390/cosmetics6030040
Received: 4 June 2019 / Revised: 21 June 2019 / Accepted: 23 June 2019 / Published: 6 July 2019
(This article belongs to the Special Issue Recent Advance in Hair Science and Hair Care Technologies)
Beautiful hair, so called “SHINAYAKA” hair in Japanese, has a good appearance not only when stationary but also when in motion, and it is a highly desirable hair condition for Japanese consumers. We investigated such SHINAYAKA hair, which was selected by sensory evaluation, for the relationship between physical properties, such as flexibility and elasticity, and hair structure. It has already been reported that human hair cortical cells have two types, similar to wool: the ortho-like cortex and the para-like cortex. Microscopic observation revealed that the ortho-like cortex is distributed in the outer layer of the hair (near the hair surface) and the para-like cortex exists in the inner layer (near the center of the fiber). This cell distribution, a concentric double-layered structure, was deemed to be a characteristic of SHINAYAKA hair. Furthermore, analysis of physical properties showed the difference between the elasticity of the outer layer and inner layer, and that this difference was bigger in SHINAYAKA hair compared to other hair. This phenomenon was observed not only in Japanese hair, but also in Caucasian hair. In addition, we have developed a new technology for creating “SHINAYAKA” hair by treatment with succinic acid. Inflexible and inelastic hair can be changed by this treatment, and its flexibility and elasticity improve by selective reduction of stiffness of the outer layer. View Full-Text
Keywords: hair; flexible; elastic; dynamic; motion; ortho-like; para-like; cortex; bending; mechanical; succinic acid; concentric double-layered hair; flexible; elastic; dynamic; motion; ortho-like; para-like; cortex; bending; mechanical; succinic acid; concentric double-layered
Show Figures

Figure 1

MDPI and ACS Style

Ezure, M.; Tanji, N.; Nishita, Y.; Mizooku, T.; Nagase, S.; Osumi, T. The Secrets of Beautiful Hair: Why is it Flexible and Elastic? Cosmetics 2019, 6, 40.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop