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Synthesis of Plant Phenol-derived Polymeric Dyes for Direct or Mordant-based Hair Dyeing

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Changes in hair properties by Eucalyptus extract.

Akira Mamada¹, Mariko Ishihama, Reiko Fukuda

¹Kao Corporation, Beauty Research Center, 2-1-3 Bunka Sumida, Tokyo 131-8501, Japan.

Journal of Cosmetic Science

|January 22, 2009

Summary

This summary is machine-generated.

Long-term use of Eucalyptus extract scalp lotion improves hair luster and bounce by increasing ceramide in the skin. This hair strengthening effect was observed across diverse demographics, indicating broad efficacy.

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Area of Science:

Dermatology and Cosmetology
Materials Science
Biophysics

Background:

Scalp lotions aim to improve hair health and physical properties.
Eucalyptus extract is known to increase skin ceramide levels.
The impact of Eucalyptus extract on hair fiber properties requires detailed investigation.

Purpose of the Study:

To evaluate the long-term effects of a Eucalyptus extract scalp lotion on hair fiber properties.
To assess the efficacy of the scalp lotion across different demographic groups.
To elucidate the biophysical and structural mechanisms behind observed hair improvements.

Main Methods:

Long-term half-head or whole-head usage studies with diverse panelists.
Measurement of hair gloss intensity and bending stress.
Atomic Force Microscopy (AFM) nano-indentation to determine Young's modulus of hair cortex.
Infrared (IR) spectroscopy to analyze hair structural changes.

Main Results:

Panelists reported improved hair luster and root bounce with long-term lotion use.
Objective measurements confirmed enhanced hair gloss and bending stress.
AFM revealed increased Young's modulus in Eucalyptus extract-treated hair cortex.
IR spectra indicated a decrease in alpha-helix and an increase in beta-sheet structures.

Conclusions:

Eucalyptus extract scalp lotion demonstrably improves hair physical properties like luster and bounce.
The observed benefits are linked to increased hair cortex elasticity and structural modifications.
The efficacy of Eucalyptus extract in hair care is consistent across various ages, genders, and ethnicities.