Changes in hair properties by Eucalyptus extract

Abstract

A long-term usage investigation of a scalp lotion containing Eucalyptus extract, which increases the amount of ceramide in the skin, was carried out to explore the change in physical properties of the hair fiber. Half-head or whole-head usage studies of a scalp lotion with Eucalyptus extract were carried out for the following groups: Japanese female, Japanese senior female, Japanese male, and Caucasian female panelists. As a result, the improvement in hair luster and bounce in the root part of the hair were recognized by the panelists after the long-term application of the scalp lotion with Eucalyptus extract. Measurement of hair gloss intensity and bending stress at the root suggests that this improvement is based on changes in these physical properties. These results indicate that the recognition of panelists is based on an actual change in the hair fiber properties. The efficacy of Eucalyptus extract is expressed regardless of race, age, or gender, since similar results were confirmed in all panelist groups.In order to investigate the cause of these phenomena, we measured the elasticity (Young's modulus) of the new-growth part of the cortex in Eucalyptus extract-treated hair and placebo hair by the nano-indentation method of atomic force microscopy (AFM). These results suggest that the Young's modulus of the new-growth part of the cortex in Eucalyptus extract treated-hair increases in comparison with placebo hair. The IR spectra of treated samples of hair show changes that appear to confirm a decrease in the alpha-helix structure and an increase in the betasheet structure.A novel approach is taken to understand the mechanical performance of fixative-treated hair tresses. Polymer composite principles are applied to explain the performance. Examples are given for polyacrylate-2 cross-polymer that show that the choice of neutralizer affects the film properties of anionic acrylic polymers by plasticization or by hardening through ionic (physical) crosslinking. The effect of these changes in the polymer film on the composite properties was determined by mechanical stiffness and high-humidity curl retention testing. It is shown that both adhesion to the hair and polymer cohesion are important in determining fixative polymer performance. The implications of the results for the formulation of fixative systems are discussed.

The pharmacological and therapeutic importance of Eucalyptus species grown in Iraq

“…The results suggested that the Young's modulus of the new-growth part of the cortex in Eucalyptus extract treated-hair was increased in comparison with placebo hair. The IR spectra of treated samples of hair showed changes that appear to confirm a decrease in the alpha-helix structure and an increase in the beta-sheet structure [158].…”

Artificial Intelligence in hair research: A proof‐of‐concept study on evaluating hair assembly features

“…Fibre stiffness has also been reported as an end point for measuring the effect of styling polymer treatments as well as for treatments with actives anticipated to have penetrated the fibre structures following a prolonged contact time. The instruments and methods used vary, from measuring bending force [8] through loop deformation force [9] to measuring bending angle due to gravitational force [10]. Atomic Force Microscopy nano‐indentation and nano‐scratch methods have been used to examine cuticle hardness and elasticity in situ , concluding that chemical and conditioning treatments cause cuticle softening in Caucasian hair [11].…”