82 HAIR CARE
Results For hair whose torsional stiffness was significantly reduced by treating with formic acid, it was observed that the application of cashmere-derived hydrolysed keratin restored torsional stiffness (Figure 1).
Effects of cashmere-derived hydrolysed keratin on ultrasonically-treated hair In order to reproduce daily damage without chemical treatment, we prepared hair where long-term daily damage is simulated through ultrasonic treatment, referring to a report by Maruyama et al.2 In this experiment, the hair was treated with
cashmere-derived hydrolysed keratin to verify its effects on daily damage.
Test method Hair bundles were placed in an ultrasonic cleaner and sonicated at 50°C for three hours. After that, they were thoroughly washed with running water, wiped off with a towel to remove moisture, then air-dried at room temperature overnight to create ultrasonically-treated hair bundles. Then, cashmere-derived hydrolysed keratin
was applied to the ultrasonically-treated hair bundles and treatment was performed at room temperature for five minutes. After treatment, hair bundles were thoroughly washed with running water, wiped off with a towel to remove moisture, then air-dried at room temperature overnight. Untreated hair bundles, ultrasonic-
treated hair bundles, and cashmere-derived hydrolysed keratin-treated hair bundles were each equilibrated overnight in a constant temperature and humidity room (25°C, 50%rh), then the torsional stiffness of each hair sample was measured using the KES-YN1 torsional stiffness tester manufactured by Kato Tech.
Results For hair whose torsional stiffness was significantly reduced by ultrasonic treatment, it was observed that the application of cashmere- derived hydrolysed keratin restored torsional stiffness (Figure 2).
Observation of treated hair using SEM Regarding formic acid-treated hair, hair treated with cashmere-derived hydrolysed keratin was observed under a scanning electron microscope (SEM). As shown in Fig. 3, exfoliation of cuticles caused by formic acid treatment was confirmed. It was also confirmed that the application of cashmere-derived hydrolysed keratin suppresses exfoliation.
Cashmere-derived hydrolysed keratin’s effects to improve the feel of hair A human monitor test was conducted to verify the effects of cashmere-derived hydrolysed keratin to improve the hair feel.
Test method A test shampoo containing 1% cashmere- derived hydrolysed keratin and a placebo shampoo in which cashmere-derived hydrolysed keratin was replaced with water
PERSONAL CARE September 2025
Formic acid
Cashmere coat
+ -
Figure 3: Observation of treated hair using SEM Overall impression Volume Lightness
5.5 5.0 4.5 4.0 3.5
Silkiness Control ■ 1% Cashmere ■
+ +
Moistness
Smoothness Softness Figure 4: Cashmere-derived hydrolysed keratin’s effects to improve the feel of hair
were used in the test. Both the test shampoo and placebo shampoo were adjusted so that they could not be distinguished by appearance or odour by matching their colour tones and adding the same fragrance. A commercially available hair treatment was
provided to test subjects so they would use the same hair treatment product throughout the test period. The test was conducted in a single- blind method without telling the subjects which shampoo they were given. Fourteen women who submitted written
consent in advance participated in the test as the subjects and they were asked to wash their hair with the provided shampoo every night. The subjects were asked to use each shampoo for three days, and a questionnaire was given about the conditions of their hair after using each shampoo.
Results Figure 4 shows the evaluation results. From these results, it was confirmed that the moistness, smoothness, softness, and easiness of hand combing were improved.
Conclusion The effects of cashmere-derived hydrolysed keratin on daily damage to hair have been
introduced. cashmere-derived hydrolysed keratin has shown an effective strength recovery effect on hair with damaged CMC, which can lead to daily damage. Furthermore, in an experiment where daily
damage was reproduced using ultrasonic treatment, cashmere-derived hydrolysed keratin demonstrated an efficient strength recovery effect. These results were also confirmed through observation of the hair surface with a scanning electron microscope. In addition, when a monitor test was
conducted using a shampoo containing 1% cashmere-derived hydrolysed keratin, it was highly evaluated for evaluation items related to the feel of hair such as moistness, smoothness, softness, and ease of hand combing. As the name suggests, cashmere-derived
hydrolysed keratin is a product developed to add the feel of cashmere to hair. We hope that this material and the test results introduced in this article will help consumers find a solution to realize their ideal hair.
Easiness
PC
References 1. Amaya M et al. Journal of Fiber Science and Technology. 2012; 69(7), 62
2. Maruyama T et al. Journal of Society of Cosmetic Chemists of Japan. 1993; 27(2), 144
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