Streaming Potential Analysis of Hair Variation: Ethnicities and Environmental Exposures

This study examined the physical and chemical properties of hair from Caucasian, Chinese, and Indian ethnic groups, focusing on variations in hair morphology, growth rates, and mechanical properties. It found that Asian hair generally has a larger diameter and superior mechanical strength, while African hair is more prone to breakage. The study involved 15 individuals from each ethnic group and used electrokinetic analysis to measure streaming potential and ζ-potential changes with pH. Chinese hair had less negative ζ-potential values compared to Indian and Caucasian hair, indicating differences in surface charge and hair health. Caucasian hair showed the steepest gradient in ζ-potential with increasing pH, suggesting higher sensitivity to pH changes. The study also found that Caucasian hair exhibited significant changes in ζ-potential from root to tip, indicating oxidative damage and weathering. The findings suggest that tailored hair care products could be developed to address the unique needs of each ethnic group, considering both genetic and environmental factors. The study emphasizes the need for larger sample sizes and further research into surface properties for more reliable conclusions.