TLDR X-ray microscopy can non-invasively show hair structure changes after treatments, but it's less detailed than TEM and needs improvement.
The study explored the use of newly-developed X-ray microscopy with an 80–100 nm spatial resolution to evaluate the interior morphology of hair without the artificial changes caused by traditional methods like SEM and TEM. The researchers applied various treatments (UV irradiation, heating, dyeing, bleaching, and permanent waving) to Japanese standard hair tress No. 8 and found that X-ray microscopy provided more intact images of the hair cuticle and fine cracks in the cortex compared to TEM. The internal morphological changes observed included coarsening of cuticles and dehydration of the cortex and medulla. Despite some limitations in resolution compared to TEM, X-ray microscopy showed promise as a non-invasive tool for detailed hair analysis.
72 citations,
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150 citations,
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December 2018 in “Macedonian Journal of Chemistry and Chemical Engineering” A new method accurately measures amino acids in treated hair, showing bleaching reduces amino acids while protein treatments increase them.
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January 2004 in “Exogenous dermatology” Outside factors like grooming, chemicals, and the environment can damage hair and cause disorders.
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February 2023 in “International journal of molecular sciences” Body hairs can be used in forensic science and toxicology like scalp hair.
8 citations,
November 2022 in “International Journal of Cosmetic Science” Human hair varies widely and should be classified by curl type rather than race.
