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Related Experiment Video

Updated: Jan 27, 2026

Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis
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External lipid function in ethnic hairs.

Luisa Coderch1, Marc A Oliver1, Víctor Carrer1

  • 1Advanced Chemical Institute of Catalonia, (IQAC-CSIC), Barcelona, Spain.

Journal of Cosmetic Dermatology
|March 14, 2019
PubMed
Summary
This summary is machine-generated.

External hair lipids vary significantly across ethnicities, impacting hair properties like moisture and mechanical strength. Lipid extraction reveals differences in lipid composition and structure, influencing hair

Keywords:
IRethnic hairshydrophobic charactermechanical propertiessebaceous lipidswater sorption

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Area of Science:

  • Hair science
  • Biochemistry
  • Materials science

Background:

  • External hair lipids play a crucial role in hair's physicochemical properties.
  • Understanding ethnic variations in hair lipids is essential for targeted hair care formulations.

Purpose of the Study:

  • To characterize external lipids in different ethnic hair types.
  • To investigate the impact of exogenous lipids on hair's mechanical characteristics, water sorption, and contact angle.

Main Methods:

  • Lipid extraction using hexane/tert-butanol to remove external sebaceous lipids.
  • Evaluation of hair properties: contact angle, mechanical characteristics, and water sorption.
  • Infrared spectroscopy (IR) to determine lipid order and arrangement.

Main Results:

  • African hair exhibited the highest total lipid content.
  • Caucasian hair lipids had higher melting points and phase transition temperatures.
  • Lipid-extracted fibers showed decreased moisture content and increased water desorption, with Caucasian fibers demonstrating enhanced lipid order and breaking tenacity.

Conclusions:

  • Hexane/tert-butanol extraction affects both cuticular and cortex lipids.
  • Exogenous lipid depletion reduces hair's water content and increases water desorption.
  • Altered lipid order in extracted Caucasian hair correlates with improved mechanical properties.