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Heat‐damaged evaluation of virgin hair
Author(s) -
Lima Cibele Rosana Ribeiro de Castro,
Couto Ricardo Alexandre Alves de,
Freire Thamires Batello,
Goshiyama Alessandra Mari,
Baby André Rolim,
Velasco Maria Valéria Robles,
Constantino Vera Regina Leopoldo,
Matos Jivaldo do Rosário
Publication year - 2019
Publication title -
journal of cosmetic dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.626
H-Index - 44
eISSN - 1473-2165
pISSN - 1473-2130
DOI - 10.1111/jocd.12892
Subject(s) - cuticle (hair) , fourier transform infrared spectroscopy , differential scanning calorimetry , keratin , chemistry , scanning electron microscope , thermogravimetry , biophysics , materials science , anatomy , composite material , chemical engineering , biology , medicine , pathology , physics , engineering , thermodynamics , inorganic chemistry
Summary Background Hair‐straightening treatments may involve the use of thermal devices, which potentially cause damages in the cuticle and cortex of the hair fibers. Particularly, the heat causes denaturation of the α‐keratin and the degradation of the components of the hair cortex. Objectives The aim of this study was to evaluate the effect of heating on the cuticle and cortex of the Caucasian and Asian virgin hair by using heat iron flat. Methods The effects of the heating in the tresses of Caucasian and Asian virgin hair were analyzed by thermogravimetry/differential scanning calorimetry‐Fourier transform infrared/mass spectrometry (TG/DSC‐MS/FTIR), protein loss analysis (PLA), Fourier transform infrared (FTIR‐ATR), and scanning electron microscope (SEM). Results TG/DSC‐MS/FTIR results were: formation of the H 2 O between 25‐170°C and CO 2 , SCO and H 2 S from 200°C. Denaturation temperature = 237°C. Protein loss: Asian hair>Caucasian hair. Data presented statistically significant alterations, α = 5, P ≤ 0.05, n = 3. FTIR‐ATR: changes in the secondary structural conformation of the protein of hair cuticle. SEM: heat caused damage to hair cuticle. Conclusions The results evidenced the importance of the control of temperature in the procedures involving heat. The damage caused by thermal devices showed be dependent of the ethnicity analyzed (Caucasian and Asian hair).