| Full text | |
| Author(s): |
Ribeiro de Castro Lima, Cibele Rosana
[1, 2]
;
Alves de Couto, Ricardo Alexandre
[1]
;
Freire, Thamires Batello
[2]
;
Goshiyama, Alessandra Mari
[2]
;
Baby, Andre Rolim
[2]
;
Robles Velasco, Maria Valeria
[2]
;
Leopoldo Constantino, Vera Regina
[1]
;
Matos, Jivaldo do Rosario
[1]
Total Authors: 8
|
| Affiliation: | [1] Univ Sao Paulo, Inst Chem, Sao Paulo - Brazil
[2] Univ Sao Paulo, Fac Pharmaceut Sci, Sao Paulo - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of Cosmetic Dermatology; v. 18, n. 6, p. 1885-1892, DEC 2019. |
| Web of Science Citations: | 0 |
| Abstract | |
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 alpha-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 H2O between 25-170 degrees C and CO2, SCO and H2S from 200 degrees C. Denaturation temperature = 237 degrees C. Protein loss: Asian hair>Caucasian hair. Data presented statistically significant alterations, alpha = 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). (AU) | |
| FAPESP's process: | 11/50318-1 - Development of compounds with pharmacological or medicinal interest and of systems for their transport, detection and recognition in biological media |
| Grantee: | Ana Maria da Costa Ferreira |
| Support Opportunities: | Research Projects - Thematic Grants |