Effects of solar radiation on hair and photoprotection

Author(s)

Dario, Michelli F. ^[1] ; Baby, Andre R. ^[1] ; Velasco, Maria Valeria R. ^[1]

Affiliation

^[1] Univ Sao Paulo, Dept Pharm, BR-05508000 Sao Paulo - Brazil

• Document type: Review article
• Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY; v. 153, p. 240-246, DEC 2015.
• Web of Science Citations: 9

Abstract

In this paper the negative effects of solar radiation (ultraviolet, visible and infrared wavelengths) on hair properties like color, mechanical properties, luster, protein content, surface roughness, among others, will be discussed. Despite knowing that radiation damages hair, there are no consensus about the particular effect of each segment of solar radiation on the hair shaft. The hair photoprotection products are primarily targeted to dyed hair, specially auburn pigments, and gray shades. They are usually based on silicones, antioxidants and quaternary chemical UV filters that have more affinity for negatively charged hair surface and present higher efficacy. Unfortunately, there are no regulated parameters, like for skin photoprotection, for efficacy evaluation of hair care products, which makes impossible to compare the results published in the literature. Thus, it is important that researchers make an effort to apply experimental conditions similar to a real level of sun exposure, like dose, irradiance, time, temperature and relative humidity. (C) 2015 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 13/16070-8 - Nanotechnological bioactive hair conditioner to protect hair from ultraviolet radiation
• Grantee: Maria Valeria Robles Velasco
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/16265-3 - Development and evaluation of the effectiveness of bioactive cationic nanoemulsion in protecting hair photo-oxidative damage
• Grantee: Michelli Ferrera Dario
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)