Hair fiber characteristics and methods to evaluate hair physical and mechanical properties / Características da fibra do cabelo e métodos para avaliar o cabelo propriedades físicas e mecânicas
Braz. j. pharm. sci
;
45(1): 153-162, jan.-mar. 2009. ilus
Article
in English
| LILACS
| ID: lil-525782
ABSTRACT
The hair thread is a natural fiber formed by keratin, a protein containing high concentration of sulfur coming from the amino acid cystine. The main physical proprieties of the hair depend mostly on its geometry; the physical and mechanical properties of hair involve characteristics to improve elasticity, smoothness, volume, shine, and softness due to both the significant adherence of the cuticle scales and the movement control (malleability), as well as the easiness of combing, since they reduce the fibers static electricity. The evaluation of these effects on hair may be carried out by several methods, as optical and electron microscopy, mechanical resistance measuring, shine evaluation and optical coherence tomography (OCT).
RESUMO
O cabelo é uma fibra natural formada por queratina, uma proteína composta por teor elevado de enxofre proveniente da cistina. As propriedades principais do cabelo dependem de sua geometria, estrutura física. Características físicas e mecânicas das fibras capilares envolvem propriedades que melhoram elasticidade, maciez, volume, maleabilidade, facilidade para o ato de pentear e brilho. A avaliação de tais propriedades do cabelo pode ser obtida por métodos diversos, como microscopia óptica e eletrônica, mensuração da resistência mecânica, determinação do brilho e tomografia por coerência óptica (OCT).
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Biomechanical Phenomena
/
Chemical Phenomena
/
Hair
Type of study:
Diagnostic study
/
Evaluation studies
Limits:
Humans
Language:
English
Journal:
Braz. j. pharm. sci
Year:
2009
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Institute of Energetic and Nuclear Researches/BR
/
University of São Paulo/BR
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