Wavelength dispersive X-ray fluorescence (WDXRF) and chemometric investigation of human hair after cosmetic treatment

Autor(es)

Santos, Monica Cardoso ^[1] ; Speranca, Marco Aurelio ^[2] ; Verbi Pereira, Fabiola Manhas ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista Unesp, Inst Quim Araraquara, Rua Prof Francisco Degni 55, BR-55148000 Araraquara, SP - Brazil

^[2] Univ Fed Sao Carlos UFSCar, Dept Quim, Rodovia Washington Luis, Km 235, BR-23513565 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: X-RAY SPECTROMETRY; v. 47, n. 3, p. 252-257, MAY-JUN 2018.
• Citações Web of Science: 2

Resumo

Variations in the chemical composition of 63 different human and 6 different synthetic hair samples were investigated using wavelength dispersive X-ray fluorescence (WDXRF) spectra profiles. To evaluate the effect of cosmetic treatment on the strands, the human hair samples were bleached, but the synthetic ones were not. To better investigate the data, exploratory analyses were calculated using principal component analysis for the WDXRF spectra. Eight normalizations/standardizations were applied in the WDXRF to verify the clustering tendency. Bleaching was tested, because it is one way in which people mask their real hair color. After the data were standardized, an enhancement of the data discrimination was verified. Furthermore, the explained variance was higher in the first principal components. The WDXRF spectra were able to distinguish samples with distinct features, including synthetic, dyed, and straightened hair. The findings of this study hold promise for forensics due to desirable aspects such as nondestructivity and the possibility of a large hair sample database. (AU)

• Processo FAPESP: 16/00779-6 - Obtenção direta de informações químicas de interesse comercial de matrizes analíticas sólidas diversificadas utilizando a espectroscopia de emissão com plasma induzido por laser (LIBS) e quimiometria
• Beneficiário: Hideko Yamanaka
• Modalidade de apoio: Auxílio à Pesquisa - Regular