Study of keratin hair of domestic cat under methionine and cystine experimental diet using FT-Raman spectroscopy

FT-Raman spectroscopy has been extensively used to study human keratotic biopolymers, such as skin, nail and hair, since the disulfide bonds of keratin protein is Raman-active vibrational mode. In this context, animal hair can also be evaluated by Raman spectroscopy, for the main protein is keratin....

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Bibliographic Details
Published in:Vibrational spectroscopy 2019-01, Vol.100, p.1-5
Main Authors: Sato, Joyce, Ogawa, Camilla Y.L., Sandrini, Marcelo, Medina, Antonio N., Sato, Francielle, Vasconcellos, Ricardo S.
Format: Article
Language:English
Subjects:
Amino acids
Biopolymers
Cat hair
Chemical bonds
Cysteine
Cystine
Diet
Hair
Keratin
Methionine
Proteins
Raman spectroscopy
Skin
Spectroscopic analysis
Spectrum analysis
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Summary:FT-Raman spectroscopy has been extensively used to study human keratotic biopolymers, such as skin, nail and hair, since the disulfide bonds of keratin protein is Raman-active vibrational mode. In this context, animal hair can also be evaluated by Raman spectroscopy, for the main protein is keratin. In this study, domestic cats were submitted to an experimental diet with different levels of methionine and cysteine; then their hair was evaluated by using FT-Raman spectroscopy on the first and on the last day of the diets. The results were compared with tensile rupture measurements. They showed that FT-Raman spectroscopy was able to monitor disulfide bonds (510 cm−1) and keratin protein conformation (amide I) in different sulfur amino acids levels, indicating that the levels above the minimum recommended were not efficient to improve the hair quality.
ISSN:0924-2031
1873-3697
DOI:10.1016/j.vibspec.2018.11.001