From a viewpoint that disulfide bond (S-S stretching vibration) demonstrates the considerable strength of Raman activity, the (-S-S-) bond in hair treated with the permanent waving agent was studied by Raman spectroscopy. It was found that even with a singlehair a favorable Raman spectrum can be obtained for a white hair, though not for a black hair. It was confirmed by the Raman spectroscopy that the band intensity of hair, at about 510cm
-1 based on the (-S-S-) bond, reduced apparently upon treatment with the permanent waving agent 1st solution and increased again by treatment with the permanent waving agent 2nd solution to the former level.
It was feasible to examine the (-S-S-) bond of hair quantitatively by calculating a ratio of band intensity based on the (-S-S-) bond against that of amide I based on the peptide bond as the standard, (510cm
-1)/(1665cm
-1). Raman spectroscopy which requires no troublesome pretreatment has shown that the degree of reduction or degree of recovery of the (-S-S-) bond of hair obtained for a series of the cold permanent waving agent models was in good agreement with previously reported results obtained by the determination of cysteic acid residues with amino acid analysis and/or infrared spectroscopy.
It was confirmed that the waving efficiency under treatment with the permanent waving agent and the degree of reduction of the breaking strength per sectional area of hair were influenced by the degree of reduction of the (-S-S-) bond under treatment with the 1st solution, and that with increasing the degree of reduction of the (-S-S-) bond of hair under treatment with the 1st solution, the waving efficiency became higher and the degree of reduction of breaking strength per sectional area of hair became larger.
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