Verhalten von Farbstoffen mit Thiosulfat‐Gruppen beim Färben von Wolle

Osterloh, Fritz

doi:10.1002/ange.19620741724

Cited by 4 publications

(1 citation statement)

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“…( 7 ) Douthwaite and Lewis recently presented FTIR/ATR evidence for the removal of keratin Bunte salt groups by reaction with thiol reagents when they treated oxidited and bisulfite-treated wool with ethane thiol [ 21.…”

Section: K-s-s-k + R-s-k K-s-+ K-s-s-r ( 6 ) Andmentioning

confidence: 99%

FTIR Analysis to Study Chemical Changes in Wool Following a Sulfitolysis Treatment

Erra

Gómez

Dolcet

et al. 1997

Textile Research Journal

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Sulfitolysis of wool keratin is important to many industrial processes, including shrink resistance, setting, and bleaching; its extent therefore requires rapid estimation. Currently, time consuming chemical analysis is used to convert the cysteine-S-sulfonate to cysteine and then to measure total cysteine colorimetricaily. Using ftir and the attenuated total reflectance (atr) method, our experiments quantify the relative amount of cysteine-S-sulfonate on the wool fiber surface. The cysteine-S-sulfonate (Bunte salt) shows a strong symmetrical stretching vibration at 1022 cm−1; working in the absorbance mode and taking second derivatives to enhance resolution allows changes in the amount of Bunte salt to be followed. The keratin Bunte salt is stable to acid but labile in alkali; a treatment with ammonium thioglycolate at pH 7.6 completely removes the Bunte salt. Results show the same trend as those obtained using the classical chemical method.

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Section: K-s-s-k + R-s-k K-s-+ K-s-s-r ( 6 ) Andmentioning

confidence: 99%