FTIR analysis to study chemical changes in wool following a sulfitolysis treatment

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 c...

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Bibliographic Details
Published in:Textile research journal 1997-06, Vol.67 (6), p.397-401
Main Authors: Erra, P. (CID, CSIC, Barcelona, Spain.), Gomez, N, Dolect, L.M, Julia, M.R, Lewis, D.M, Willoughby, J.H
Format: Article
Language:English
Subjects:
ANALISIS CUANTITATIVO
ANALYSE QUANTITATIVE
ANALYTICAL METHODS
ATTENUATED TOTAL INTERNAL REFLECTANCE TECHNIQUE
CHEMICAL REACTIONS
CHEMICAL TREATMENT
CISTEINA
CISTINA
COMPOSE ORGANOSOUFRE
COMPUESTO ORGANICO DEL AZUFRE
CYSTEINE
CYSTEINE-S-SULFONATE
CYSTINE
CYSTINE SULFITOLYSIS
ESPECTROMETRIA
ESPECTROSCOPIA INFRARROJA
ESTANO
ETAIN
FOURIER TRANSFORM
INFRARED SPECTROPHOTOMETRY
LAINE
LANA
ORGANOSULPHUR COMPOUNDS
QUANTITATIVE ANALYSIS
REACCIONES QUIMICAS
REACTION CHIMIQUE
SPECTRAL ANALYSIS
SPECTRAL DATA
SPECTROMETRIE
SPECTROMETRY
SPECTROSCOPIE INFRAROUGE
SULFONATES
TECHNIQUE ANALYTIQUE
TECNICAS ANALITICAS
TIN
WOOL
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Summary: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.
ISSN:0040-5175
1746-7748
DOI:10.1177/004051759706700602