http://www.cnr.it/ontology/cnr/individuo/prodotto/ID287701
Xanthoproteic reaction for the evaluation of wool antifelting treatments (Articolo in rivista)
- Type
- Label
- Xanthoproteic reaction for the evaluation of wool antifelting treatments (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.111/cote.1218 (literal)
- Alternative label
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- G. Migliavacca, F. Ferrero, C. Tonin (literal)
- Pagina inizio
- Pagina fine
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
- Editor-in-Chief's recommendation: Uniformity and
reproducibility generally go hand in hand with
successful textile processing. This Feature article
presents a novel way of achieving such goals. It is one
of two papers appearing in this issue of Coloration
Technology that describe work performed by members of
Professor Franco Ferrero's group from Turin. Both concern
the chemistry of wool fibre's outermost structure: the
cuticle. Here they report a new technique to visualise the
application of oxidative treatments to shrinkproof wool.
Ways of doing so using colorants already exist. Deeper test
coloration indicates greater oxidation because dye can
more rapidly penetrate the treated cuticle. However, the
Turin-based researchers report that their method, which
employs a colour reaction instead, has the advantage of
greater differentiation. It relies on nitration of specific
amino acid residues in wool protein to cause yellowing -
a xanthoproteic reaction. Oxidative treatments increase
the accessibility of the innermost parts of the cuticle which
are richer in these residues by attacking the outer layers.
Consequently, the xanthoproteic method not only signals
the extent of the finish but also readily reveals its
levelness. This Feature article therefore demonstrates the
basis for an improved means of securing reliable and
consistent finishing of wool. (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- G. Migliavacca, F. Ferrero, Politecnico di Torino
C. Tonin CNR ISMAC Biella (literal)
- Titolo
- Xanthoproteic reaction for the evaluation of wool antifelting treatments (literal)
- Abstract
- The substances responsible for the yellowing of wool treated with nitric acid are two amino acid constituents
of the fibre: tryptophan and tyrosine. Nitric acid penetrates the fibres and carries out electrophilic aromatic
substitution on the two above-mentioned amino acid residues, producing different colour yields. The intensity
of yellowing depends in various ways on the treatment conditions (time, temperature, nitric acid
concentration, agitation, and liquor ratio). Yellowing evaluation shows abnormal yellowing depending on
acid concentration in the range 5.6-5.9 M. Working in this region makes it possible to use the chromatic
reaction in order to show the damage done to wool fibres by the oxidising agents utilised in normal antifelting
treatments. Wool damage by the oxidants is usually evaluated by dyeing methods based on different affinity
of damaged fibres. By contrast, the xanthoproteic reaction yields chromogens as a function of the
accessibility of tryptophan and tyrosine residues for the action of nitric acid on damaged fibres, and can be
used for assessing the degree of antifelting treatment and its possible unevenness through the development
on the treated wool of a yellow coloration more intense than on untreated wool. (literal)
- Prodotto di
- Autore CNR
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