Changing the shape of wool yarns via laccase-mediated grafting of tyrosine

Autor: Carla Silva, Su Jing, Madalena Martins, Yu Li, Artur Cavaco-Paulo, Jennifer Noro
Přispěvatelé: Universidade do Minho
Rok vydání: 2021
Předmět:
Zdroj: Repositório Científico de Acesso Aberto de Portugal
Repositório Científico de Acesso Aberto de Portugal (RCAAP)
instacron:RCAAP
ISSN: 0168-1656
Popis: The shape of wool yarns was changed by laccase-assisted grafting of tyrosine. Prior to tyrosine grafting a cysteine pre-treatment was optimized aiming to increase the amount of thiol reaction groups available. The best operational conditions for laccase-assisted tyrosine grafting were: i) pre-treatment with cysteine (2.2 mM) in a solution of 20 % ethanol, 15 % propylene glycol and 0.5 % benzyl alcohol, pH=10, 40 °C; ii) tyrosine grafting with 3.0 mM tyrosine, 18 U/mL laccase, pH=5, 40 °C. The shape modification was evaluated by number of curly twists determination on the grafted yarn samples. The thermal and mechanical properties of the grafted wool yarns was evaluated by TGA, DSC and breaking strength determination. The amount of free thiols and weight gain were assessed aiming to infer the role of the cysteine pre-treatment on the final tyrosine grafting and shape modification. The laccase-assisted grafting of tyrosine onto wool yarns have influenced the thermal and mechanical properties of the yarns however without compromising their structural integrity for the final application purposes. The developed methodology to impart new shape to wool yarns is presented herein as an environmentally friendly alternative to chemical methods. The new findings revealed great potentialities for application in similar fibers like hair.
This study was supported by Chinese Government Scholarship under China Scholar Council [NO. 201906790043] and “the National Nature Science Foundation of China [Grant NO. 52003108]. This study was also supported by the Portuguese Foundation for Science and Technology (FCT) under the scope of the strategic funding of UIDB/04469/2020 unit and BioTecNorte operation [Norte-01-0145-FEDER-000004] funded by the European Regional Development Fund under the scope of Norte2020 – Programa Operacional Regional do Norte. Jennifer Noro thanks to FCT for the funding [grand number SFRH/BD/121673].
info:eu-repo/semantics/publishedVersion
Databáze: OpenAIRE
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