Browsing by Author "Netithammakorn, Nalinee"

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    Enzyme-based textile coloration
    (2024-06-04) Prajapati, Chetna; Netithammakorn, Nalinee; Smith, Edward; Shen, Jinsong
    Textile coloration is typically characterised as a resource intensive production process that requires the use of large amounts of water, high concentrations of processing chemicals, high temperatures and long processing times, commonly resulting in high energy consumption and effluent waste. Consequently, this has led to rethinking approaches to textile coloration. The research presented gives an overview of current studies that investigated the use of two specific oxidoreductase enzymes, laccase (EC 1.10.3.2) and peroxidase (EC1.11.1.7) to develop a one-step coloration process. Both enzymes are capable of polymerising simple aromatic compounds to form colorants with the potential for textile coloration through the formation of conjugated chromophores via their distinctive catalytic oxidation and coupling/polymerization mechanism. A diverse gamut of hues were achieved on a range of different fibre types (flax, wool and nylon) through enzymatic catalysis of various aromatic compounds as laccase or peroxidase substrates or precursors and alteration of processing parameters such as buffer systems, pH values and reaction times. Enzymatically dyed fabrics were tested against commercial standards, resulting in reasonably good colour fastness to wash. The research demonstrates the potential offered by laccase and peroxidase as transformative tools to replace conventional industrial coloration and surface pattern design processes with biological systems, which offer important advantages of simpler processing using milder conditions that eliminate additional chemical use and reduce energy consumption. The adoption of enzyme-based biotechnologies could help the textile coloration industry transition towards a sustainable future.
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    Peroxidase-catalysed coloration for fabric design with colour patterns
    (2024-06-18) Netithammakorn, Nalinee; Smith, Edward; Lerpiniere, Claire; Shen, Jinsong
    Biotechnology using enzymes has been explored in textile wet processing for potential of reducing chemical, energy and water consumption, due to being highly specific biocatalysts that can operate under mild temperature and neutral pH conditions. The current research study contributes to an understanding of the use of the enzyme peroxidase for textile coloration of wool fabrics as an alternative coloration method to using conventional dyestuff. Peroxidases, belonging to the enzyme group of oxidoreductases, can catalyse oxidation of a wide range of colourless simple aromatic compounds as precursors to form polymeric colourants. This enzymatic coloration can be successfully applied to in-situ dyeing of wool fabrics at a low temperature through peroxidase catalysis of various precursors to achieve a diverse colour palette. It was found that peroxidase can be active over a broad range of pH values to catalyse the synthesis of colourants, resulting in successful coloration of wool fabrics with various colour shades. Peroxidase catalysed coloration of wool fabrics has the potential not only as an alternative coloration process, but also by saving energy and preventing wool fibre damage. To explore the potential of enzymatic coloration for fabric design, colour patterns on fabrics were created using techniques including tie-dyeing and embroidery. Jacquard woven fabrics with different fibre yarns can also show unique colour patterns from subsequent enzymatic dyeing.