Nonionic surfactants and dispersants for biopolishing and stonewashing with Hypocrea jecorina cellulases

Abstract

Cellulases are widely applied in textile finishing, such as for the removal of protruding surface fibrils to reduce pilling propensity and to achieve the worn-out look in denim garments. The main drawback of enzymatic denim processing is the back-staining of indigo, which reduces the desired blue-white contrast. Alongside an accurate selection of the type of cellulase or vigorous post-washing of the garments, the simultaneous application of auxiliaries in the enzymatic treatment may help to reduce backstaining and improve cellulase efficiency. In the present work, the influence of additives such as surfactants and dispersing agents on indigo adsorption and on the treatment of an undyed cotton fabric with Hypocrea jecorina cellulases was investigated. Indigo adsorption was successfully reduced by more than 75% with ethoxylated nonionic surfactants at concentrations below 0.2 g l À1 . The weight loss of cotton fabrics after 120 min treatment was significantly increased with nonionic surfactants and polyvinylpyrrolidone. It could be further shown that protein adsorption on the cotton fabric decreased with the increasing concentration of the additives, while the nonionic surfactants were more efficient than the polyvinylpyrrolidone. Adsorption of a complete cellulase mixture was affected differently by the surfactants than by an exoglucanase-free endoglucanase-rich preparation.

Surfactants in plant disease management: A brief review and case studies

“…Surfactants (derived from "surface active [or acting] agents") decrease interfacial tension formed between a solution and a surface by adsorbing between them and forming micelle clusters in the process (Salager, 2002; Vaidya & Ganguli, 2019; Wade et al, 1978). They have a wide range of applications in the textile, cosmetic, detergent, machine, agriculture, and general science industries (Babajanzadeh et al, 2019; Prieto‐Blanco et al, 2018; Zilz et al, 2012). In chemical protection against plant diseases, surfactants are often added as adjuvants and mixed with the applied pesticides to aid their spread, enabling them to reach the targets of interest (Green, 2000; Horowitz & Givelberg, 1979; Parr & Norman, 1965).…”

“…machine, agriculture, and general science industries (Babajanzadeh et al, 2019;Prieto-Blanco et al, 2018;Zilz et al, 2012). In chemical protection against plant diseases, surfactants are often added as adjuvants and mixed with the applied pesticides to aid their spread, enabling them to reach the targets of interest (Green, 2000;Horowitz & Givelberg, 1979;Parr & Norman, 1965).…”

Understanding the effects of process parameters in the bioscouring of cotton and their interactions on pectate lyase activity by factorial design analysis

“…According to Holmberg (2018), the effect exerted by surfactants differs between the different classes of enzymes, but as a rule, nonionic surfactants are more benign to enzymes than ionic surfactants (anionic and cationic). There are many reports in the recent literature that nonionic surfactants are less harmful, disruptive, and destabilizing to enzyme activity (AMID; MANAP; ZOHDI, 2014;HELLMUTH;DREJA, 2016;ZILZ et al, 2013) since they do not interact with the enzyme through electrostatic attraction (HOLMBERG, 2018).…”

New Laccase-Mediated System Utilized for Bio-Discoloration of Indigo-Dyed Denim Fabrics

“…Enzymes can be used with current equipments and facilities in this industry without the need for retooling, and this is an important point that demonstrates the effectiveness of using enzymes in the industry to discolorize denim [30][31][32][33][34][35]. Moreover, enzymes are among the materials that are well compatible with the environment, so their use causes fewer environmental problems and leads to higher immunity and safety [36,37].…”

“…By degrading the surface piles, this enzyme produces a fabric with a smoother surface, and by degrading the surface of the fabric, it improves hanging [33,[38][39][40]. The cellulase enzyme, by breaking the polymer chain of the cellulose, reduce the tensile strength and rmness of fabric and to some extent it improves exibility [41][42][43].…”