Mordant Free Dyeing and Functionalization of Wool Fabrics with Biocolorants Derived from Apocynum venetum L. Bast

Abstract

Biomass has emerged as a sustainable and renewable resource for dyestuff production. There is an increasing interest in biocolorants, especially in pigments from herbs. Nevertheless, hazardous metal mordants need to be used in conventional dyeing procedures to achieve the desired exhaustion rate and colorfastness. In this study, a novel dyeing strategy was presented for wool fibers with flavonoid pigments extracted from the bast of Apocynum venetum L. ( A. venetum ) based on in situ polymerization and covalent fixation of the dyes on the fiber. A new dyeing process was developed using NaOH as a dye fixative in the absence of mordants. The dyed fabric obtained by employing a relatively low NaOH concentration of 1.0 g/L in the dyebath, at a constant dyeing temperature of 100 °C, a dyeing time of 90 min, and a fixation time of 30 min, had a significant improvement in the color strength as well as the antibacterial activity against the assayed microorganisms, in addition to the good rubbing and washing colorfastness. Moreover, it was found that the wool dyed under optimum conditions suffered almost no damage from the tensile test results. This biodyeing strategy provided a new way for the sustainable wool dyeing process.

Washable Patches with Gold Nanowires/Textiles in Wearable Sensors for Health Monitoring

“…The antibacterial activities of AuNW-impregnated cotton fabric and silver ink screen-printed nylon fabric were evaluated through the determination of the bacterial reduction rate . Briefly, four pieces of fabric samples (cotton fabric, AuNW-impregnated cotton fabric, nylon fabric, and silver ink screen-printed nylon fabric) were poured into the 70 mL buffer solution incubated with test organisms and incubated aerobically for 24 h at 37 °C, separately .…”

“…The antibacterial activities of AuNW-impregnated cotton fabric and silver ink screenprinted nylon fabric were evaluated through the determination of the bacterial reduction rate. 41 Briefly, four pieces of fabric samples (cotton fabric, AuNW-impregnated cotton fabric, nylon fabric, and silver ink screen-printed nylon fabric) were poured into the 70 mL buffer solution incubated with test organisms and incubated aerobically for 24 h at 37 °C, separately. 42 Then, 100 μL suspensions of microorganisms (diluted by a 10 −4 gradient) were spread onto the surface of nutrient agar plates and incubated further for 24 or 48 h. The rate expression for bacterial reduction is as follows where N R is the number of bacterial colonies from raw cotton fabric or nylon fabric and N T is the number of bacterial colonies from AuNW-impregnated cotton fabric or silver ink screen-printed nylon fabric.…”

Salt-free reactive dyeing of cotton fibers in a ternary solvent system with different reactive dye chemistry

“…Fourier transform infrared (FTIR) spectra of undyed and dyed cotton samples were measured by the KBr disk method using a FTIR spectrometer (Nicolet iS50, Thermo Scienti c, USA) in the range of 4000-400 cm − 1 (Xu et al, 2020).…”

Sustainable fashion: eco-friendly dyeing of wool fiber with novel mixtures of biodegradable natural dyes

“…The natural dyes not only color but also provide beneficial properties to the textiles 11,12 , such as antibacterial activity, antioxidant activity, and UV resistance. However, the disadvantages of low dye exhaustion percentage and fixation efficiency, especially weak light fastness, hinder its wide application [13][14][15] .To overcome the inherent drawbacks of natural dyeing on a larger scale, mordants (metallic salts) 16,17 such as aluminum potassium sulfate (KAl(SO 4 ) 2 ), stannous chloride (SnCl 2 ), potassium dichromate (K 2 Cr 2 O 7 ), and sodium chromate (Na 2 CrO 4 ) are extensively added in dyeing by pre, simultaneous, or post-mordanting pattern 18,19 to form complexes between the natural dye and fiber. After complexation, the natural dye is stably precipitated in fiber 20 , promoting dye exhaustion, fixation, and colorfastness to washing and rubbing [21][22][23] .…”

“…The natural dyes not only color but also provide beneficial properties to the textiles 11,12 , such as antibacterial activity, antioxidant activity, and UV resistance. However, the disadvantages of low dye exhaustion percentage and fixation efficiency, especially weak light fastness, hinder its wide application [13][14][15] .…”