Reseda luteola (Weld) extracts were used to dye textiles and decorate medieval manuscripts. The main components are luteolin and apigenin in the form of β-glucosides, having an important role in plant UV protection, coloration and defense. Luteolin and apigenin have anti-oxidant, anticarcinogenic, anti-inflammatory and anti-bacterial properties. The present study investigates the degree of exhaust of dyestuff extract of Weld in the dyeing process of cotton fabrics premordanted with mimosa tannin and tannin/alum, the antibacterial and UV protective effects of dyed fabrics. The UV-Vis spectra of the dye solution demonstrated the presence of luteolin-7, 3'di-O'-glucoside as the main compound. The highest dye exhaustion in the dye bath is attained for the cotton pre-mordanted with 8% Mimosa and 15% Alum, probably due to the complex formed between the flavonoids components and Al 3+ ions. While the ultraviolet protection factor (UPF) for the untreated cotton knit is 10, indicating the lack of protection against UV radiation, all the mordanted and dyed fabrics show an excellent protection (UPF >50+) due to the UV high absorbance of tannins and Reseda luteola components. The only samples demonstrating a satisfactory antibacterial effect against S. Aureus are the fabrics pre-mordanted with mimosa tannin and alum and dyed with Reseda luteola extract.
Modern world environmental challenges dictate the need for obtaining of alternative materials in various industrial sectors. Filamentous fungi strains are complex microorganisms that are able to produce rich enzymes batteries that are able of breaking down a wide variety of organic substrates. Present work explored the potential of Fusarium oxysporum strain for creating a novel biocomposite structure, based on an alternative substrate, composed of recycled shredded paper and worn coffee. Strain was successfully grown on an alternative nutritive substrate, which allowed formation of a 64.23µm biofilm on the surface of the substrate, and development of a homogenous hyphal matrix inside the aerial structure of the substrate, yielding a high rigidity material. Both optical and SEM analyses revealed even distribution of the hyphae and partial enzymatic hydrolysis of the recycled paper, which acted as a carbon source for cell development. Flammability analysis conducted on the biofilm surface of the material revealed very good fire retardant properties, withstanding close flame contact up to 80 seconds, after which smoldering fire occurred. Preliminary results are promising in exploiting the potential of an important plant pathogen in obtaining high added value materials, based on use of organic wastes which serve a double functionality, with nutritive role and mechanical substrate.
The wood of the Caesalpinia sappan species is the main source of red dyes used for dyeing textiles and paper, stain biological samples, metals identification, as anti-convulsant, immunosuppressant, anti-inflammatory, anti-bacterial and cancer drug. The main component, brazilin is colorless and to obtain a functional dye, it is oxidized to brazilein. The experimental work consisted in dyeing pre-mordanted cotton knit with Brasi-Color, a dyestuff extract of brazilwood. The aim of this research was to evaluate the effectiveness of mimosa tannin and aluminum potassium sulfate on dye exhaustion, the dyeing fastness, the antibacterial efficiency and UV protective effects of pre-mordanted and dyed cotton fabrics. The dyeing fastness is modest and need to be further optimized. The UV-Vis spectra demonstrated the presence of brazilein (λmax: 445nm and 542nm) as the main compound of the dye solution. The highest degree of dye exhaustion was obtained at the lowest concentration of mimosa tannin and alum. All the fabrics show an excellent ultraviolet protection factor (UPF>50+). The fabric pre-mordanted with 2% mimosa/4% alum and dyed with Brasi-Color transmits the lowest amount of UV rays on both UVA and UVB domains. All the dyed fabrics show a good antibacterial effect against S. Aureus.
Cell Solution® Protection fibers are natural cellulosic manmade fibers and provide effective and durable protection against insects-such as ticks and mosquitoes. Cell Solution® Protection fibers can be easily processed into textiles and have consistent dyeability whan following the recommended processing/finishing method. Permethrin is a chemical categorized in the pyrethroid, insecticide group. Permethrin is used as an insecticide in agriculture or as a personal protective measure (cloth impregnant, used primarily for US military uniforms and mosquito nets). The objective of this work was the determination of Permethrin from functionalized textile materials. Permethrin has four stereoisomers (two enantiomeric pairs), arising from the two stereocenters in the cyclopropane ring. (1R,3S)-trans and (1R,3R)-cis enantiomers are responsible for the insecticidal properties of permethrin. We performed the extraction of Permethrin from textile materials using accelerated solvent extraction (ASE), followed by identification of permethrin and cuantification by liquid chromatography with spectrophotometric detection (HPLC-MWD) and we confirmed the results by gas chromatography with mass spectrometric detection (GC-MS). Both analytical methods have contributed to determination of trans and cispermethrin.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.