Abstract
Curcuma longa rhizome (turmeric), walnut, and henna are medicinal plants which are traditionally used for fiber colorations. In this study, the viscose rayon fabrics were dyed with different mordant at a variety of conditions. The dyed fabric and treated fabric with Ag nanoparticles were evaluated for antibacterial activity against pathogenic strain of Gram-negative (Escherichia coli) bacteria. Durability of antibacterial activity to laundering was also investigated. The results indicated that treated fabrics with these natural dyes had excellent antibacterial activity as well as Ag nanoparticles before and after wash.
Highlights
Metal nanoparticles exhibit unique chemical and physical properties including large surface/volume ratio, which is useful in different fields such as electronics, photonics, biomedical, catalysis, etc [1]
The color of S. officinale extract was changed from pale yellow to light brown in 10 min, which resembles the synthesis of AgNPs, as the particles cause surface plasmon resonance (SPR) due to which light brown color appears in the supernatant
In the UV–Vis absorption spectrum, a strong peak appeared at 468 nm for AgNPs synthesized from S. officinale (S-AgNPs), which is due to the SPR band of AgNPs (Fig. 1a)
Summary
Metal nanoparticles exhibit unique chemical and physical properties including large surface/volume ratio, which is useful in different fields such as electronics, photonics, biomedical, catalysis, etc [1]. Many standard approaches by means of physical and chemical have been used for the preparation of silver nanoparticles (AgNPs) by several researchers. The green synthesis approach provides most advantages over the chemical and physical method as it is fast, cost-effective, eco-friendly and easy to scale up for large-scale synthesis without applying high energy, high pressure, high temperature and toxic chemicals [6]. Many researchers have employed different plant parts such as root, stem, bark, leaf, fruit, bud, and latex for the synthesis of AgNPs [7,8,9,10]. Reports have suggested that nanoparticles synthesized from medicinal plants have been found to be pharmacologically active and stable, but no hazardous by-products or toxic chemicals are used in their synthesis [11]. As a green approach for the first time, we report the use of Symphytum officinale (Comfrey) leaf extract for the synthesis of AgNPs and further investigating their role in protection against UVBinduced photoaging
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