An ecological and viable approach for the in situ forming silver nanoparticles (AgNPs) on cotton fabrics has been used. Silver nanocoated fabric of brownish yellow color (AgNPs, plasmon color) was characterized by scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR). SEM images revealed that the surface of the modified cotton was rougher than that of normal cotton. In addition, SEM images showed the presence of AgNPs on the surface of the treated fabric. Silver mapping and elemental analysis of the silver nanocoated cotton fabric using EDS confirmed the presence of AgNPs in a homogeneous distribution. Also, FTIR spectra of silver nanocoated sample showed more intense and broad peaks with a slight red shift if compared with those of blank sample indicating the binding of AgNPs with cellulose macromolecules. Different coating levels and the impact of repeated washings have been evaluated against different microbial strains by growth inhibition zone. The results of antimicrobial studies reveal that the presence of a low coating level of nanosilver is enough for producing an excellent and durable antimicrobial cotton fabrics.
The essential oil obtained by hydro-distillation of Aegle marmelos (L.) Correa leaves were analyzed by GC/MS yield (0.9% v/w). Twenty seven components were identified representing 97.76% of the total oil composition. The major components were α-phellenderene (20.97%), α-pinene (17.76%) and δ-carene (16.37%) and other abundant components asγ-cadinene (8.01%), trans-2-hydroxycinnmic acid (6.85%) and β-myrcene (4.32%). The essential oil exhibited significant antibacterial activity against Gram-positive bacteria as Streptococcus faecalis with inhibition zone (30 mm) and Gram-negative bacteria as Pseudomonas aeruginosa (28 mm). Moreover, moderate activity was observed against Bacillus subtilis (23mm), Staphylococcus aureus (23mm), Sarcina lutea (20mm), Arthrobacter citreus (20 mm) and Escherichia coli (25mm) in comparison with antibiotics. The antifungal activity against Aspergillus niger (30 mm) and Candida albicans (30 mm) was higher than the antifungal antibiotics. Moreover, the oil inhibited the germination of Aspergillus niger and Fusarium oxysporum spores at different concentrations.
The
objective of this study is to explore, identify, and evaluate
the bioactive compound extracted from orange peels (OP) via ultrasonic
method as potential eco-friendly agent for multifunctional cellulosic
fabrics/fibers. The innovative strategy involved two approaches. (1)
A closely prepared surface modification procedure for the production
of multifunctional viscose fibers was successfully developed by an
eco-friendly in situ synthesis of Ag, ZnO, and ZnO/Ag nanoparticles
(NPs) using phenolic compounds extracted from OP. The treated viscose
fibers are endowed with remarkable antimicrobial, antioxidant, UV
protection, as well as photo catalytic self-cleaning activity properties.
(2) The microcapsulation and application of limonene extracts from
OP as insect-repellent agent for application in textile field. On
the basis of the resultant promoting data, the OP extract can be considered
as a promising cheap source that can be employed to develop multifunctional
finishing textiles. Therefore, this study introduces a novel simplified
approach to design innovative cellulosic fabrics/fibers as viable
materials for functional sportswear, medical, and fashion clothing
using active extracts from sustainable orange peels.
The current research was focused on the extracellular biosynthesis of bactericidal silver nanoparticles (AgNPs) using cell-free supernatant of a local isolate previously identified as a novel Streptomyces aegyptia NEAE 102. The biosynthesis of silver nanoparticles by Streptomyces aegyptia NEAE 102 was quite fast and required far less time than previously published strains. The produced particles showed a single surface plasmon resonance peak at 400 nm by UV-Vis spectroscopy, which confirmed the presence of AgNPs. Response surface methodology was chosen to evaluate the effects of four process variables (AgNO3 concentration, incubation period, pH levels, and inoculum size) on the biosynthesis of silver nanoparticles by Streptomyces aegyptia NEAE 102. Statistical analysis of the results showed that the linear and quadratic effects of incubation period, initial pH, and inoculum size had a significant effect (p < 0.05) on the biosynthesis of silver nanoparticles by Streptomyces aegyptia NEAE 102. The maximum silver nanoparticles biosynthesis (2.5 OD, at 400 nm ) was achieved in runs number 5 and 14 under the conditions of 1 mM AgNO3 (1-1.5% (v/v)), incubation period (72-96 h), initial pH (9-10), and inoculum size (2-4% (v/v)). An overall 4-fold increase in AgNPs biosynthesis was obtained as compared with that of unoptimized conditions. The biosynthesized silver nanoparticles were characterized using UV-VIS spectrophotometer and Fourier transform infrared spectroscopy analysis, in addition to antimicrobial properties. The biosynthesized AgNPs significantly inhibited the growth of medically important pathogenic gram-positive (Staphylococcus aureus) and gram-negative bacteria (Pseudomonas aeruginosa) and yeast (Candida albicans).
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