Photochemical formation of chitosan-stabilized near-infrared-absorbing silver Nanoworms: A “Green” synthetic strategy and activity on Gram-negative pathogenic bacteria

Marpu, Sreekar B.; Kolailat, Samar S.; Korir, Daniel K.; Kamras, Brian Leon; Chaturvedi, Rekha; Joseph, Abel; Smith, Christopher M.; Palma, Misael C.; Shah, Jyoti; Omary, Mohammad A.

doi:10.1016/j.jcis.2017.08.009

Cited by 17 publications

(12 citation statements)

References 77 publications

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“…Various studies have been reported that AgNPs are able to suppress many bacterial phytopathogens, such as Acidovorax oryzae strain RS-2 [22], Clavibacter michiganensis subspecies michiganensis [23], and Pseudomonas syringae pv. tomato DC 3000 [24]. Green AgNPs, synthesized by using bacteria of the genus Bacillus, including Bacillus megaterium, Bacillus cereus, Bacillus amyloliquefaciens, Bacillus flexus, and Bacillus subtilis, have been widely studied and have a sustainable nature [18,25]; however, none of these Bacillus spp.…”

Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles Synthesized by Using Bacillus cereus SZT1 Ameliorated the Damage of Bacterial Leaf Blight Pathogen in Rice

et al. 2020

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Amongst serious biotic factors deteriorating crop yield, the most destructive pathogen of rice is Xanthomonas oryzae pv. oryzae (Xoo), which causes bacterial leaf blight (BLB) disease. This study involved targeted use of biogenic silver nanoparticles (AgNPs) to control BLB in order to cope with the disadvantages of chemical disease control. AgNPs were biologically synthesized from natively isolated Bacillus cereus strain SZT1, which was identified through 16S rRNA gene sequence analysis. Synthesis of AgNPs in bacterial culture supernatant was confirmed through UV-VIS spectroscopy. Fourier transform infrared spectroscopy (FTIR) confirmed that the existence of AgNPs was stabilized with proteins and alcoholic groups. X-ray diffraction (XRD) data revealed the crystalline nature and imaging with scanning electron microscopy (SEM) and transmission electron microscopy (TEM), showing the spherical shape of AgNPs with particle sizes ranging from 18 to 39 nm. The silver presence in AgNPs was further confirmed by energy dispersive spectra. Biogenic AgNPs showed substantial antibacterial activity (24.21 ± 1.01 mm) for Xoo. In a pot experiment, AgNPs were found to be effective weapons for BLB by significantly increasing the plant biomass with a decreased cellular concentration of reactive oxygen species and increased concentration of antioxidant enzyme activity.

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Section: Introductionmentioning

confidence: 99%

Silver Nanoparticles Synthesized by Using Bacillus cereus SZT1 Ameliorated the Damage of Bacterial Leaf Blight Pathogen in Rice

et al. 2020

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“…The low dispersity is beneficial for biological studies, where size dispersity affects the cytotoxicity of nanoparticle therapies [25][26][27].…”

Section: Resultsmentioning

confidence: 99%

Formula-Driven, Size-Tunable Synthesis of PMMA Nanoparticles by Varying Surfactant Concentration

et al. 2020

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In this communication, we present a streamlined, reproducible synthetic method for the production of size-tunable poly(methyl methacrylate) (PMMA) nanoparticles (PMMANPs) and amine-functionalized block-copolymer PMMANPs (H2N-PMMANPs) by varying subcritical concentrations (i.e., below the concentration required to form micelles at 1 atm and 20 °C) of sodium dodecyl sulfate (SDS). We plotted the Z-average size data against SDS concentration, which revealed a second-order exponential decay function, expressed as A 1 e − x t 1 + A 2 e − x t 2 + y 0 . The surfactant concentration (wt./wt.%) has been selected as independent variable x. This function is valid at least for the size range of 20 nm to 97 nm (PMMANPs) and 20 nm to 133 nm (H2N-PMMANPs).

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“…Closer inspection of these chitin nanocones shows these structures—akin to the previously-described synthetic polymer structures—have secondary finer nanoscale structures (longitudinal ridges) along the length of the nanocones ( Figure 3 B, inset arrows). We suspect that like the synthetic polymers, these longitudinal nano-ridges are a product of the interaction of the reactive ions and nanoscale structure within the chitin fiber [ 14 ]. Chitin nanofibers in natural systems range in size from 2 nm to 10 nm, depending on the context [ 4 , 15 , 17 ].…”

Section: Resultsmentioning

confidence: 99%

“…Due to the presence of stabilizing and reducing components within their composition, chitin and chitosan have been used for the generation of silver nanoparticles (AgNP) [ 14 ]. One of the scaling limitations of colloidal/nanosphere lithography is the masking step.…”

Section: Resultsmentioning

confidence: 99%

“…This limitation is largely due to the difficulty of generating large areas of the nanosphere mask [ 9 , 10 ]. In this paper, we utilize a property of chitin and chitosan—the ability of these polymers to generate silver nanoparticles (AgNP) [ 14 ]—as a means to bypass the application of the nanosphere of the substrate in the traditional NSL process. Using a drop-cast chitosan/AgNP as a self-masking thin-film etching substrate, we generated a nanostructured AgNP/chitosan surface.…”

Section: Introductionmentioning

confidence: 99%

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Nanosphere Lithography of Chitin and Chitosan with Colloidal and Self-Masking Patterning

2018

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Complex surface topographies control, define, and determine the properties of insect cuticles. In some cases, these nanostructured materials are a direct extension of chitin-based cuticles. The cellular mechanisms that generate these elaborate chitin-based structures are unknown, and involve complicated cellular and biochemical “bottom-up” processes. We demonstrated that a synthetic “top-down” fabrication technique—nanosphere lithography—generates surfaces of chitin or chitosan that mimic the arrangement of nanostructures found on the surface of certain insect wings and eyes. Chitin and chitosan are flexible and biocompatible abundant natural polymers, and are a sustainable resource. The fabrication of nanostructured chitin and chitosan materials enables the development of new biopolymer materials. Finally, we demonstrated that another property of chitin and chitosan—the ability to self-assemble nanosilver particles—enables a novel and powerful new tool for the nanosphere lithographic method: the ability to generate a self-masking thin film. The scalability of the nanosphere lithographic technique is a major limitation; however, the silver nanoparticle self-masking enables a one-step thin-film cast or masking process, which can be used to generate nanostructured surfaces over a wide range of surfaces and areas.

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Photochemical formation of chitosan-stabilized near-infrared-absorbing silver Nanoworms: A “Green” synthetic strategy and activity on Gram-negative pathogenic bacteria

Cited by 17 publications

References 77 publications

Silver Nanoparticles Synthesized by Using Bacillus cereus SZT1 Ameliorated the Damage of Bacterial Leaf Blight Pathogen in Rice

Silver Nanoparticles Synthesized by Using Bacillus cereus SZT1 Ameliorated the Damage of Bacterial Leaf Blight Pathogen in Rice

Formula-Driven, Size-Tunable Synthesis of PMMA Nanoparticles by Varying Surfactant Concentration

Nanosphere Lithography of Chitin and Chitosan with Colloidal and Self-Masking Patterning

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