Sensing of reactive oxygen species by self-aggregating gold nanoparticle assemblies

Yasmin, Zannatul; Catala, Alexis; Maswadi, Saher; Nash, Kelly; Glickman, Randolph D.

doi:10.1016/b978-0-323-41533-0.00005-2

Cited by 2 publications

(2 citation statements)

References 61 publications

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“…2, reaction 2). Furthermore, the oxidation of citrate to dicarboxy acetone, acetone or other products upon heating or in the presence of metal ions has been described in the literature (Jiang et al 2009;Bartosewicz et al 2018;Khan et al 2012;Yasmin et al 2016;Tuner et al 2010). This occurs when citrate ions are decomposed through the microwave irradiation to form dicarboxy acetone (Fig.…”

Section: Resultsmentioning

confidence: 99%

Using microwave irradiation to catalyze the in-situ manufacturing of silver nanoparticles on cotton fabric for antibacterial and UV-protective application

Barani

Mahltig

2020

Cellulose

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Antibacterial and UV-protective cotton fabrics were produced with an in-situ synthesis of silver nanoparticles using trisodium citrate as reductive agent and microwave irradiation for starting the synthesis reaction. The creation of silver nanoparticles with different morphologies such as quasi-spherical and cubic nanoparticles was confirmed by the SEM images. The EDS pattern of the loaded sample confirmed the uniform silver loading on the surface of cotton fibers as well as their crystal structure was approved by the X-ray diffraction pattern. Increasing reaction temperature (80, 100, 120, and 140°C) caused a significant decrease up to 75% in the average diameter of nanoparticles and narrowing the size distribution. Also, increasing amounts of trisodium citrate (0, 100, 200, and 400 ppm) in the synthesizing solution resulted in a decrease up to of 59% in the average diameter and prevented agglomeration of nanoparticles. The FTIR spectra confirmed that the highest absorbed water in the loaded cotton samples was achieved in the highest concentration of trisodium citrate. The antibacterial properties of loaded cotton samples significantly depended on the reaction temperature as well as trisodium citrate concentration. The loaded cotton fabrics showed active antibacterial properties with inhibition zones of 16-18.5 mm against the Gram-positive Staphylococcus aureus and the Gram-negative Escherichia coli. Moreover, the prepared AgNP cotton fabrics demonstrated excellent UV-rays blocking properties with a high rate of ultraviolet protection factor value.

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Section: Resultsmentioning

confidence: 99%

Using microwave irradiation to catalyze the in-situ manufacturing of silver nanoparticles on cotton fabric for antibacterial and UV-protective application

Barani

Mahltig

2020

Cellulose

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“…[9][10][11][12][13][14][15] Photoacoustic sensitivity can be greatly enhanced by the use of contrast agents such as metal nanoparticles, which have a strong photoacoustic response and have proven to be useful in both imaging and sensing applications. [16][17][18] The flexibility, speed, and sensitivity of photoacoustic technologies make them suitable for a variety of applications, including ocular imaging and sensing.…”

Section: Introductionmentioning

confidence: 99%

Photoacoustic Imaging and Sensing: A New Way to See the Eye

Glickman

2021

Journal of Ocular Pharmacology and Therapeutics

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Purpose: Photoacoustics (optoacoustics) is a hybrid technology utilizing light excitation of acoustic responses in targets of interest. It has found numerous applications in biomedicine, including eye research, because of its ability to report both morphological and functional data about the interrogated tissue. This presentation will give an overview of current applications. Methods: Wavelength-dependent absorption of light in a tissue chromophore causes local heating, leading to a thermoelastic expansion-contraction cycle. If nanosecond pulses of light are used to excite this process, the resulting pressure wave is an ultrasound signal propagating through the tissue and detectable at the tissue surface. This is highly advantageous because of the known properties of ultrasound propagation in tissue and the ability to use standard, medical ultrasound equipment for detection. The time of arrival and amplitude of ultrasound signals provide information about the location and nature of the absorber. Results: Due to the wavelength dependence of the photoacoustic response, functional and physiological applications are possible. For example, retinal oximetry can be determined from the different optical absorption properties of oxy-and deoxyhemoglobin. Multispectral imaging of the posterior segment can identify pigments such as melanin or lipofuscin or the nature of foreign bodies. The technique can be combined with other imaging modalities such as ultrasound and optical coherence tomography to produce high-resolution images of retinal structures along with functional information. Conclusion: Photoacoustic technology is a powerful noninvasive tool for ocular research and to study ocular morphology, fundamental physiological parameters, cellular responses, and molecular expression.

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Sensing of reactive oxygen species by self-aggregating gold nanoparticle assemblies

Cited by 2 publications

References 61 publications

Using microwave irradiation to catalyze the in-situ manufacturing of silver nanoparticles on cotton fabric for antibacterial and UV-protective application

Using microwave irradiation to catalyze the in-situ manufacturing of silver nanoparticles on cotton fabric for antibacterial and UV-protective application

Photoacoustic Imaging and Sensing: A New Way to See the Eye

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