The Direct Measurement of the Forces of Interaction between a Colloid Particle and an Oil Droplet

Mulvaney, Paul; Perera, Jilska M.; Biggs, Simon; Grieser, Franz; Stevens, Gary

doi:10.1006/jcis.1996.0588

Cited by 111 publications

(96 citation statements)

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“…It is observed that the band corresponding to surface plasmon resonance occurs at 410 nm, which clearly indicates the formation of AgNPs in the reaction mixture. 33,[36][37][38][39][40] Similarly, Anthony et al reported AgNPs derived from culture supernatant of Bacillus mariflavi. 7 Mukherjee et al demonstrated synthesis of AgNPs using culture filtrate of Verticillium.…”

Section: Results and Discussion Synthesis And Characterization Of B-amentioning

confidence: 97%

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Gurunathan¹,

Park²,

Han³

et al. 2015

IJN

272

151

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Background Recently, the use of nanotechnology has been expanding very rapidly in diverse areas of research, such as consumer products, energy, materials, and medicine. This is especially true in the area of nanomedicine, due to physicochemical properties, such as mechanical, chemical, magnetic, optical, and electrical properties, compared with bulk materials. The first goal of this study was to produce silver nanoparticles (AgNPs) using two different biological resources as reducing agents, Bacillus tequilensis and Calocybe indica. The second goal was to investigate the apoptotic potential of the as-prepared AgNPs in breast cancer cells. The final goal was to investigate the role of p53 in the cellular response elicited by AgNPs. Methods The synthesis and characterization of AgNPs were assessed by various analytical techniques, including ultraviolet-visible (UV-vis) spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, dynamic light scattering (DLS), and transmission electron microscopy (TEM). The apoptotic efficiency of AgNPs was confirmed using a series of assays, including cell viability, leakage of lactate dehydrogenase (LDH), production of reactive oxygen species (ROS), DNA fragmentation, mitochondrial membrane potential, and Western blot. Results The absorption spectrum of the yellow AgNPs showed the presence of nanoparticles. XRD and FTIR spectroscopy results confirmed the crystal structure and biomolecules involved in the synthesis of AgNPs. The AgNPs derived from bacteria and fungi showed distinguishable shapes, with an average size of 20 nm. Cell viability assays suggested a dose-dependent toxic effect of AgNPs, which was confirmed by leakage of LDH, activation of ROS, and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive cells in MDA-MB-231 breast cancer cells. Western blot analyses revealed that AgNPs induce cellular apoptosis via activation of p53, p-Erk1/2, and caspase-3 signaling, and downregulation of Bcl-2. Cells pretreated with pifithrin-alpha were protected from p53-mediated AgNPs-induced toxicity. Conclusion We have demonstrated a simple approach for the synthesis of AgNPs using the novel strains B. tequilensis and C. indica , as well as their mechanism of cell death in a p53-dependent manner in MDA-MB-231 human breast cancer cells. The present findings could provide insight for the future development of a suitable anticancer drug, which may lead to the development of novel nanotherapeutic molecules for the treatment of cancers.

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Section: Results and Discussion Synthesis And Characterization Of B-amentioning

confidence: 97%

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Gurunathan¹,

Park²,

Han³

et al. 2015

IJN

272

151

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“…The interaction of a particle with an oil drop is relatively similar to that with an air bubble [872][873][874]. Both interfaces, the oil-water and the water-gas interface, are negatively charged at neutral pH.…”

Section: Particle-bubble Interactionmentioning

confidence: 98%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,204

2,949

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“…Although the heterocoagulation of fine particles and non-polar oil droplet in aqueous solution has been reported [20,47], little information has been reported regarding the heterocoagulation of ultra-fine particles and non-polar oil droplet in organic solvent that is eventually the heart of the proposed two-liquid flotation. Thus, it is important to understand and investigate such heterocoagulation to extract its science and give a better feedback to the engineering of ultra-fine particle separation by two-liquid flotation.…”

Section: Heterocoagulation Of Particle and Non-polar Oil Dropletmentioning

confidence: 99%

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

Otsuki

Dodbiba

Fujita

2018

Colloids and Interfaces

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This paper reviews two separation methods applying two-step two-liquid flotation for recovering ultra-fine rare earth fluorescent powders (i.e., red, green, and blue). The paper aims to extract the science behind separation by two-liquid flotation, and to provide resulting engineering tips for material recycling. Two-liquid flotation, also called liquid-liquid extraction, involves two solvents (i.e., non-polar and polar solvents) to capture hydrophobic/hydrophobized particles at their interface, and a surfactant to selectively modify the surface property of the target powder(s). For separating a three powder mixture, two different developed flowsheets, composed of two-step separation are discussed. The major difference found was the polar solvents used. The first flowsheet (called the aqueous-organic system) employed water as a polar solvent while the second flowsheet (called the organic-organic system) utilized N,N-dimethylformamide, DMF as a polar solvent. The organic-organic system at the optimized conditions achieved both the grade and recovery of all the separated fluorescent powders at greater than 90% while the aqueous-organic system did not satisfy these criteria. This paper also reviews the mechanism behind the separation, as well as performing a cost comparison between the two methods. The cost comparison indicates that the organic-organic system is a more cost effective method for recovering rare earth fluorescent powders than the aqueous-organic system. Since the size of powders (i.e., several µm) is too small for the application of conventional separation technologies (e.g., froth flotation), two-liquid flotation is a unique pathway for the material recycling of ultra-fine rare earth fluorescent powders.

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The Direct Measurement of the Forces of Interaction between a Colloid Particle and an Oil Droplet

Cited by 111 publications

References 0 publications

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Force measurements with the atomic force microscope: Technique, interpretation and applications

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

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The Direct Measurement of the Forces of Interaction between a Colloid Particle and an Oil Droplet

Cited by 111 publications

References 0 publications

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in&nbsp;MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in&nbsp;MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Force measurements with the atomic force microscope: Technique, interpretation and applications

Two-Liquid Flotation for Separating Mixtures of Ultra-Fine Rare Earth Fluorescent Powders for Material Recycling—A Review

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Product

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Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy

Comparative assessment of the apoptotic potential of silver nanoparticles synthesized by Bacillus tequilensis and Calocybe indica in MDA-MB-231 human breast cancer cells: targeting p53 for anticancer therapy