scholarly journals A study of the interaction of cationic dyes with gold nanostructures

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17694-17703
Author(s):  
Fengyuan Shan ◽  
Luca Panariello ◽  
Gaowei Wu ◽  
Asterios Gavriilidis ◽  
Helen H. Fielding ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Crystal Violet ◽  
Gold Nanoclusters ◽  
Cationic Dyes ◽  
Silver Nanoclusters ◽  
Gold Nanostructures ◽  
Gold Silver

The interaction of methylene blue and crystal violet dyes with a range of gold nanoparticles (AuNPs), gold nanoclusters and gold/silver nanoclusters is reported.

MOFs containing a linear bis-pyridyl-tris-amide and angular carboxylates: exploration of proton conductivity, water vapor and dye sorptions

2019 ◽  
Vol 6 (1) ◽  
pp. 184-191 ◽  
Author(s):  
Satyanarayana K. Konavarapu ◽  
Anindita Goswami ◽  
Anaparthi Ganesh Kumar ◽  
Susanta Banerjee ◽  
Kumar Biradha
Keyword(s):  
Methylene Blue ◽  
Water Vapor ◽  
Proton Conductivity ◽  
Crystal Violet ◽  
Selective Adsorption ◽  
Cationic Dyes ◽  
Adsorption Of Water ◽  
Conductivity Water ◽  
Adsorption Of Water Vapor

Four new MOFs were shown to have appreciable proton conductivities, selective adsorption of water vapor over nitrogen and a tendency to selectively adsorb cationic dyes such as methylene blue and crystal violet.

Application of Biomimetic Nanomaterials in Biological Detection and the Intelligent Recognition Method of Nanoparticle Images

2021 ◽  
Vol 16 (1) ◽  
pp. 23-30
Author(s):  
Ying He
Keyword(s):  
Image Segmentation ◽  
Fluorescent Probe ◽  
Gold Nanoclusters ◽  
Silver Ions ◽  
Silver Nanoclusters ◽  
Dual Function ◽  
Mercury Ions ◽  
Watershed Transformation ◽  
Gold Silver ◽  
Biomimetic Nanomaterials

New nanomaterials (metal nanoclusters, graphene, etc.) are favored by researchers due to their unique properties and are widely used in biomedical detection. The excellent fluorescence characteristics of gold nanoclusters are utilized to develop a fast and highly sensitive bionic nanomaterial with non-label and dual functions, which can detect silver ions and mercury ions and study the particularity of TEM nanoparticle images. The particle segmentation of TEM nanoparticle images is studied to compare the traditional watershed algorithm and watershed transformation algorithm. The experiment results show that silver ions can enhance the fluorescence of gold nanoclusters to form gold-silver nanoclusters with strong yellow fluorescence, and mercury ions can quickly weaken the fluorescence of gold-silver nanoclusters. Based on the biomimetic nanomaterials, a dual-function fluorescent probe is designed to detect silver ions and mercury ions in lake with detection accuracy of 8 nM and 33 nM respectively; the sensing excitation of the fluorescent probe is further analyzed. Because the metal-enhanced fluorescence (MEF) effect enables the silver element and Au nanoparticles to form fluorescence-enhancing effect, the high metalphilic interaction between mercury ions and silver ions quenches the fluorescence effect of gold nanocluster; the rapid watershed transformation/region fusion method can achieve better particle image segmentation combined with the image segmentation algorithms of different TEM nanoparticles, which can be better applied to the characterization analysis of the preparation of gold nanomaterials.

scholarly journals Adsorption Capability of Cationic Dyes (Methylene Blue and Crystal Violet) onto Poly-γ-glutamic Acid

2017 ◽  
Vol 65 (3) ◽  
pp. 268-275 ◽  
Author(s):  
Fumihiko Ogata ◽  
Noriaki Nagai ◽  
Naohito Kawasaki
Keyword(s):  
Methylene Blue ◽  
Glutamic Acid ◽  
Crystal Violet ◽  
Cationic Dyes ◽  
Adsorption Capability

scholarly journals Phytogenic synthesis of gold nanoparticles and applications for removal of methylene blue dye: A review

2021 ◽  
Author(s):  
Harshal Dabhane ◽  
Swati Chatur ◽  
Ghanshyam Jadhav ◽  
Pawan Tambade ◽  
Vijay Medhane
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Phytogenic Synthesis

scholarly journals Gold Nanoparticles: Can They Be the Next Magic Bullet for Multidrug-Resistant Bacteria?

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 312
Author(s):  
Mohammad Okkeh ◽  
Nora Bloise ◽  
Elisa Restivo ◽  
Lorenzo De Vita ◽  
Piersandro Pallavicini ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Bacterial Resistance ◽  
Multidrug Resistant ◽  
World Health ◽  
Resistant Bacteria ◽  
Magic Bullet ◽  
Global Challenge ◽  
Gold Silver ◽  
Inorganic Nanomaterials ◽  
Health Organization

In 2017 the World Health Organization (WHO) announced a list of the 12 multidrug-resistant (MDR) families of bacteria that pose the greatest threat to human health, and recommended that new measures should be taken to promote the development of new therapies against these superbugs. Few antibiotics have been developed in the last two decades. Part of this slow progression can be attributed to the surge in the resistance acquired by bacteria, which is holding back pharma companies from taking the risk to invest in new antibiotic entities. With limited antibiotic options and an escalating bacterial resistance there is an urgent need to explore alternative ways of meeting this global challenge. The field of medical nanotechnology has emerged as an innovative and a powerful tool for treating some of the most complicated health conditions. Different inorganic nanomaterials including gold, silver, and others have showed potential antibacterial efficacies. Interestingly, gold nanoparticles (AuNPs) have gained specific attention, due to their biocompatibility, ease of surface functionalization, and their optical properties. In this review, we will focus on the latest research, done in the field of antibacterial gold nanoparticles; by discussing the mechanisms of action, antibacterial efficacies, and future implementations of these innovative antibacterial systems.

Intracellular mineralization of gold nanoparticles using gold ion-binding peptides with cell-penetrating ability

2021 ◽  
Author(s):  
Makoto Ozaki ◽  
Shuhei Yoshida ◽  
Takaaki Tsuruoka ◽  
Kenji Usui
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanostructures ◽  
Ion Binding ◽  
Cell Penetrating ◽  
Binding Peptides ◽  
Conventional Methods ◽  
Gold Ion

Our method can produce uniquely shaped gold nanostructures in lower HAuCl4 concentration than conventional methods by intracellular functions using peptide assembled structures as a template.

A highly sensitive electrochemical microRNA-21 biosensor based on intercalating methylene blue signal amplification and a highly dispersed gold nanoparticles/graphene/polypyrrole composite

The Analyst ◽  
2021 ◽  
Vol 146 (8) ◽  
pp. 2679-2688
Author(s):  
Chammari Pothipor ◽  
Noppadol Aroonyadet ◽  
Suwussa Bamrungsap ◽  
Jaroon Jakmunee ◽  
Kontad Ounnunkad
Keyword(s):  
Methylene Blue ◽  
Gold Nanoparticles ◽  
Signal Amplification ◽  
Electrochemical Biosensor ◽  
Highly Sensitive ◽  
Highly Dispersed ◽  
Polypyrrole Composite ◽  
Amplification Strategy ◽  
Dispersed Gold ◽  
Potential Tool

An ultrasensitive electrochemical biosensor based on a gold nanoparticles/graphene/polypyrrole composite modified electrode and a signal amplification strategy employing methylene blue is developed as a potential tool for the detection of miRNA-21.

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