scholarly journals Selective recognition of ATP by multivalent nano-assemblies of bisimidazolium amphiphiles through “turn-on” fluorescence response

2020 ◽  
Vol 16 ◽  
pp. 2728-2738
Author(s):  
Rakesh Biswas ◽  
Surya Ghosh ◽  
Shubhra Kanti Bhaumik ◽  
Supratim Banerjee
Keyword(s):  
Self Assembly ◽  
Alkyl Chain ◽  
Ph Value ◽  
Aqueous Media ◽  
Green Emission ◽  
Selective Recognition ◽  
Atp Binding ◽  
Surface Charges ◽  
Turn On ◽  
Efficient Detection

Bisimidazolium receptors, tagged with chromophoric pyrene at one end and linked to an n-alkyl chain at the other, underwent self-assembly in aqueous media depending on the length of the alkyl segment. The amphiphilic derivatives having n-decyl or longer chains, formed nano-assemblies with cyanic–green emission resulting from the stacked pyrene chromophores in the aggregates. The presence of positive surface charges on the multivalent aggregates led to ATP binding which was accompanied by a significant increase in the excimeric emission intensity. This provided a convenient way of monitoring ATP binding in a “turn-on” mode and an efficient detection of ATP was achieved in aqueous buffer and also in buffer containing 150 mM NaCl at physiological pH value. Furthermore, the multivalent aggregates demonstrated a significant selectivity in ATP detection over ADP, AMP and pyrophosphate.

scholarly journals Self-Assembly Hydrosoluble Coronenes: A Rich Source of Supramolecular Turn-On Fluorogenic Sensing Materials in Aqueous Media

2021 ◽  
Author(s):  
Daisy C. Romero ◽  
Patricia Calvo-Gredilla ◽  
José García-Calvo ◽  
Alberto Diez-Varga ◽  
José Vicente Cuevas ◽  
...  
Keyword(s):  
Self Assembly ◽  
Aqueous Media ◽  
Rich Source ◽  
Turn On

pH Tunable Turn on and Turn off Quantum Dots Conjugated with Poly(2-(Dialkylamino)ethyl Methacrylate)

2014 ◽  
Vol 998-999 ◽  
pp. 75-78
Author(s):  
Xian Nan Huang ◽  
Wei Li ◽  
Wei He
Keyword(s):  
Ph Value ◽  
Aqueous Media ◽  
Low Ph ◽  
Ph Sensitive ◽  
Cds Nanoparticles ◽  
Ethyl Methacrylate ◽  
Turn On ◽  
Target Imaging ◽  
Application Potential ◽  
Amine Groups

A novel pH sensitive cadmium sulfide quantum dot (CdS QD) was prepared by a coprecipitation method in the presence of pH sensitive poly (2-(dimethylamino) ethyl methacrylate)-co-poly (2-(dibutylamino) ethyl methacrylate)(PDMA-PDBA) copolymer. CdCl2and Na2S were mixed in aqueous media in the presence of PDMA-PDBA. The amine groups of PDMA were anchored on the surface of the formed CdS nanoparticles, whereas the PDBA segment was anchored on the surface to form a hydrophilic palisade at low pH environment, thus turn on the fluorescence CdS QD probe; at high pH value, PDBA segments precipitate and turn off fluorescence because of the phase separation. This novel pH sensitive fluorescene CdS QDs probe have great application potential for target imaging of cancer.

Pyrrole-coupled salicylimine-based fluorescence “turn on” probe for highly selective recognition of Zn2+ions in mixed aqueous media: Application in living cell imaging

2015 ◽  
Vol 28 (6) ◽  
pp. 369-375 ◽  
Author(s):  
Jitendra Bhosale ◽  
Umesh Fegade ◽  
Banashree Bondhopadhyay ◽  
Simanpreet Kaur ◽  
Narinder Singh ◽  
...  
Keyword(s):  
Living Cell ◽  
Cell Imaging ◽  
Aqueous Media ◽  
Selective Recognition ◽  
Turn On ◽  
Fluorescence Turn On ◽  
Living Cell Imaging

Plasmonics tunable Ag-coated gold nanorods arrays as reusable SERS substrates for multiplexed antibiotics detection

2021 ◽  
Author(s):  
Xiaoya Peng ◽  
Dan Li ◽  
Yuanting Li ◽  
Haibo Xing ◽  
Wei Deng
Keyword(s):  
Gold Nanorods ◽  
Self Assembly ◽  
Aqueous Media ◽  
Antibiotic Residues ◽  
Sers Substrates ◽  
Antibiotics Detection ◽  
Robust Strategies

Antibiotic contaminants in aqueous media pose serious threat to human and ecological environments. Therefore, it is necessary to develop robust strategies to detect antibiotic residues. For this purpose, a self-assembly...

scholarly journals Luminescent Supramolecular Nano- or Microstructures Formed in Aqueous Media by Amphiphile-Noble Metal Complexes

2020 ◽  
Vol 2020 ◽  
pp. 1-24 ◽  
Author(s):  
Carmen Cretu ◽  
Loredana Maiuolo ◽  
Domenico Lombardo ◽  
Elisabeta I. Szerb ◽  
Pietro Calandra
Keyword(s):  
Noble Metal ◽  
Smart Materials ◽  
Self Assembly ◽  
Noble Metals ◽  
Photophysical Properties ◽  
Aqueous Media ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Panoramic View ◽  
Amphiphilic Molecules

The involvement of metal ions within the self-assembly spontaneously occurring in surfactant-based systems gives additional and interesting features. The electronic states of the metal, together with the bonds that can be established with the organic amphiphilic counterpart, are the factors triggering new photophysical properties. Moreover, the availability of stimuli-responsive supramolecular amphiphile assemblies, able to disassemble in a back-process, provides reversible switching particularly useful in novel approaches and applications giving rise to truly smart materials. In particular, small amphiphiles with an inner distribution, within their molecular architecture, of various polar and apolar functional groups, can give a wide variety of interactions and therefore enriched self-assemblies. If it is joined with the opportune presence and localization of noble metals, whose chemical and photophysical properties are undiscussed, then very interesting materials can be obtained. In this minireview, the basic concepts on self-assembly of small amphiphilic molecules with noble metals are shown with particular reference to the photophysical properties aiming at furnishing to the reader a panoramic view of these exciting problematics. In this respect, the following will be shown: (i) the principles of self-assembly of amphiphiles that involve noble metals, (ii) examples of amphiphiles and amphiphile-noble metal systems as representatives of systems with enhanced photophysical properties, and (iii) final comments and perspectives with some examples of modern applications.

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