scholarly journals Optical Properties andIn VitroBiological Studies of Oligonucleotide-Modified Quantum Dots

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Valérie A. Gérard ◽  
Mark Freeley ◽  
Eric Defrancq ◽  
Anatoly V. Fedorov ◽  
Yurii K. Gun’ko
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Biological Imaging ◽  
Water Soluble ◽  
Biological Applications ◽  
Potential Applications ◽  
Biochemical Mechanisms

Water-soluble semiconducting nanocrystals or quantum dots (QDs) have attracted much interest in recent years due to their tuneable emission and potential applications in photonics and biological imaging. Fluorescence resonance energy transfer (FRET) processes are very important for elucidating biochemical mechanismsin vitro, and QDs constitute an excellent substrate for this purpose. In this work, new oligonucleotide-functionalised CdTe-based QDs were prepared, characterised and biologically tested. These QDs demonstrated interesting optical properties as well as remarkablein vitrobehaviour and potential for a range of biological applications.

scholarly journals Biological nanoscale fluorescent probes: From structure and performance to bioimaging

2020 ◽  
Vol 39 (1) ◽  
pp. 209-221
Author(s):  
Jiafeng Wan ◽  
Xiaoyuan Zhang ◽  
Kai Zhang ◽  
Zhiqiang Su
Keyword(s):  
Fluorescent Probes ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
High Sensitivity ◽  
Biological Imaging ◽  
Fluorescent Materials ◽  
And Performance

Abstract In recent years, nanomaterials have attracted lots of attention from researchers due to their unique properties. Nanometer fluorescent materials, such as organic dyes, semiconductor quantum dots (QDs), metal nano-clusters (MNCs), carbon dots (CDs), etc., are widely used in biological imaging due to their high sensitivity, short response time, and excellent accuracy. Nanometer fluorescent probes can not only perform in vitro imaging of organisms but also achieve in vivo imaging. This provides medical staff with great convenience in cancer treatment. Combined with contemporary medical methods, faster and more effective treatment of cancer is achievable. This article explains the response mechanism of three-nanometer fluorescent probes: the principle of induced electron transfer (PET), the principle of fluorescence resonance energy transfer (FRET), and the principle of intramolecular charge transfer (ICT), showing the semiconductor QDs, precious MNCs, and CDs. The excellent performance of the three kinds of nano fluorescent materials in biological imaging is highlighted, and the application of these three kinds of nano fluorescent probes in targeted biological imaging is also introduced. Nanometer fluorescent materials will show their significance in the field of biomedicine.

Tuning optical properties of water-soluble CdTe quantum dots for biological applications

2017 ◽  
Vol 19 (2) ◽  
Author(s):  
Anne S. Schulze ◽  
Isabella Tavernaro ◽  
Friederike Machka ◽  
Olga Dakischew ◽  
Katrin S. Lips ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Water Soluble ◽  
Cdte Quantum Dots ◽  
Biological Applications

FLUORESCENCE RESONANCE ENERGY TRANSFER BETWEEN DYES AND WATER-SOLUBLE QUANTUM DOTS WITH AVIDIN AS A BRIDGE

2004 ◽  
Vol 03 (03) ◽  
pp. 273-280
Author(s):  
QI-DAN CHEN ◽  
ZHANG-BI LIN ◽  
XING-GUANG SU ◽  
HAO ZHANG ◽  
XIAO-HONG HE ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Fluorescence Resonance Energy Transfer ◽  
Resonance Energy Transfer ◽  
Fluorescence Emission ◽  
Resonance Energy ◽  
Water Soluble ◽  
Fluorescence Emission Spectrum ◽  
Fluorescence Characteristics ◽  
Fluorescence Resonance

3-Mercaptopropyl acid-capped quantum dots (QDs) synthesized in aqueous solution were coupled to avidin-sulforhodamine, also named avidin-Texas red (ATR), via electrostatic attraction. An intensity reduction in the fluorescence emission spectrum of QDs and an enhanced fluorescence intensity of the dye were observed on account of fluorescence resonance energy transfer from the QD donors to the dye acceptors. In addition, the fluorescence characteristics of the QD-ATR conjugates were strongly-related to the quantity of ATR, pH value and ionic strength.

Synthesis and optical properties of water soluble CdSe/CdS quantum dots for biological applications

2012 ◽  
Vol 3 (2) ◽  
pp. 025017 ◽  
Author(s):  
Viet Ha Chu ◽  
Thi Ha Lien Nghiem ◽  
Tien Ha Le ◽  
Dinh Lam Vu ◽  
Hong Nhung Tran ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Water Soluble ◽  
Biological Applications ◽  
Cds Quantum Dots

scholarly journals Electrostatically driven resonance energy transfer in “cationic” biocompatible indium phosphide quantum dots

2017 ◽  
Vol 8 (5) ◽  
pp. 3879-3884 ◽  
Author(s):  
Gayathri Devatha ◽  
Soumendu Roy ◽  
Anish Rao ◽  
Abhik Mallick ◽  
Sudipta Basu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Indium Phosphide ◽  
Metal Ion ◽  
Resonance Energy Transfer ◽  
Toxic Metal ◽  
Resonance Energy ◽  
Biological Applications ◽  
The Family ◽  
Cationic Nanoparticles

InP QDs join the family of cationic nanoparticles as a practical alternative to toxic metal ion based QDs for biological applications.

Nanoparticle Fluorescence Based Technology for Biological Applications

2008 ◽  
Vol 8 (3) ◽  
pp. 1019-1051 ◽  
Author(s):  
Wei Chen
Keyword(s):  
Upconversion Luminescence ◽  
Resonance Energy ◽  
Volume Ratio ◽  
Water Soluble ◽  
Biological Applications ◽  
Quantum Size ◽  
Luminescent Nanoparticles ◽  
Photo Stability

Fluorescence is widely used in biological detection and imaging. The emerging luminescent nanoparticles or quantum dots provide a new type of biological agents that can improve these applications. The advantages of luminescent nanoparticles for biological applications include their high quantum yield, color availability, good photo-stability, large surface-to-volume ratio, surface functionality, and small size. In this review article, we first introduce quantum size confinement, photoluminescence and upconversion luminescence of nanoparticles, then describe the preparation and conjugation of water soluble nanoparticles and introduce the applications of luminescence nanoparticles for in vitro and in vivo imaging, fluorescence resonance energy based detection, and the applications of luminescence nanoparticles for photodynamic activation.

scholarly journals Energy transfer in complexes of water-soluble quantum dots and chlorin e6 molecules in different environments

2013 ◽  
Vol 4 ◽  
pp. 895-902 ◽  
Author(s):  
Irina V Martynenko ◽  
Anna O Orlova ◽  
Vladimir G Maslov ◽  
Alexander V Baranov ◽  
Anatoly V Fedorov ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Energy Transfer ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Covalent Bonding ◽  
Water Soluble ◽  
Chlorin E6 ◽  
Track Membranes ◽  
Formation Conditions

The photoexcitation energy transfer is found and investigated in complexes of CdSe/ZnS cationic quantum dots and chlorin e6 molecules formed by covalent bonding and electrostatic interaction in aqueous solution and in porous track membranes. The quantum dots and chlorin e6 molecules form stable complexes that exhibit Förster resonance energy transfer (FRET) from quantum dots to chlorin e6 regardless of complex formation conditions. Competitive channels of photoexcitation energy dissipation in the complexes, which hamper the FRET process, were found and discussed.

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