Exploiting the Nanoparticle Plasmon Effect: Observing Drug Delivery Dynamics in Single Cells via Raman/Fluorescence Imaging Spectroscopy

ACS Nano ◽  
2013 ◽  
Vol 7 (8) ◽  
pp. 7420-7427 ◽  
Author(s):  
Bin Kang ◽  
Marwa M. Afifi ◽  
Lauren A. Austin ◽  
Mostafa A. El-Sayed
Keyword(s):  
Drug Delivery ◽  
Fluorescence Imaging ◽  
Single Cells ◽  
Imaging Spectroscopy ◽  
Plasmon Effect

Semiconductor Quantum Dots for Multicolor Fluorescence Imaging and Spectroscopy of Single Cancer Cells

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiaohu Gao ◽  
Shuming Nie ◽  
Wallace H. Coulter
Keyword(s):  
Quantum Dots ◽  
Cancer Cells ◽  
Fluorescence Imaging ◽  
Organic Dyes ◽  
Fluorescent Proteins ◽  
Single Cells ◽  
Quantitative Imaging ◽  
Semiconductor Quantum Dots ◽  
Single Cancer ◽  
Imaging And Spectroscopy

AbstractLuminescent quantum dots (QDs) are emerging as a new class of biological labels with unique properties and applications that are not available from traditional organic dyes and fluorescent proteins. Here we report new developments in using semiconductor quantum dots for quantitative imaging and spectroscopy of single cancer cells. We show that both live and fixed cells can be labeled with multicolor QDs, and that single cells can be analyzed by fluorescence imaging and wavelength-resolved spectroscopy. These results raise new possibilities in cancer imaging, molecular profiling, and disease staging.

scholarly journals pH and redox dual-sensitive drug delivery system constructed based on fluorescent carbon dots

RSC Advances ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 2656-2663
Author(s):  
Boye Zhang ◽  
Qianqian Duan ◽  
Yi Li ◽  
Jianming Wang ◽  
Wendong Zhang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Cancer Cells ◽  
Fluorescence Imaging ◽  
Drug Delivery System ◽  
Delivery System ◽  
Carbon Dots ◽  
Ph Responsive ◽  
Charge Reversal ◽  
Fluorescent Carbon Dots

The system is pH-responsive and redox-controlled release. And the charge reversal and size transitions of the system can enhance the targeted ability. Moreover, the system can recognize the cancer cells by the fluorescence imaging.

Lanthanide-doped upconversion nanoparticles complexed with nano-oxide graphene used for upconversion fluorescence imaging and photothermal therapy

2018 ◽  
Vol 6 (4) ◽  
pp. 877-884 ◽  
Author(s):  
Po Li ◽  
Yue Yan ◽  
Binlong Chen ◽  
Pan Zhang ◽  
Siling Wang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Fluorescence Imaging ◽  
Photothermal Therapy ◽  
Biomedical Applications ◽  
Drug Delivery Systems ◽  
Delivery Systems ◽  
Research Interest ◽  
Upconversion Nanoparticles ◽  
Multifunctional Nanoparticles ◽  
Nano Oxide

In recent years, multifunctional nanoparticles have attracted much research interest in various biomedical applications such as biosensors, diagnosis, and drug delivery systems.

scholarly journals A Comparative Study on Application of Computer Vision and Fluorescence Imaging Spectroscopy for Detection of Huanglongbing Citrus Disease in the USA and Brazil

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Caio B. Wetterich ◽  
Ratnesh Kumar ◽  
Sindhuja Sankaran ◽  
José Belasque Junior ◽  
Reza Ehsani ◽  
...  
Keyword(s):  
Computer Vision ◽  
Fluorescence Imaging ◽  
Imaging Spectroscopy ◽  
Texture Features ◽  
Support Vector ◽  
Infected Leaf ◽  
Segmented Images ◽  
The Usa ◽  
Citrus Disease

The overall objective of this work was to develop and evaluate computer vision and machine learning technique for classification of Huanglongbing-(HLB)-infected and healthy leaves using fluorescence imaging spectroscopy. The fluorescence images were segmented using normalized graph cut, and texture features were extracted from the segmented images using cooccurrence matrix. The extracted features were used as an input into the classifier, support vector machine (SVM). The classification results were evaluated based on classification accuracies and number of false positives and false negatives. The results indicated that the SVM could classify HLB-infected leaf fluorescence intensities with up to 90% classification accuracy. Though the fluorescence intensities from leaves collected in Brazil and the USA were different, the method shows potential for detecting HLB.

scholarly journals Cell Adherence and Drug Delivery from Particle Based Mesoporous Silica Films

2019 ◽  
Author(s):  
Emma Björk ◽  
Bernhard Baumann ◽  
Florian Hausladen ◽  
Rainer Wittig ◽  
mika lindén
Keyword(s):  
Drug Delivery ◽  
Laser Scanning ◽  
Single Cells ◽  
Silicon Wafers ◽  
Laser Scanning Microscopy ◽  
Drug Uptake ◽  
C2c12 Cells ◽  
Confocal Laser ◽  
Particle Sizes

Spatially and temporally controlled drug delivery is important for implant and tissue engineering applications, as the efficacy and bioavailability of the drug can be enhanced, and can also allow for drugging stem cells at different stages of development. Long-term drug delivery over weeks to months is however difficult to achieve, and coating of 3D surfaces or creating patterned surfaces is a challenge using coating techniques like spin- and dip-coating. In this study, mesoporous films consisting of SBA-15 particles grown onto silicon wafers using wet processing were evaluated as a scaffold for drug delivery. Films with various particle sizes (100 – 900 nm) and hence thicknesses were grown onto OTS-functionalized silicon wafers using a direct growth method. Precise patterning of the areas for film growth could be obtained by local removal of the OTS functionalization through laser ablation. The films were incubated with the model drug DiO, and murine myoblast cells (C2C12 cells) were seeded onto films with different particle sizes. Confocal laser scanning microscopy (CLSM) was used to study the cell growth, and a vinculin-mediated adherence of C2C12 cells on all films was verified. The successful loading of DiO into the films was confirmed by UV-vis and CLSM. It was observed that the drugs did not desorb from the particles during 24 hours in cell culture. During adherent growth on the films for 4 h, small amounts of DiO and separate particles were observed inside single cells. After 24 h, a larger number of particles and a strong DiO signal were recorded in the cells, indicating a particle mediated drug uptake. A substantial amount of DiO loaded particles were however attached on the substrate after 24 making the films attractive as a long-term reservoir for drugs on e.g. medical implants.<br>

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