Silica Nanopillar Arrays for Monitoring Diffraction-Based Label-Free Biomolecule Separation

2020 ◽  
Vol 3 (9) ◽  
pp. 8810-8816
Author(s):  
Taiga Ajiri ◽  
Takao Yasui ◽  
Masatoshi Maeki ◽  
Akihiko Ishida ◽  
Hirofumi Tani ◽  
...  
Keyword(s):  
Label Free ◽  
Biomolecule Separation ◽  
Nanopillar Arrays

Silicon Carbide Nanowire Devices for Label-Free Electrical DNA Detection

2015 ◽  
Vol 821-823 ◽  
pp. 855-858 ◽  
Author(s):  
Louis Fradetal ◽  
Edwige Bano ◽  
Laurent Montes ◽  
Giovanni Atolini ◽  
Valérie Stambouli
Keyword(s):  
Silicon Carbide ◽  
Silicon Dioxide ◽  
Sol Gel ◽  
Label Free ◽  
Dna Molecules ◽  
Metal Insulator ◽  
Capacitance Measurements ◽  
Silicon Dioxide Matrix ◽  
Nanopillar Arrays

Silicon Carbide is a promising material to overtake the limitations of Si sensors used forin vivodetection. Here, two different nanodevices are presented. The first one is a SiC NWFET used for electrical detection of DNA molecules. The addition of DNA probe molecules increases the current by 25% and the hybridization with DNA targets increases by 80%. This confirms the efficiency of our sensor to detect DNA. The second one is a Metal Insulator Semicondutor capacitor composed of DNA functionalized SiC nanopillar arrays embedded in a sol-gel silicon dioxide matrix. Capacitance measurements show a singular response between 80 and 100 Hz which is attributed to the presence of DNA molecules.

Label-free detection of DNA hybridization using nanopillar arrays based optical biosensor

2014 ◽  
Vol 194 ◽  
pp. 10-18 ◽  
Author(s):  
Jem-Kun Chen ◽  
Gang-Yan Zhou ◽  
Chi-Jung Chang ◽  
Chih-Chia Cheng
Keyword(s):  
Dna Hybridization ◽  
Optical Biosensor ◽  
Label Free ◽  
Label Free Detection ◽  
Nanopillar Arrays

Label-free, mass-sensitive single-molecule imaging using interferometric scattering microscopy

2020 ◽  
Author(s):  
Nikolas Hundt
Keyword(s):  
Single Molecule ◽  
Cellular Systems ◽  
Single Molecule Imaging ◽  
Label Free ◽  
Measurement Sensitivity ◽  
Mass Distributions ◽  
Quantitative Measurements ◽  
Contrast Mechanism ◽  
Cellular Components ◽  
Scattering Signal

Abstract Single-molecule imaging has mostly been restricted to the use of fluorescence labelling as a contrast mechanism due to its superior ability to visualise molecules of interest on top of an overwhelming background of other molecules. Recently, interferometric scattering (iSCAT) microscopy has demonstrated the detection and imaging of single biomolecules based on light scattering without the need for fluorescent labels. Significant improvements in measurement sensitivity combined with a dependence of scattering signal on object size have led to the development of mass photometry, a technique that measures the mass of individual molecules and thereby determines mass distributions of biomolecule samples in solution. The experimental simplicity of mass photometry makes it a powerful tool to analyse biomolecular equilibria quantitatively with low sample consumption within minutes. When used for label-free imaging of reconstituted or cellular systems, the strict size-dependence of the iSCAT signal enables quantitative measurements of processes at size scales reaching from single-molecule observations during complex assembly up to mesoscopic dynamics of cellular components and extracellular protrusions. In this review, I would like to introduce the principles of this emerging imaging technology and discuss examples that show how mass-sensitive iSCAT can be used as a strong complement to other routine techniques in biochemistry.

A microfluidic device with integrated impedance detection for λ-DNA

2003 ◽  
Vol 773 ◽  
Author(s):  
Myung-Il Park ◽  
Jonging Hong ◽  
Dae Sung Yoon ◽  
Chong-Ook Park ◽  
Geunbae Im
Keyword(s):  
Microfluidic Device ◽  
Electrochemical Impedance ◽  
Direct Detection ◽  
Full Potential ◽  
Label Free ◽  
Buffer Solution ◽  
Detection Systems ◽  
Significant Difference ◽  
Detection Of Biomolecules ◽  
Impedance Magnitude

AbstractThe large optical detection systems that are typically utilized at present may not be able to reach their full potential as portable analysis tools. Accurate, early, and fast diagnosis for many diseases requires the direct detection of biomolecules such as DNA, proteins, and cells. In this research, a glass microchip with integrated microelectrodes has been fabricated, and the performance of electrochemical impedance detection was investigated for the biomolecules. We have used label-free λ-DNA as a sample biomolecule. By changing the distance between microelectrodes, the significant difference between DW and the TE buffer solution is obtained from the impedance-frequency measurements. In addition, the comparison for the impedance magnitude of DW, the TE buffer, and λ-DNA at the same distance was analyzed.

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