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Biosensing based on optimized asymmetric optofluidic nanochannel gratings. MICRO AND NANO ENGINEERING 2020. [DOI: 10.1016/j.mne.2020.100056] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Fischer T, Dietrich PM, Streeck C, Ray S, Nutsch A, Shard A, Beckhoff B, Unger WES, Rurack K. Quantification of Variable Functional-Group Densities of Mixed-Silane Monolayers on Surfaces via a Dual-Mode Fluorescence and XPS Label. Anal Chem 2015; 87:2685-92. [DOI: 10.1021/ac503850f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Tobias Fischer
- Division
1.9 Chemical and Optical Sensing, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
| | - Paul M. Dietrich
- Division
6.8 Surface Analysis and Interfacial Chemistry, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203 Berlin, Germany
| | - Cornelia Streeck
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Santanu Ray
- Surface
and Nanoanalysis Group, Analytical Science Division, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - Andreas Nutsch
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Alex Shard
- Surface
and Nanoanalysis Group, Analytical Science Division, National Physical Laboratory, Hampton Road, Teddington, Middlesex TW11 0LW, United Kingdom
| | - Burkhard Beckhoff
- X-ray
and IR Spectrometry Group, Physikalisch-Technische Bundesanstalt PTB, Abbestrasse
2-12, 10587 Berlin, Germany
| | - Wolfgang E. S. Unger
- Division
6.8 Surface Analysis and Interfacial Chemistry, BAM Federal Institute for Materials Research and Testing, Unter den Eichen 44-46, 12203 Berlin, Germany
| | - Knut Rurack
- Division
1.9 Chemical and Optical Sensing, BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany
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Zhang Y, Qiao L, Ren Y, Wang X, Gao M, Tang Y, Jeff Xi J, Fu TM, Jiang X. Two dimensional barcode-inspired automatic analysis for arrayed microfluidic immunoassays. BIOMICROFLUIDICS 2013; 7:34110. [PMID: 24404030 PMCID: PMC3695989 DOI: 10.1063/1.4811278] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Accepted: 06/03/2013] [Indexed: 05/09/2023]
Abstract
The usability of many high-throughput lab-on-a-chip devices in point-of-care applications is currently limited by the manual data acquisition and analysis process, which are labor intensive and time consuming. Based on our original design in the biochemical reactions, we proposed here a universal approach to perform automatic, fast, and robust analysis for high-throughput array-based microfluidic immunoassays. Inspired by two-dimensional (2D) barcodes, we incorporated asymmetric function patterns into a microfluidic array. These function patterns provide quantitative information on the characteristic dimensions of the microfluidic array, as well as mark its orientation and origin of coordinates. We used a computer program to perform automatic analysis for a high-throughput antigen/antibody interaction experiment in 10 s, which was more than 500 times faster than conventional manual processing. Our method is broadly applicable to many other microchannel-based immunoassays.
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Affiliation(s)
- Yi Zhang
- College of Engineering and School of Physics, Peking University, Beijing 100871, China ; National Center for Nanoscience and Technology, Beijing 100190, China
| | - Lingbo Qiao
- Department of Engineering Physics, Tsinghua University, Beijing 100084, China ; Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
| | - Yunke Ren
- College of Engineering and School of Physics, Peking University, Beijing 100871, China
| | - Xuwei Wang
- State Key Laboratory for Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China
| | - Ming Gao
- Department of Engineering Physics, Tsinghua University, Beijing 100084, China
| | - Yunfang Tang
- National Center for Nanoscience and Technology, Beijing 100190, China
| | - Jianzhong Jeff Xi
- College of Engineering and School of Physics, Peking University, Beijing 100871, China
| | - Tzung-May Fu
- College of Engineering and School of Physics, Peking University, Beijing 100871, China
| | - Xingyu Jiang
- National Center for Nanoscience and Technology, Beijing 100190, China
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Wang Y, Lowe RD, Mejia YX, Feindt H, Steltenkamp S, Burg TP. A fluorescence based method for the quantification of surface functional groups in closed micro- and nanofluidic channels. BIOMICROFLUIDICS 2013; 7:26503. [PMID: 24404019 PMCID: PMC3651257 DOI: 10.1063/1.4802270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Accepted: 04/04/2013] [Indexed: 05/24/2023]
Abstract
Surface analysis is critical for the validation of microfluidic surface modifications for biology, chemistry, and physics applications. However, until now quantitative analytical methods have mostly been focused on open surfaces. Here, we present a new fluorescence imaging method to directly measure the surface coverage of functional groups inside assembled microchannels over a wide dynamic range. A key advance of our work is the elimination of self-quenching to obtain a linear signal even with a high density of functional groups. This method is applied to image the density and monitor the stability of vapor deposited silane layers in bonded silicon/glass micro- and nanochannels.
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Affiliation(s)
- Yu Wang
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Rachel D Lowe
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Yara X Mejia
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Holger Feindt
- Micro Systems Technology (MST), Center of Advanced European Studies and Research (caesar), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
| | - Siegfried Steltenkamp
- Micro Systems Technology (MST), Center of Advanced European Studies and Research (caesar), Ludwig-Erhard-Allee 2, 53175 Bonn, Germany
| | - Thomas P Burg
- Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
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