Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection

Greif D, Galla L, Ros A, Anselmetti D (2008)
Journal of Chromatography A 1206(1): 83-88.

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Abstract
In order to investigate the individual and inhomogenous Cellular response, e.g. to external Stimuli, single cell analysis is mandatory and may provide new cognitions in proteomics as well as in other fields of systems biology in the future. Here, we report on novel chip architectures for single cell analysis based on full body quartz glass microfluidic chips (QG chips) that extend our previous studies in polydimethylsiloxane (PDMS) chips, and enhance the detection sensitivity of native UV laser-induced fluorescence (UV-LIF) detection. Detection of a 10 nM tryptophan Solution With ail S/N ratio of 11.9. which gives a theoretical limit of detection of 2.5 nM (with S/N=3). was possible. With these optimizations the three proteins alpha-chymotrypsinogen A, ovalbumin and catalase each at a concentration of 100 mu g/mL (equal to 4 mu M, 0.4 mu M and 2.2 mu M) were injected electrokinetically and could be separated with nearly baseline resolution. Furthermore, fluorescence spectra (excitation wavelength, lambda(ex) = 266 nm) clearly demonstrate the favourable properties like the very high UV transparency and the nearly vanishing background fluorescence of the QG chips as compared to PDMS chips and to PDMS quartz window (PQW) chips. Finally we exploit the improved sensitivity for single cell electropherograms of Spodoptera frugiperda (Sf9) insect cells. (C) 2008 Elsevier B.V. All rights reserved.
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Greif D, Galla L, Ros A, Anselmetti D. Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection. Journal of Chromatography A. 2008;1206(1):83-88.
Greif, D., Galla, L., Ros, A., & Anselmetti, D. (2008). Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection. Journal of Chromatography A, 1206(1), 83-88.
Greif, D., Galla, L., Ros, A., and Anselmetti, D. (2008). Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection. Journal of Chromatography A 1206, 83-88.
Greif, D., et al., 2008. Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection. Journal of Chromatography A, 1206(1), p 83-88.
D. Greif, et al., “Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection”, Journal of Chromatography A, vol. 1206, 2008, pp. 83-88.
Greif, D., Galla, L., Ros, A., Anselmetti, D.: Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection. Journal of Chromatography A. 1206, 83-88 (2008).
Greif, Dominik, Galla, Lukas, Ros, Alexandra, and Anselmetti, Dario. “Single Cell Analysis in Full Body Quartz Glass Chips with Native UV-Laser Induced Fluorescence Detection”. Journal of Chromatography A 1206.1 (2008): 83-88.
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