Development of microscopic time‐domain dual lifetime referencing luminescence detection for pH monitoring in microfluidic free‐flow isoelectric focusing
Development of microscopic time‐domain dual lifetime referencing luminescence detection for pH monitoring in microfluidic free‐flow isoelectric focusing
复制标题
开发用于微流体自由流等电聚焦中 pH 监测的微观时域双寿命参考发光检测
DOI:
10.1002/elsc.201400081
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发表时间:
2015
影响因子:
2.7
通讯作者:
S. Nagl
中科院分区:
文献类型:
--
作者:
E. Poehler;C. Herzog;M. Suendermann;S.A. Pfeiffer;S. Nagl
A lifetime‐based ratiometric microscale pH sensor system and a fluorescence microscopic setup was developed for the in‐line observation of pH in free‐flow isoelectric focusing based on the principle of time‐domain dual lifetime referencing (t‐DLR). The t‐DLR method has been developed for pH monitoring and various other applications in the fields of environmental monitoring and biotechnology. Here, we introduce the integration of pH sensor microstructures for t‐DLR in microfluidic channels and the application of the t‐DLR scheme for pH sensing in miniaturized electrophoretic procedures. The pH sensor was inkjet‐printed on glass in rows with a length of 10 mm, a height of 404 ± 18 nm, and a width of 371 ± 28 μm and integrated into a microfluidic chip generated by a laser cutting and lamination technique. It had a working range from pH 4 to 8 with a pKaof 6.10 ± 0.01 and fast response times under 500 ms. The sensor was used for the in‐line observation of the pH gradient during isoelectric focusing of the proteins β‐lactoglobulin A, conalbumin, and myoglobin and their identification by their pI. The obtained pIs were in good agreement with literature data demonstrating the applicability of the pH sensor in microfluidic continuous separations.
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DOI:
--
发表时间:
2008
期刊:
影响因子:
--
作者:
A. Thete;G. Groß;T. Henkel;J. Koehler
通讯作者:
J. Koehler
影响因子:
8.4
作者:
L. Brigo;T. Carofiglio;C. Fregonese;Filippo Meneguzzi;G. Mistura;M. Natali;U. Tonellato
通讯作者:
L. Brigo;T. Carofiglio;C. Fregonese;Filippo Meneguzzi;G. Mistura;M. Natali;U. Tonellato
影响因子:
7.4
作者:
Kohlheyer, Dietrich;Eijkel, Jan C. T.;Schasfoort, Richard B. M.
通讯作者:
Schasfoort, Richard B. M.
影响因子:
6.2
作者:
Mayr, T;Klimant, I;Werner, T
通讯作者:
Werner, T
影响因子:
4.3
作者:
S. Jezierski;L. Gitlin;S. Nagl;D. Belder
通讯作者:
D. Belder