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Issue 23, 2011
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Acoustic quantification of ATP using a quartz crystal microbalance with dissipation

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Abstract

A quartz crystal microbalance with a dissipation monitoring (QCM-D) sensor was developed for highly sensitive and specific detection of adenosine-5′-triphosphate (ATP) by using an aptamer. The binding of ATP molecules on the aptamer films could be calculated as accurate mass changes using multiple frequency and dissipation measurements. The detection is achieved by calculating the mass changes from conformational rearrangements of the sensor surface upon interaction with the target. The sensor was demonstrated to respond to changes in ATP concentrations in real time suitable for continuous monitoring applications. This sensor showed excellent selectivity toward ATP compared with other chemically similar nucleotide GTP. The feasibility of the sensor was demonstrated by analyzing ATP concentrations in cell culture media with serum. The maximum frequency change was about −2 Hz after injection of 500 μM ATP. The affinity constant of the aptamer was determined to be 49 ± 7.59 μM. The proposed sensor can extend the application of the QCM-D system in medical diagnosis, and could be adopted for the detection of other small molecules with the use of specific aptamers.

Graphical abstract: Acoustic quantification of ATP using a quartz crystal microbalance with dissipation

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Publication details

The article was received on 22 Aug 2011, accepted on 22 Sep 2011 and first published on 17 Oct 2011


Article type: Paper
DOI: 10.1039/C1AN15762K
Citation: Analyst, 2011,136, 5046-5050
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    Acoustic quantification of ATP using a quartz crystal microbalance with dissipation

    V. C. Özalp, Analyst, 2011, 136, 5046
    DOI: 10.1039/C1AN15762K

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