open access

https://hdl.handle.net/2115/71678

Sub-Zeptomole Detection in a Microfabricated Glass Channel by Thermal-Lens Microscopy.

英語

integrated chemistry laboratory convection

1999-06

日本分析化学会

Analytical Sciences

15(6)

525-529

A thermal-lens microscope which we developed was applied to an ultramicro quantity determination of a dye in an aque-ous solution filling a microchannel (150 µm wide and 100 µm deep) fabricated in a quartz glass substrate. The detection volume, which corresponded to the confocal volume, was estimated to be 1.3 fl. The detection limit of the dye molecules was 160 ymol, and the calibration line showed good linearity in the sub-zmol-to-zmol region. This detection sensitivity is equivalent to that of laser-induced fluorometry. The thermal-lens signal measured in the microchannel was more stable than that measured in a liquid micro space between a slide glass and a cover glass, which was much wider than the microchannel. This may have been due to a suppression of convection in the microchannel. The thermal lens method can be applied to non-fluorescent chemical species, and is thus very suitable detection method for integrated chemistry sys-tems.

学術雑誌論文

Version of Record

0910-6340

1348-2246

AA10500785