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Proceedings Paper

Point of care optical device for sepsis diagnosis
Author(s): F. Baldini; L. Bolzoni; A. Giannetti; G. Porro; F. Senesi; C. Trono
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Paper Abstract

The discrimination of viral and bacterial sepsis is an important issue in intensive care patients. For this purpose, the simultaneous measurements of different analytes are necessary. Among the possible candidates, C-reactive protein (CRP) and procalcitonin (PCT) are probably the most important ones. A novel optical platform was designed and realised for the implementation of fluorescence-based immunoassays. The core of the optical platform is a plastic biochip, constituted by 13 microchannels (50 μm high, 600 μm width, 10 mm long) through which the sample flows. The sensing layer, where the immunochemical reaction takes place, is located on the upper part of each microchannel. The chip is interrogated with a novel optoelectronic platform, based on fluorescence anisotropy. A line-shaped beam from a 635-nm laser-diode excites perpendicularly the sensing layer and great many of the emitted remains entrapped inside the chip. The particular shape of the top of the chip allows to guide the emitted fluorescence along the same direction of the microchannel. The fluorescence which comes out on the lateral side from the chip is collected by a single plastic optical fibre and sent to an amplified photodiode. The device was characterised by the implementation of the sandwich assay for CRP and PCT spiked in serum. Limit of quantifications of 4.5 and of 6 μg L-1 in serum solution were achieved for CRP and PCT, respectively.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75037J (5 October 2009); doi: 10.1117/12.835418
Show Author Affiliations
F. Baldini, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
L. Bolzoni, Datamed S.r.L. (Italy)
A. Giannetti, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
G. Porro, Datamed S.r.L. (Italy)
F. Senesi, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)
C. Trono, Istituto di Fisica Applicata Nello Carrara, CNR (Italy)


Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors

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