Prussian Blue (bio)sensing device for distance-based measurements.

In this research, microfluidic paper distance-based systems for the quantification of redox species are proposed. For the preparation of the sensing zone a Prussian Blue (PB) (convertible to Prussian White (PW)) layer was deposited in the channel manufactured by wax-printing technique. According to the chemical properties of PB/PW system, it is possible to develop optical sensors sensitive to both oxidizing and reducing agents.

Analytical aspects of smart (phone) fluorometric measurements.

Facing the problem of a growing number of analyses, the need for using simple equipment appears. Smartphone-based optical detection is one of the most widely applied ideas nowadays. A personal device such as a smartphone equipped with a camera is affordable even in the source-limited places.

Compact detectors made of paired LEDs for photometric and fluorometric measurements on paper.

The utility of strikingly simple and cheap optoelectronic detectors operating according to a Paired-Emitter-Detector-Diode (PEDD) principle for microfluidic paper-based analytical devices (μPAD) has been experimentally confirmed. The prototypes of these compact detectors have been made of only two customary light emitting diodes without any additional optical parts like lens, filters, fibers etc. Moreover, for their operation economic and portable equipment is required (low-power circuit and ordinary voltmeter).