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Diagnostics 2012, 2(4), 97-106; doi:10.3390/diagnostics2040097
Article

Detection of Dissolved Lactose Employing an Optofluidic Micro-System

1,* , 2
 and 1
Received: 2 October 2012; in revised form: 26 November 2012 / Accepted: 3 December 2012 / Published: 6 December 2012
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Abstract: In this work, a novel optofluidic sensor principle is employed for a non-invasive and label-free characterization of lactose containing liquid samples. Especially for medicine and food industry, a simple, fast and accurate determination of the amount of lactose in various products is highly desirable. The presented system exploits the impact of dissolved molecules on the refractive index for sample characterization. On the optofluidic chip, a microfluidic channel filled with the analyte is hit by slightly diverging laser light. The center incident angle of the beam on-chip is set close to the critical angle for total internal reflection. Both the reflected and the transmitted light signals are recorded at the solid-liquid interface. The ratio of those two signals is then used as representative value for the analyte. Using this principle, lactose containing samples were differentiated based on their concentrations at a step size of 10 mmol/L. The use of the signals ratio instead of a single signal approach improves the stability of the system significantly, allowing for higher resolutions to be achieved. Furthermore, the fabrication of the devices in PDMS ensures biocompatibility and provides low absorbance of light in the visible range.
Keywords: lactose detection; non-invasive; label-free; optofluidics; partial total internal reflection lactose detection; non-invasive; label-free; optofluidics; partial total internal reflection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Weber, E.; Keplinger, F.; Vellekoop, M.J. Detection of Dissolved Lactose Employing an Optofluidic Micro-System. Diagnostics 2012, 2, 97-106.

AMA Style

Weber E, Keplinger F, Vellekoop MJ. Detection of Dissolved Lactose Employing an Optofluidic Micro-System. Diagnostics. 2012; 2(4):97-106.

Chicago/Turabian Style

Weber, Emanuel; Keplinger, Franz; Vellekoop, Michael J. 2012. "Detection of Dissolved Lactose Employing an Optofluidic Micro-System." Diagnostics 2, no. 4: 97-106.

Diagnostics EISSN 2075-4418 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert