Characterization of Reagent Pencils for Deposition of Reagents onto Paper-Based Microfluidic Devices

Characterization of Reagent Pencils for Deposition of Reagents onto Paper-Based Microfluidic Devices

Reagent pencils allow for solvent-free deposition of reagents onto paper-based microfluidic devices. The pencils are portable, easy to use, extend the shelf-life of reagents, and offer a platform for customizing diagnostic devices at the point of care. In this work, reagent pencils were characterize...

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Bibliographic Details
Published in:Micromachines (Basel) Vol. 8; no. 8; p. 242
Main Authors: Liu, Cheyenne H, Noxon, Isabelle C, Cuellar, Leah E, Thraen, Amanda L, Immoos, Chad E, Martinez, Andres W, Costanzo, Philip J
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 05-08-2017
MDPI
Subjects:
Abrasion
Absorption spectroscopy
Colorimetry
Customization
Deposition
Devices
Diagnostic systems
diagnostics
Digital imaging
microfluidic paper-based analytical devices (microPADs)
Molecular weight
pencil
Pencils
Polyethylenes
Portable equipment
Reagents
wear
colorimetry
wear
diagnostics
paper
pencil
microfluidic paper-based analytical devices (microPADs)
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Summary:Reagent pencils allow for solvent-free deposition of reagents onto paper-based microfluidic devices. The pencils are portable, easy to use, extend the shelf-life of reagents, and offer a platform for customizing diagnostic devices at the point of care. In this work, reagent pencils were characterized by measuring the wear resistance of pencil cores made from polyethylene glycols (PEGs) with different molecular weights and incorporating various concentrations of three different reagents using a standard pin abrasion test, as well as by measuring the efficiency of reagent delivery from the pencils to the test zones of paper-based microfluidic devices using absorption spectroscopy and digital image colorimetry. The molecular weight of the PEG, concentration of the reagent, and the molecular weight of the reagent were all found to have an inverse correlation with the wear of the pencil cores, but the amount of reagent delivered to the test zone of a device correlated most strongly with the concentration of the reagent in the pencil core. Up to 49% of the total reagent deposited on a device with a pencil was released into the test zone, compared to 58% for reagents deposited from a solution. The results suggest that reagent pencils can be prepared for a variety of reagents using PEGs with molecular weights in the range of 2000 to 6000 g/mol.
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ISSN:2072-666X
2072-666X
DOI:10.3390/mi8080242