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A paper microfluidic cartridge for automated staining of malaria parasites with an optically transparent microscopy window.

Abstract
A paper microfluidic cartridge for the automated staining of malaria parasites (Plasmodium) with acridine orange prior to microscopy is presented. The cartridge enables simultaneous, sub-minute generation of both thin and thick smears of acridine orange stained parasites. Parasites are stained in a cellulose matrix, after which the parasites are ejected via capillary forces into an optically transparent chamber. The unique slanted design of the chamber ensures that a high percentage of the stained blood will be of the required thickness for a thin smear, without resorting to spacers or other methods that can increase production cost or require tight quality controls. A hydrophobic snorkel facilitates the removal of air bubbles during filling. The cartridge contains both a thin smear region, where a single layer of cells is presented unobstructed, for ease of species identification, and a thick smear region, containing multiple cell layers, for enhanced limit of detection.
AuthorsMatthew P Horning, Charles B Delahunt, S Ryan Singh, Spencer H Garing, Kevin P Nichols
JournalLab on a chip (Lab Chip) Vol. 14 Issue 12 Pg. 2040-6 (Jun 21 2014) ISSN: 1473-0189 [Electronic] England
PMID24781199 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Acridine Orange
Topics
  • Acridine Orange (chemistry)
  • Humans
  • Malaria, Falciparum (blood)
  • Paper
  • Plasmodium falciparum (cytology)
  • Staining and Labeling (instrumentation, methods)

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