Fig. 1 Digital microfluidic cartridge and ELISA used for measles and rubella testing. Digital microfluidic cartridge and ELISA used for measles and rubella.

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Presentation transcript:

Fig. 1 Digital microfluidic cartridge and ELISA used for measles and rubella testing. Digital microfluidic cartridge and ELISA used for measles and rubella testing. (A) Isometric-view schematic of the DMF top and bottom plates assembled to form a cartridge. Inset: Cross-section image (not to scale) of a complete device bearing inkjet-printed electrodes (black) coated with dielectric (purple) and hydrophobic (yellow) layers. The flexible printing media (peach) substrate is affixed to a glass slide via double-sided adhesive tape (green). ITO, indium tin oxide. (B) Photograph of silver DMF electrodes printed on a flexible substrate using a commercial inkjet printer. (C) Top-view schematic of the DMF device with 92 driving electrodes and 10 reservoir electrodes. (D) Cartoon schematic of measles and rubella ELISAs. Paramagnetic particles coated with measles or rubella virus antigens are incubated with sample. Anti-measles or anti-rubella IgG (red) binds to the particles. Particles are washed and then incubated with anti-human IgG–horseradish peroxidase conjugate (purple). The particles are washed again and then exposed to a mixture of luminol and H2O2 (yellow-green). Enzymatic turnover of the product generates a chemiluminescent product (yellow). (E) Photographs of two assays performed in parallel (that is, “twoplex”) on a DMF cartridge (dyes are added to enhance droplet visibility; black arrows indicate the direction of droplet movement). (1) Droplets of particle suspension are dispensed; (2) blood samples are dispensed and merged with the particles; (3) particles are immobilized by activating the magnetic lens, and supernatant droplets are removed to an absorbent wick; (4) particles are washed in wash buffer (blue); (5) antibody conjugate (purple) is dispensed and incubated with the particles; (6) after further wash steps, droplets of luminol (yellow) and H2O2 (green) are dispensed, mixed, and (7) split; (8) particles are incubated with luminol and H2O2; and (9) particles are moved to the detection zone. Alphonsus H. C. Ng et al., Sci Transl Med 2018;10:eaar6076 Published by AAAS