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Method of conducting a droplet based enzymatic assay

  • US 8,440,392 B2
  • Filed: 03/23/2008
  • Issued: 05/14/2013
  • Est. Priority Date: 03/22/2007
  • Status: Active Grant
First Claim
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1. A method of conducting a droplet-based enzymatic assay, the method comprising:

  • (a) providing a droplet actuator;

    (b) providing on the droplet actuator;

    (i) a droplet comprising an enzyme of interest;

    (ii) a droplet comprising a substrate which is potentially modified in the presence of the enzyme;

    (c) executing droplet operations on the droplet actuator to combine the droplet of (b)(i) with the droplet of (b)(ii), thereby yielding an assay droplet, wherein the droplet operations are electrowetting mediated;

    (d) detecting modification of the substrate by the enzyme in the assay droplet on the droplet actuator; and

    wherein each of the droplet of (b)(i), the droplet of (b)(ii) and the assay droplet is at least partially surrounded by a silicone oil filler fluid comprising an nonionic low hydrophile-lipophile balanced (HLB) surfactant.

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