IP Library › Granted Patent US 12,233,390
Granted Patent B2
US 12,233,390 · App. 17/427,290 · Granted Feb 25, 2025

Nonfouling compositions and methods for manipulating and processing encapsulated droplets

Inventors: Eduardo Cervantes (San Francisco, CA); Mais Jehan Jebrail (Toronto, CA)
Assignee: mirOculus Inc.
B01J13/04C12N5/0012
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Quick Facts
Patent No.
US 12,233,390
App. No.
17/427,290
Granted
Feb 25, 2025
Kind
B2
Abstract

Compositions for preventing or limiting surface fouling as well as evaporation and methods for their use in air-matrix digital microfluidics (DMF) apparatuses are described. A mobilizing wax material may be used to selectively encapsulate a reaction droplet in the air gap of the apparatus, which permits the at least partially encapsulated reaction droplet to be portable within the DMF apparatus. Additional aqueous droplets may be combined with the encapsulated droplet, by merging with an aqueous droplet having a coating of a secondary material (e.g., an oil or other hydrophobic material) that may allow combining of the droplets. The compositions may be additionally useful in non-DMF applications such as laboratory protocols for hybridization, ligation and amplification.

Claims (21)

1. A method of preventing surface fouling within an air-matrix digital microfluidic (DMF) apparatus, the method comprising:

introducing an aqueous droplet into an air gap of the air-matrix DMF apparatus which is formed between a first plate and a second plate of the air-matrix DMF apparatus; and

encapsulating the aqueous droplet within a sheath of a mobilizing wax composition comprising a liquid wax component and a lipophilic mobilizing component, wherein the liquid wax component comprises a tetradecane or hexadecane and is a liquid at temperatures from 4° C. to 100° C., and the lipophilic mobilizing component comprises a non-ionic surfactant having a hydrophilic-lipophilic balance (HLB) less than 7, wherein the lipophilic mobilizing component comprises Polyethylene glycol oleyl ether, and is mixed with the wax component in a concentration (v/v %) from 0.01% to about 0.1%, wherein the lipophilic mobilizing component forms a layer at a surface of the water-liquid wax interface so that a hydrophilic head group of the lipophilic polymer is oriented towards water and a hydrophobic tail of the lipophilic polymer is oriented toward the liquid wax thereby preventing surface fouling by absorption of proteins within the aqueous droplet.

2. The method of claim 1 , wherein introducing the aqueous droplet into an air gap comprises combining multiple droplets to form the aqueous droplet within the air gap.

3. The method of claim 1 , wherein the mobilizing wax composition is introduced in a mixture with the aqueous drop while introducing the aqueous drop into the air-gap.

4. The method of claim 1 , wherein encapsulating the aqueous droplet with the mobilizing wax further comprises transporting, by electrowetting, the aqueous droplet to a droplet preparation zone of the air gap, wherein the droplet preparation zone comprises the mobilizing wax composition.

5. The method of claim 4 , wherein moving, by electrowetting, the at least partially encapsulated first aqueous droplet comprises transferring the at least partially encapsulated first aqueous droplet away from the droplet preparation zone so that at least some of the mobilizing wax composition is left behind.

6. The method of claim 1 , further comprising merging the encapsulated aqueous droplet with a carrier droplet comprising a second aqueous droplet coated with an oil or an organic solvent in the air gap to form an encapsulated combined aqueous droplet.

7. The method of claim 1 , wherein the first plate comprises a plurality of adjacent actuation electrodes, and wherein combining the aqueous droplet with the mobilizing wax comprises applying energy to a subset of the actuation electrodes of the plurality of adjacent actuation electrodes thereby moving the aqueous droplet into contact with the mobilizing wax composition.

8. The method of claim 1 , wherein the aqueous droplet comprises a reagent, a micro-object or a combination thereof.

9. The method of claim 1 , wherein the aqueous droplet comprises a bead, a biological cell, a subcellular portion of a cell, or any combination thereof.

10. The method of claim 1 , wherein the aqueous droplet does not include a hydrophilic polymer additive.

11. The method of claim 1 , further comprising:

moving the encapsulated aqueous droplet, by electrowetting, to a thermal zone of the air gap; and

regulating the temperature of the encapsulated aqueous droplet to allow a reaction to proceed within the aqueous droplet before transporting the aqueous droplet out of the thermal zone within the air gap.

12. A method of preventing surface fouling within an air-matrix digital microfluidic (DMF) apparatus, the method comprising:

encapsulating an aqueous droplet within a sheath of a mobilizing wax composition comprising a liquid wax component and a lipophilic mobilizing component, wherein the wax component comprises a tetradecane or hexadecane that is a liquid wax at temperatures from 4° C. to 100° C., and the lipophilic mobilizing component comprises a non-ionic surfactant having a hydrophilic-lipophilic balance (HLB) less than 7, wherein the lipophilic mobilizing component comprises Polyethylene glycol oleyl ether, and is mixed with the wax component in a concentration (v/v %) from 0.01% to about 0.1%, wherein the lipophilic mobilizing component forms a layer at a surface of the water-liquid wax interface so that a hydrophilic head group of the lipophilic polymer is oriented towards water and a hydrophobic tail of the lipophilic polymer is oriented toward the liquid wax thereby preventing surface fouling by absorption of proteins within the aqueous droplet; and

introducing the encapsulated aqueous droplet into an air gap of the air-matrix DMF apparatus which is formed between a first plate and a second plate of the air-matrix DMF apparatus.

13. A mobilizing wax composition for preventing surface fouling and evaporation during a digital microfluidics (DMF) operation, the mobilizing wax composition comprising:

a wax component comprising a tetradecane or hexadecane for encapsulating an aqueous droplet, wherein the wax component is a liquid wax at temperatures from 4° C. to 100° C.; and

a lipophilic mobilizing component comprising Polyethylene glycol oleyl ether for preventing surface fouling, comprising a non-ionic surfactant having a hydrophilic-lipophilic balance (HLB) less than 7, wherein the lipophilic mobilizing component is mixed with the wax component in a concentration (v/v %) from 0.01% to about 0.1%.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 29, 2022
From: CERVANTES, EDUARDO; JEBRAIL, MAIS JEHAN
To: MIROCULUS INC.
Reel/Frame 059431/0001 →
Continuity (2)
Provisional Application 62799734 · Jan 31, 2019
Related Publication 20220161216A1 · May 26, 2022
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