Cartridge, kit and method for processing biological samples and manipulating liquids having biological samples
Cartridge has a container with at least one well having a channel from a well opening to a container base side, protrusions on the container base side, and a flat polymer film with a hydrophobic upper surface kept at a distance from the base side by the protrusions. The container and film are reversibly attachable to a liquid droplet manipulation instrument so the lower surface of the film abuts at least one electrode array of the instrument. The container enables displacement of a liquid droplet from a well through the channel onto the hydrophobic upper surface and above the electrode array. The instrument has a control unit with a voltage control and an electrode selector for individually selecting each electrode of the electrode array and for providing the selected electrode with a voltage to controlling guided movement of a liquid droplet by electrowetting. A kit and method are also disclosed.
1. A cartridge ( 40 ) for enabling droplet manipulation by electrowetting and processing of biological samples in a liquid droplet manipulation instrument ( 20 ), wherein the cartridge ( 40 ) comprises:
a container ( 2 ) having a top side ( 3 ) and a base side ( 4 ) and comprising at least one well ( 6 ) open at the top side ( 3 ), wherein the at least one well ( 6 ) comprises a bottom side ( 8 ) having at least one opening ( 11 ), the container ( 2 ) further comprising a channel ( 12 ) connecting the opening of the well ( 11 ) with an orifice ( 13 ) on the base side ( 4 ) of the container ( 2 ), and wherein the base side ( 4 ) of the container ( 2 ) comprises protrusions ( 5 ) distributed thereon; and
a flat polymer film ( 14 ) having a lower surface ( 15 ) and a hydrophobic up-per surface ( 16 ), which is kept at a distance (d) to the base side ( 4 ) of the container ( 2 ) by the protrusions ( 5 ), the distance (d) defining at least one gap ( 17 ) when the container ( 2 ) is positioned on the flat polymer film ( 14 ), abutting the latter with its protrusions ( 5 );
wherein the container ( 2 ) and the flat polymer film ( 14 ) are configured to be reversibly attachable to the liquid droplet manipulation instrument ( 20 ) in a way that the lower surface ( 15 ) of the flat polymer film ( 14 ) abuts at least one electrode array ( 21 ) of the liquid droplet manipulation instrument ( 20 ); and
wherein the container ( 2 ) is configured to enable displacement of at least one liquid droplet ( 19 ) from the at least one well ( 6 ) through the channel ( 12 ) of the container ( 2 ) onto the hydrophobic upper surface ( 16 ) of the flat polymer film ( 14 ) and above the at least one electrode array ( 21 ); the liquid drop-let manipulation instrument ( 20 ) comprising a control unit ( 23 ) with at least one electrode selector ( 34 ) connected with at least one voltage control ( 29 ), the at least one electrode selector ( 34 ) being accomplished to individually se-lect each electrode ( 35 ) of the at least one electrode array ( 21 ) and provide the selected electrode ( 35 ) with a voltage controlled by a voltage control ( 29 ) and thus being accomplished to control a guided movement of said liquid droplet ( 19 ) on the hydrophobic upper surface ( 16 ) of the flat polymer film ( 14 ) by electrowetting.
2. The cartridge ( 40 ) of claim 1 , wherein the container ( 2 ) comprises at least one positioning element ( 25 ) for form-fitted attachment of the container ( 2 ) to a positioning element ( 25 ) of the liquid droplet manipulation instrument ( 20 ).
3. The cartridge ( 40 ) of claim 1 , wherein the at least one well ( 6 ) for positioning a biological sample ( 9 ) is sized to accommodate a solid substrate ( 24 ) carrying the biological sample ( 9 ).
4. The cartridge ( 40 ) of claim 3 , wherein the at least one well ( 6 ) of the container ( 2 ) comprises retention means ( 31 ) for preventing the solid substrate ( 24 ) to block the opening ( 11 ) of said well ( 6 ), the retention means ( 31 ) being selected from a group comprising a filter, a frit and relief structures on the well's ( 6 ) bottom side ( 8 ).
5. The cartridge ( 40 ) of claim 1 , wherein the cartridge ( 40 ) comprises at least one well ( 6 ′) that is accomplished as storage for a reaction reagent ( 10 ), the stored reaction reagent ( 10 ) comprising reagents selected from a group com-prising reagents for performing cell lysis, reagents for performing nucleic acid purification, reagents for performing nucleic acid amplification and reagents for performing sequencing of nucleic acids.
6. The cartridge ( 40 ) of claim 1 , wherein the protrusions ( 5 ) of the container ( 2 ) have a height that defines a gap ( 17 ) between the hydrophobic upper sur-face ( 16 ) of the film ( 14 ) and the base side ( 4 ) of the container ( 2 ) of less than 2 mm or less than 1 mm when the container ( 2 ) is positioned on the flat polymer film ( 14 ).
7. The cartridge ( 40 ) of claim 1 , wherein the container ( 2 ) is made by injection molding of an electrically insulating material ( 26 ) and/or an electrically conductive material ( 27 ).
8. The cartridge ( 40 ) of claim 1 , wherein the container ( 2 ) comprises means for identification ( 30 ).
9. The cartridge ( 40 ) according to claim 1 , wherein the flat polymer film ( 14 ) is made as an electrically insulating flat polymer film.
10. The cartridge ( 40 ) according to claim 1 , wherein the container ( 2 ) and the flat polymer film ( 14 ) are made as separate components that remain to be assembled in a first step.
11. The cartridge ( 40 ) of claim 1 , wherein the container ( 2 ) and the flat polymer film ( 14 ) are stably attached to one another.
12. A kit for enabling droplet manipulation by electrowetting and processing of biological samples in a liquid droplet manipulation instrument ( 20 ), the kit including a cartridge ( 40 ) according to claim 1 and comprising a container ( 2 ) and a flat polymer film ( 14 ).
13. The kit of claim 12 , wherein the container ( 2 ) and the flat polymer film ( 14 ) are made as separate components that remain to be assembled in a first step.
14. The kit of claim 12 , wherein the container ( 2 ) and the flat polymer film ( 14 ) are stably attached to one another.
15. The kit of claim 12 , wherein the flat polymer film ( 14 ) is made as an electrically insulating flat polymer film.
16. A method for processing a biological sample ( 9 ) with a liquid droplet manipulation instrument ( 20 ), wherein the method comprises the steps of:
a) providing a liquid droplet manipulation instrument ( 20 ) comprising:
at least one electrode array ( 21 ) for inducing liquid droplet movements; and
a control unit ( 23 ) comprising at least one electrode selector ( 34 ) connected with at least one voltage control ( 29 ), the at least one electrode selector ( 34 ) being accomplished to individually select each electrode ( 35 ) of the at least one electrode array ( 21 ) and provide the selected electrode ( 35 ) with a voltage controlled by a voltage control ( 29 );
b) providing a container ( 2 ) for large volume processing having a top side ( 3 ) and a base side ( 4 ) and comprising at least one well ( 6 ) open at the top side ( 3 ) for positioning a biological sample ( 9 ) and/or a reaction reagent ( 10 ) therein, wherein the at least one well ( 6 ) comprises a bottom side ( 8 ) having at least one opening ( 11 ), the container ( 2 ) further comprising a channel ( 12 ) connecting the opening of the well ( 11 ) with an orifice ( 13 ) on the base side ( 4 ) of the container ( 2 ), and wherein the base side ( 4 ) of the container ( 2 ) comprises protrusions ( 5 ) distributed thereon; and
c) providing a flat polymer film ( 14 ) having a lower surface ( 15 ) and a hydrophobic upper surface ( 16 ), which is kept at a distance (d) to the base side ( 4 ) of the container ( 2 ) by the protrusions ( 5 ), the distance (d) defining at least one gap ( 17 ) when the container ( 2 ) is positioned on the film ( 14 ), abutting the latter with its protrusions ( 5 );
d) reversibly attaching the container ( 2 ) and the film ( 4 ) to the liquid droplet manipulation instrument ( 20 ), so that the lower surface ( 15 ) of the flat polymer film ( 14 ) is abutting the at least one electrode array ( 21 );
e) displacing at least one liquid droplet ( 19 ) from the at least one well ( 6 ) through the channel ( 13 ) of the container ( 2 ) onto the hydrophobic upper surface ( 16 ) of the flat polymer film ( 14 ) and above the at least one electrode array ( 21 ); and
f) processing the liquid droplet ( 19 ) by a guided movement on the hydrophobic upper surface ( 16 ) of the flat polymer film ( 14 ) by electrowetting controlled by the liquid droplet manipulation instrument ( 20 ).
17. The method of claim 16 , wherein the flat polymer film ( 14 ) and the container ( 2 ) are provided as separate components that remain to be assembled in a first step.
18. The method of claim 16 , wherein the flat polymer film ( 14 ) and the container ( 2 ) are provided as a cartridge ( 40 ) of which the flat polymer film ( 14 ) and the container ( 2 ) are stably attached to one another.
19. The method of claim 16 , wherein the at least one liquid droplet ( 19 ) is moved in the gap ( 17 ) within a system liquid that is immiscible with the liquid droplet ( 19 ).
20. The method of claim 18 , wherein the cartridge ( 40 ) with the flat polymer film ( 14 ) and container ( 2 ) stably attached to one another is removed from the liquid droplet manipulation instrument ( 20 ) and disposed.