Systems and methods to detect biofilm streamer growth and their uses

Patent metadata

Field	Value
Publication number	US-9752175-B2
Application number	US-201514589845-A
Country	US
Kind code	B2
Filing date	Jan 5, 2015
Priority date	Jan 6, 2014
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

Methods and systems of measuring biofilms and/or biofilm streamers are presented. The system has at least one channel, a biofilm streamer promotion element, a fluid capable of moving along the channel, wherein the fluid has a flow driven by a controlled pressure; and a measuring element capable of measuring a flow rate of the fluid through the channel. Additionally, methods of screening for compound(s) that promote and/or inhibit biofilm and/or biofilm streamers using this system are also presented. Uses of the system, methods and identified compounds are presented for medical and/or industrial environments.

First claim

What is claimed is:

1. A system for measuring biofilm streamers comprising:
a. at least one channel, wherein the channel comprises an inlet, an outlet, a lumen, and at least one biofilm streamer promotion element, wherein a fluid moves through the lumen in a flow driven by a controlled pressure;
b measuring element capable of measuring a flow rate of the fluid through the channel, wherein the measuring element:
(i) receives the fluid in an effluent collecting element after the fluid moves through the lumen;
(ii) measures the weight of the received fluid as a function of time using an analytical balance; and
(iii) communicates the measured weight to a computer, wherein the computer determines the change in weight of the received fluid as a function of time.

2. The system of claim 1 , wherein the controlled pressure is provided by a pumping element or gravity.

3. The system of claim 2 , wherein the pumping element is a syringe, a weight, or a pump.

4. The system of claim 1 , wherein the biofilm streamer comprises bacterium capable of producing a biofilm streamer.

5. The system of claim 1 , wherein the effluent collecting element is a dish.

6. The system of claim 2 , wherein the pumping element is a reservoir suspended above the height of the effluent collecting element, wherein a height differential between the reservoir and the effluent collecting element determines the controlled pressure applied to the fluid.

7. The system of claim 1 further comprising a substrate.

8. The system of claim 7 , wherein the substrate is a glass coverslip.

9. The system of claim 1 , further comprising a microscope capable of imaging the channel.

10. The system of claim 9 , wherein the microscope is capable of imaging biofilm streamer growth.

11. The system of claim 9 , wherein the microscope is capable of imaging biofilm streamer morphology.

12. The system of claim 9 , wherein the microscope is a confocal laser scanning microscope or an epifluorescence microscope.

13. The system of claim 1 , wherein the biofilm streamer promotion element is selected from: a curved channel, a channel with at least one turn, a channel with at least one corner, an edge projecting into the lumen of the channel, a mound projecting into the lumen of the channel, a channel with roughened surfaces, and one or more objects placed within the channel lumen.

14. The system of claim 1 , wherein the channel has at least 2, 3, 4, 5, 6, 7, 8, 9, 10 or 36 corners.

15. The system of claim 1 , wherein the channel has 1 turn about every 400 um.

16. The system of claim 1 , wherein the flow of the fluid is laminar flow.

17. The system of claim 1 , wherein the flow of the fluid is turbulent flow.

18. The system of claim 1 , wherein the flow is characterized by a Reynolds number of less than 2000.

19. The system of claim 1 , wherein the flow is characterized by a Reynolds number of greater than 2000.

20. The system of claim 1 , wherein the flow rate comprises a shear stress of between 0.01 and 100 Pa.

21. The system of claim 1 , wherein the biofilm streamer promotion element is amorphous particles of fluoropolymer placed within the channel lumen.

22. The system of claim 1 , wherein the biofilm streamer promotion element is a channel comprising welded polypropylene feed spacer mesh.

23. The system of claim 1 , wherein the channel is circular.

24. The system of claim 1 , wherein the system further comprises a three-inlet port capable of being opened and closed.

25. The system of claim 24 , wherein the three-inlet port further comprises multilayer microfluidic gates.

26. The system of claim 1 , wherein the channel is selected from: a stent, a pipe, or a cooling tower.

27. The system of claim 1 , wherein the computer continually samples the weight of the received fluid in the effluent collecting element as a function of time and converts the weight of the received fluid to a flow rate.

28. The system of claim 1 , wherein the computer periodically samples the weight of the received fluid in the effluent collecting element as a function of time and converts the weight of the received fluid to a flow rate.

29. The system of claim 1 , wherein the flow rate comprises a shear stress of between 0.01 and 10 Pa.

30. A method of measuring a biofilm streamer comprising:
a. passing a fluid through the system of claim 1 ;
b. monitoring the flow rate over time; and
c. determining either the time until clogging (T) or the duration of the clogging transition (τ).

31. The method of claim 30 , wherein the method further comprises imaging the growth of the biofilm streamer over time.

32. The method of claim 30 , wherein the method further comprises imaging the morphology of the biofilm streamer over time.

33. The method of claim 30 , wherein the method further comprises:
a. adding a test compound to the fluid; and
b. comparing the time until clogging (T) or the duration of the clogging transition (τ) in the presence and in the absence of said test compound.

34. The method of claim 30 , wherein the method further comprises:
a. adding a test compound to the fluid; and
b. comparing the growth or morphology of the biofilm streamer in the presence and in the absence of said test compound.

Assignees

• Univ Princeton

Inventors

• Bassler Bonnie L
• Stone Howard A
• Drescher Knut
• Shen Yi

Classifications

• C12M41/36

  of biomass, e.g. colony counters or by turbidity measurements (electrooptical investigation of individual particles G01N15/14, flow cytometers G01N15/1404) · CPC title

• C12Q1/02

  involving viable microorganisms · CPC title

• C12Q1/18 Primary

  Testing for antimicrobial activity of a material · CPC title