期刊
LAB ON A CHIP
卷 11, 期 10, 页码 1770-1775出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1lc20054b
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资金
- NIH [1DP2OD007161-01]
- NIH NIAID [1U01AI082457-01, R43AI088756-01]
- NIH NICHD [R43HD065303-01]
- NSF [0930900, 0900899]
- NSFC [20805027]
- SDNSF [Q2007B04, Y2008B39]
- EUNICE KENNEDY SHRIVER NATIONAL INSTITUTE OF CHILD HEALTH &HUMAN DEVELOPMENT [R43HD065303] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [U01AI082457, R43AI088756, R44AI088756] Funding Source: NIH RePORTER
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [DP2OD007161] Funding Source: NIH RePORTER
This study reports a hybrid electrokinetic technique for label-free manipulation of pathogenic bacteria in biological samples toward medical diagnostic applications. While most electrokinetic techniques only function in low-conductivity buffers, hybrid electrokinetics enables effective operation in high-conductivity samples, such as physiological fluids (similar to 1 S m(-1)). The hybrid electrokinetic technique combines short-range electrophoresis and dielectrophoresis, and long-range AC electrothermal flow to improve its effectiveness. The major technical hurdle of electrode instability for manipulating high conductivity samples is tackled by using a Ti-Au-Ti sandwich electrode and a 3-parallel-electrode configuration is designed for continuous isolation of bacteria. The device operates directly with biological samples including urine and buffy coats. We show that pathogenic bacteria and biowarfare agents can be concentrated for over 3 orders of magnitude using hybrid electrokinetics.
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