Journal article
Method for label-free detection of femtogram quantities of biologics in flowing liquid samples
Analytical chemistry (Washington), v 79(7), pp 2762-2770
01 Apr 2007
PMID: 17309231
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Rapid (approximately 10 min) measurement of very low concentration of pathogens (approximately 10 cells/mL) and protein (approximately fg/mL) has widespread use in medical diagnostics, monitoring biothreat agents, and in a broader context as a research method. For low-level pathogen, we currently use culture enrichment methods and, thus, rapid analysis is not possible. For low protein concentration, no direct method is currently available. We report here a novel macrocantilever design whose high-order resonant mode near 1 MHz exhibits mass detection sensitivity of 10 cells/mL for cells and 100 fg/mL for protein. The sensor is 1x3 mm and uses a piezoelectric layer for both actuation and sensing resonance. Sample is flowed (approximately 1 mL/min) past the antibody-immobilized sensor, and as antigen binds to the sensor, resonance frequency decreases in proportion to antigen concentration. The sensor showed selectivity to the pathogen even though copious nonpathogenic variant was simultaneously present.
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Details
- Title
- Method for label-free detection of femtogram quantities of biologics in flowing liquid samples
- Creators
- David Maraldo - Drexel UniversityKishan Rijal - Drexel UniversityGossett Campbell - Drexel UniversityRaj Mutharasan - Drexel University
- Publication Details
- Analytical chemistry (Washington), v 79(7), pp 2762-2770
- Publisher
- American Chemical Society; Washington, DC
- Grant note
- 5R01EB000720 / NIBIB NIH HHS
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000245304300017
- Scopus ID
- 2-s2.0-34247120167
- Other Identifier
- 991019170854504721
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- Web of Science research areas
- Chemistry, Analytical