Abstract
Biofilms are colonies of microbial cells in a polymeric matrix. Formation of biofilms has been associated with a broad range of industrial problems at the annual cost of billions of dollars. For example, biofilms are ubiquitous in water distribution systems and control of their growth have been a great challenge, with many water utilities in the US reporting biofilm survival in water distribution systems despite the continuing presence of disinfectants. In addition to being a nuisance, biofilms may also harbor various types of microorganisms including opportunistic pathogens and thus can threaten public health. The conventional methods for studying biofilms include microelectrode sensors fabricated from pulled glass micropipettes. However, fragility, difficulty to manufacture and operate, and susceptibility to electrical interference limit their use to specialized laboratories under highly controlled conditions. Thus, there is a critical need for robust microelectrode sensors that can be used In Situ to study biofilms.
This chapter describes the use of microelectromechanical systems (MEMS) technologies to develop needle-type sensors for In Situ measurements in biofilms. The individual needle-type sensors for measuring oxidation reduction potential (ORP), dissolved oxygen (DO), and phosphate were integrated into a single multi-analyte sensor array. All three sensors were extensively characterized, exhibiting higher sensitivity, faster response time, and higher stability with smaller tip size than the conventional sensors. The multi-analyte sensor was successfully applied to In Situ evaluation of microprofiles in multi-species biofilms. The major advantages of these new MEMS sensors include the ability to penetrate samples to perform measurements, the small tip size for In Situ measurements, array structure for higher robustness, and possibility of multi-analyte detection. The sensors demonstrated monitoring of local concentration changes in small structures with a high spatial resolution, and offer the versatility of the microelectrode technique as well as the capability for repetitive measurements. Ultimately, this research will enable in situ measurements in a wide variety of small sample applications in environmental engineering and life sciences.
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Abbreviations
- ASTM::
-
American society for testing and materials
- COM::
-
Commercially available millielectrode
- CCD::
-
Charge couple device
- COD::
-
Chemical oxygen demand
- DO::
-
Dissolved oxygen
- EBPR::
-
Enhanced biological phosphorus removal
- EDM::
-
Electrical discharge machining
- EPS::
-
Extracellular polymeric substances
- FISH::
-
Fluorescent in situ hybridization
- HOC::
-
Hydrophobic organic compound
- HRT::
-
Hydraulic retention time
- IC::
-
Integrated circuit
- ISFETs::
-
Ion-sensitive field-effect transistors
- LOC::
-
Lab-on-a-chip
- ME::
-
Conventional pulled-glass pipette microelectrode
- MEA::
-
Microelectrode Array
- MEMS::
-
Microelectromechanical systems
- MLSS::
-
Mixed liquid suspended solids
- ORP::
-
Oxidation reduction potential
- PAOs::
-
Phosphate accumulating organisms
- PCB::
-
Printed circuit board
- SBR::
-
Sequencing batch reactor
- SRT::
-
Sludge retention time
- UEA::
-
Utah Electrode Array
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Acknowledgements
The authors gratefully acknowledge financial support of this work by grants from the National Science Foundation (BES-0228603, BES-0529217), the National Institute of Environmental Health Sciences (NIEHS), the U.S. Environmental Protection Agency, and the University of Cincinnati Institute for Nanoscale Science and Technology. The authors also thank Frank Sauser for assistance with ORP MEA packaging, Dr. Fred Beyette and Alla Suresh Kumar for assistance with electrical signal conditioning, Dr. Peng Jin for assistance with beveling, and Tae-Sun Lim for assistance with DO MEA sensor fabrication and characterization [79–83].
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Lee, JH., Seo, Y., Lee, W.H., Bishop, P., Papautsky, I. (2010). Needle-Type Multi-Analyte MEMS Sensor Arrays for In Situ Measurements in Biofilms. In: Shah, V. (eds) Emerging Environmental Technologies, Volume II. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-3352-9_6
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