Monitoring of bacteria growth using a wireless, remote query resonant-circuit sensor: Application to environmental sensing

K. G. Ong, J. Wang, R. S. Singh, L. G. Bachas, C. A. Grimes

Research output: Contribution to journalArticle

79 Scopus citations


A new technique is presented for in-vivo remote query measurement of the complex permittivity spectra of a biological culture solution. A sensor comprised of a printed inductor-capacitor resonant-circuit is placed within the culture solution of interest, with the impedance spectrum of the sensor measured using a remotely located loop antenna; the complex permittivity spectra of the culture is calculated from the measured impedance spectrum. The remote query nature of the sensor platform enables, for example, the in-vivo real-time monitoring of bacteria or yeast growth from within sealed opaque containers. The wireless monitoring technique does not require a specific alignment between sensor and antenna. Results are presented for studies conducted on laboratory strains of Bacillus subtilis, Escherichia coli JM109, Pseudomonas putida and Saccharomyces cerevisiae.

Original languageEnglish (US)
Pages (from-to)305-312
Number of pages8
JournalBiosensors and Bioelectronics
Issue number4-5
StatePublished - Jun 21 2001



  • Bacteria
  • Biosensor
  • Complex permittivity
  • Remote query
  • Sensor
  • Yeast

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biomedical Engineering
  • Electrochemistry

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