Monitoring bacterial growth using tunable resistive pulse sensing with a pore-based technique
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AbstractA novel bacterial growth monitoring method using a tunable resistive pulse sensor (TRPS) system is introduced in this study for accurate and sensitive measurement of cell size and cell concentration simultaneously. Two model bacterial strains, Bacillus subtilis str.168 (BSU168) and Escherichia coli str.DH5 alpha (DH5 alpha), were chosen for benchmarking the growth-monitoring performance of the system. Results showed that the technique of TRPS is sensitive and accurate relative to widely used methods, with a lower detection limit of cell concentration measurement of 5 x 10(5) cells/ml; at the same time, the mean coefficient of variation from TRPS was within 2 %. The growth of BSU168 and DH5 alpha in liquid cultures was studied by TRPS, optical density (OD), and colony plating. Compared to OD measurement, TRPS-measured concentration correlates better with colony plating (R = 0.85 vs. R = 0.72), which is often regarded as the gold standard of cell concentration determination. General agreement was also observed by comparing TRPS-derived cell volume measurements and those determined from microscopy. We have demonstrated that TRPS is a reliable method for bacterial growth monitoring, where the study of both cell volume and cell concentration are needed to provide further details about the physical aspects of cell dynamics in real time.
All Author(s) ListYu ACS, Loo JFC, Yu S, Kong SK, Chan TF
Journal nameApplied Microbiology and Biotechnology
Volume Number98
Issue Number2
Pages855 - 862
LanguagesEnglish-United Kingdom
KeywordsBacterial growth monitoring; Cell concentration; Cell volume; Tunable resistive pulse sensing
Web of Science Subject CategoriesBiotechnology & Applied Microbiology; BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Last updated on 2020-27-11 at 01:50