Journal
BIOTECHNOLOGY AND BIOENGINEERING
Volume 101, Issue 3, Pages 602-608Publisher
WILEY
DOI: 10.1002/bit.21913
Keywords
biofilm; PFG NMR; propagator; simulation; mass transfer
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Funding
- EPSRC [EP/E012205/1, GR/S43719/01, GR/S20789/01]
- EPSRC [EP/E012205/1, EP/C548817/1] Funding Source: UKRI
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We demonstrate a novel application of C-13 pulsed field gradient (PFG) NMR to monitor mass transfer, due to both flow and diffusion, in a 3D complex porous support structure modified by biofilm growth. This enables timescales an order of magnitude larger than previously possible to be accessed with respect to displacement probability distribution (propagator) measurements. The evolution in the propagator shape with observation time to the Gaussian asymptote (constant dispersion coefficient) is consequently well resolved. We also simulated the measured displacement propagators with good agreement between experiment and prediction. The methodology has significant potential for the selective characterization of the transport of nutrients, metabolic products, pollutants and biocides in such complex biofilm-containing structures.
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