Reference: Oberreuter H, et al. (2000) Quantification of micro-organisms in binary mixed populations by Fourier transform infrared (FT-IR) spectroscopy. Lett Appl Microbiol 30(1):85-9

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Abstract


Fourier Transform Infrared (FT-IR) spectroscopy was used for the first time to determine the ratios of different microorganisms in mixtures. Exemplarily, systems composed of two food-associated yeast species (Saccharomyces cerevisiae/Hanseniaspora uvarum) and two yoghurt lactic acid bacteria (Lactobacillus acidophilus/Streptococcus salivarius ssp. thermophilus) were investigated. Determination of the cell number ratio in the lactic acid bacteria system was possible with a minimal prediction accuracy of +/- 16 ratio percentage points while the minimum accuracy of prediction in the yeast two-component system was +/- 4% (both at a 95% confidence level). These results show that FT-IR spectroscopy is potentially a rapid method for the quantification of cell ratios in mixtures of two different microorganisms, provided that the cell ratio does not drop below a certain, system-specific threshold.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Oberreuter H, Mertens F, Seiler H, Scherer S
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