Summary
The supernatants of effluents from an artificial rumen reactor degrading barley straw have been shown to contain lignin-derived compounds by UV spectral characteristics and pyrolysis mass spectrometry (PYMS). Most of these compounds were shown to be released by the action of rumen microorganisms. The compounds were quantified by measuring absorbance at 280 nm using bamboo-milled wood lignin as a standard. The concentration of the compounds rose from 0.5 mg·ml−1 at solid and liquid retention times (SRT and HRT) of 60 and 12 h, respectively, and a loading rate (LR) of 25 g total solids (TS)·l−1 per day to 3.5 mg·ml−1 at a SRT of 144 h, an HRT of 20 days and an LR of 15 g TS·1−1 per day. The highest concentration was below the level known to be toxic to rumen microorganisms in vitro. No indications were found for anaerobic lignin degradation in the rumen reactor.
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Kivaisi, A.K., Op den Camp, H.J.M., Lubberding, H.J. et al. Generation of soluble lignin-derived compounds during degradation of barley straw in an artificial rumen reactor. Appl Microbiol Biotechnol 33, 93–98 (1990). https://doi.org/10.1007/BF00170578
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DOI: https://doi.org/10.1007/BF00170578