Role of light in the enzymatic breakdown of plant biomass NatureComms
) could to some extent be due to the lower signal-to-noise ratio in these spectra . Thus, we cannot fully exclude that LPMO action also leads to lignin oxidations similar to those occurring upon treatment with light. Further in-depth studies of treated and untreated lignin are needed to unravel the full impact of light and LPMO action of lignin.
The present findings show that LPMO reactions can be fueled by light-exposed lignin and may have wide implications for how we understand biological processes related to biomass conversion in Nature. Lignin is abundant in plant biomass, which could make many processes involving biomass light sensitive. Interestingly, LPMO action was recently shown to be a major contributor to the infectivity of the potato pathogenand one may wonder if infectivity is affected by light.
Organosolv lignins were obtained from spruce and birch. Debarked knife-milled wood was used as feedstocks for organosolv treatments conducted in a 600 mL stirred high-pressure reactor using 50 wt % aqueous ethanol as solvent and a biomass content in the reactor of 10 wt %. The wood suspensions were kept at 190 °C for 90 min or 120 min, for birch or spruce, respectively. After the treatment, the slurries were separated using a hydraulic press and the liquid phase was vacuum filtered .
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