Biodegradation of High-Molecular-Weight Lignin in Sulfate Reducing Conditions with a Cellulose Cosubstrate

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  • 硫酸塩還元条件におけるセルロースを共存基質とした高分子リグニンの分解特性
  • リュウサンエン カンゲン ジョウケン ニ オケル セルロース オ キョウソンキシツ ト シタ コウブンシ リグニン ノ ブンカイ トクセイ

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Abstract

To investigate the biodegradation of lignin with high molecular weight (HMW) in sulfate reducing conditions, changes in the HMW lignin concentration and chemical structure were analyzed in the presence of a cellulose cosubstrate with a continuously-operated mesophilic reactor. Acid-precipitable polymeric lignin (APPL) and lignin monomers, which are known as degradation byproducts, were isolated and detected. The results showed that HMW lignin was degraded with a maximum degradation capacity of 3.49mg/L/day. APPL was confirmed to be a polymeric degradation byproduct and accumulated along with HMW lignin reduction. We also identified the nonlinear accumulation of aromatic lignin monomers such as hydrocinnamic acid. Through our experimental results, we observed that HMW lignin biodegrades into APPL and aromatic monomers in anaerobic sulfate reducing conditions with a cosubstrate of cellulose.

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