Cellulose fiber biodegradation in natural waters: river water, brackish water, and seawater
Cellulose fiber biodegradation in natural waters: river water, brackish water, and seawater
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纤维素纤维在自然水域中的生物降解：河水、苦咸水和海水
DOI：
10.1007/s10570-021-04349-w
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发表时间：
2022
期刊：
影响因子：
5.7
通讯作者：
Wada Masahisa
中科院分区：
文献类型：
--
作者：
Nagamine Ryo;Kobayashi Kayoko;Kusumi Ryosuke;Wada Masahisa
纤维素是植物细胞壁的主要成分，在自然界中是可降解的。然而，据我们所知，这是第一份比较不同结构的纤维素纤维在天然水中生物降解性的报告。从日本加墨河和大阪湾收集了河水、咸水和海水。研究了不同结构和结晶度的纤维素纤维、苎麻纤维、丝光苎麻纤维和再生纤维素纤维在收集的天然水中在20℃黑暗条件下降解30天的情况。通过失重试验和生化需氧量（BOD）试验分别评价了初级和好氧最终生物降解性。在失重试验中，发现纤维素纤维在任何天然水中30天内降解率都在50%以上。然而，在BOD试验中，生物降解程度有所降低，在河水、微咸水和海水中的降解程度分别为40%、20-30%和2-10%。这些结果表明，纤维素纤维很容易被降解成细小的碎片，但很难使其最终分解成水和二氧化碳。纤维素纤维在生物降解程度上是否存在这种趋势尚不清楚。测定了纤维素纤维在天然水中降解过程中的分子量。在河水和海水中的降解行为与在微咸水中的降解行为不同。结果表明，降解纤维素纤维的微生物和酶因天然水体的不同而不同，这影响了纤维素纤维生物降解的程度和机理。
Cellulose, the main component of plant cell walls, is degradable in nature. However, to the best of our knowledge, this is the first report that compares the biodegradability of cellulose fibers with different structures in natural waters. River water, brackish water, and seawater were collected from the Kamo River and Osaka Bay, Japan. Biodegradation of cellulose fibers with different structures and crystallinities, ramie, mercerized ramie, and regenerated cellulose fibers in the collected natural water was investigated in the dark at 20 °C for 30 days. The primary and aerobic ultimate biodegradability were evaluated by weight loss and biochemical oxygen demand (BOD) tests, respectively. In the weight-loss test, cellulose fibers were found to be degraded by more than 50% in any natural water within 30 days. However, in the BOD test, biodegradation was diminished, with values of 40%, 20–30%, and 2–10% in river water, brackish water, and seawater, respectively. These results indicate that cellulose fibers are easily degraded into fine fragments, but it is difficult to cause their ultimate decomposition into water and carbon dioxide. Existence of such a tendency in the degree of biodegradation among the cellulose fibers remains unclear. The molecular weight of cellulose fibers in natural water was also measured during their degradation. The degradation behavior in river water and seawater was observed to be different from that in brackish water. The results thus obtained indicate that the microorganisms and enzymes that degrade cellulose fibers differ depending on the natural water, which influences the degree and mechanism of biodegradation.
影响因子：
15
作者：
Nishiyama, Y;Langan, P;Chanzy, H
通讯作者：
Chanzy, H
影响因子：
5.9
作者：
Nakayama, Atsuyoshi;Yamano, Naoko;Kawasaki, Norioki
通讯作者：
Kawasaki, Norioki