Zheng Xianyun, Li Yuyu, Xu JingChao, Zhang Quanxi, Zhang Yuexia
Institute of Environmental Science, Shanxi University, Taiyuan 030006, China.
Institute of Environmental Science, Shanxi University, Taiyuan 030006, China.
Bioresour Technol. 2025 Feb;417:131833. doi: 10.1016/j.biortech.2024.131833. Epub 2024 Nov 16.
Dimethyl disulfide (DMDS) is an odor compound characterized by the lowest olfactory threshold and high toxicity. It is indispensable to explore the bacteria with high resistance and degradation efficiency to DMDS. Acinetobacter lwoffii, Pseudomonas mendocina, and Myroides odoratus were isolated from kitchen waste. After 6 days of individual treatment, the removal rates were 34.22 %, 40.95 %, and 41.94 % respectively. The DMDS metabolic pathways based on metagenomic assays were discovered to be incomplete due to the insufficient annotation of some key genes in the current database. Following 3 days of treatment with bacterial consortia at ratios of 5:1 for A. lwoffii C2/ M. odoratus C7 and 1:1:1 for the three strains achieved 100 % DMDS removal. Additionally, the consortia reduced hydrogen sulfide (HS) and dimethyl sulfide (DMS).This discovery broadens the spectrum of bacteria exhibiting high tolerance and efficient degradation of DMDS, with significant implications for DMDS removal and odor treatment.
二甲基二硫醚（DMDS）是一种具有最低嗅觉阈值和高毒性的气味化合物。探索对DMDS具有高抗性和降解效率的细菌是必不可少的。从厨余垃圾中分离出了洛菲不动杆菌、门多萨假单胞菌和恶臭希瓦氏菌。经过6天的单独处理，去除率分别为34.22%、40.95%和41.94%。基于宏基因组分析的DMDS代谢途径由于当前数据库中一些关键基因的注释不足而被发现是不完整的。以5:1的比例将洛菲不动杆菌C2/恶臭希瓦氏菌C7混合以及将三种菌株按1:1:1混合的细菌联合体处理3天后，DMDS去除率达到了100%。此外，联合体还减少了硫化氢（HS）和二甲基硫醚（DMS）。这一发现拓宽了对DMDS具有高耐受性和高效降解能力的细菌谱，对DMDS去除和气味处理具有重要意义。
