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The study of metabolites from fermentation culture of Alternaria oxytropis

文献类型： 外文期刊

作者： Song, Runjie 1 ; Wang, Jinglong 2 ; Sun, Lu 1 ; Zhang, Yajing 1 ; Ren, Zhenghui 1 ; Zhao, Baoyu 1 ; Lu, Hao 1 ;

作者机构： 1.Northwest A&F Univ, Coll Vet Med, Yangling 712100, Shaanxi, Peoples R China

2.Tibet Acad Agr & Anim Husb Sci, Inst Pratacultural Sci, Lhasa 850000, Tibet, Peoples R China

关键词： Alternaria oxytropis; Metabolites; Alkaloid; Endophytic fungus; Locoweeds

期刊名称：BMC MICROBIOLOGY （ 影响因子：3.605； 五年影响因子：4.283 ）

ISSN： 1471-2180

年卷期： 2019 年 19 卷

页码：

收录情况： SCI

摘要： BackgroundThe indolizidine alkaloid-swainsonine is produced by an endophytic fungus Alternaria oxytropis, which was isolated from locoweeds. Swainsonine has many biological activities such as anti-tumorigenic, anti-viral and bacteriostatic. However, the full complement of metabolites produced by Alternaria oxytropis is not known. This study is a chemical analysis of Alternaria oxytropis metabolites, which not only unravels the potential compounds from the fermentation broth but also in which solvent are they extracted, facilitating industrial application.ResultsAlternaria oxytropis isolated from Oxytropis gansuensis was cultured in Czapek's medium for 30d to collect the fermentation broth. The fermentation broth is treated with methanol and then evaporated to dryness to obtain a concentrate of the fermentation broth. The concentrate is added with water for the subsequent fractional extraction with petroleum ether, chloroform, ethyl acetate and n-butanol. Different fractions of the extract were eluted by wet packing and dry loading. The obtained eluate was combined by TLC to detect the same fraction, and then characterized by GC-MS and LC-MS. The results of GC-MS showed that 105 different compounds existed in the petroleum ether, chloroform, and ethyl acetate phases of Alternaria oxytropis fermentation broth. Moreover, the results of LC-MS indicated that the fermentation broth of Alternaria oxytropis contained five alkaloids, 2-hydroxy-indolizidine, retronecine, lentiginosine, swainsonine and swainsonine N-oxide.ConclusionsIn addition to swainsonine and swainsonine N-oxide, 2-hydroxy-indolizidine, retronecine and lentiginosine were identified as the secondary metabolites of Alternaria oxytropis. Other compounds were also detected including 5,6-dihydroergosterol, eburicol, lanosterol, and L-phenylalanyl-L-proline lactam, which have potential applications as drugs.

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