A New Record of Neohelicosporium guangxiense and Its Secondary Metabolites

Lijuan Zhang, Jian Ma, Xiaoyan Ma, Xin Feng, Xuesong Bai, Yongtao Huang, Ruvishika S. Jayawardena, Ausana Mapook, Jichuan Kang and Yongzhong Lu
* Author for corresponding; e-mail address: yzlu@git.edu.cn
Volume: Vol.50 No.2 (March 2023)
Research Article
DOI: https://doi.org/10.12982/CMJS.2023.010
Received: 21 September 2022, Revised: 28 December 2022, Accepted: 31 December 2022, Published: -

Citation: Zhang L., Ma J., Ma X., Feng X., Bai X., Huang Y., et al., A New Record of Neohelicosporium guangxiense and Its Secondary Metabolites, Chiang Mai Journal of Science, 2023; 50(2): e2023010. DOI 10.12982/CMJS.2023.010.

Abstract

In a diversity study of helicosporous hyphomycetes, a new record viz. Neohelicosporium guangxiense was collected, isolated and identified based on multi-gene phylogenetic analyses and morphological evidence. In this study, secondary metabolites of N. guangxiense were also investigated, from which four compounds were isolated and identified, including three α-tetralon derivatives (1-3) and one isocoumarin derivative (4). This is the first time that these compounds were isolated from the fungal genus Neohelicosporium, and compound 1 was firstly isolated from natural resources. Their structures were assigned based on the extensive 1D/2D NMR spectroscopic analyses, ESI-MS, and HR-ESI-MS measurements, especially the 2D NMR spectra of compound 1 were described in detail, and the absolute configuration of compound 1 was also elucidated for the first time. Furthermore, the bioactivities of all compounds were inactive in our bioassays.

Keywords: Helicosporous hyphomycetes, saprophytic fungi, new record, secondary metabolites

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