A new compound, (6R,7S,2E,4E)-6,7-dihydroxy-4,6-dimethylocta-2,4-dienoic acid (1), together with eight known compounds were isolated from the co-culture of Saccharicola sp. and Botryosphaeria parva, an endophytic fungi associated with Eugenia jambolana Lam. (Myrtaceae) plant species. The structures were elucidated by spectroscopic analysis of the one-dimensional (1D) and two-dimensional (2D) nuclear magnetic resonance (NMR) and mass spectrometry (MS) data as well as by comparison with literature data. The bioactivity (antioxidant and antifungal) of the crude EtOAc was evaluated. All crude extracts presented antioxidant activity and only the crude extract from the co-culture was active on the fungus Cladosporium sphaerospermum. This investigation contributed to the knowledge about the metabolic production of two endophytic fungi Saccharicola sp. and Botryosphaeria parva in co-culture, once, until the present date, there are no studies in the literature that report the understanding of the chemical interaction of both grown in the same environment.

The upscaling of Xylaria cubensis, an endophyte of Eugenia brasiliensis (Myrtaceae), in PDB medium led to the isolation of known compounds including cytochalasin D (7) and cytochalasin C (8), which exhibited relatively higher phytotoxic activity in all the concentrations tested compared to the commercial herbicide GOAL®. Besides the aforementioned metabolites, one diketopiperazine (DKP) and two isocoumarins were isolated and two DKPs were also identified in the mixture. The structures were determined by 1D and 2D 1H NMR, MS analyses and were compared with the literature.

A new compound named methyl (6S,7S,2E,4E)-6,7-dihydroxy-4,6-dimethyl octanoate was isolated from Saccharicola sp. using high performance liquid chromatography-solid phase extraction-transfer tube (HPLC-SPE-TT), together with four known compounds, fusaric acid, trans-4-hydroxymellein, thymidine and adenosine. Saccharicola sp. was isolated from the stems of Eugenia jambolana Lam. (Myrtaceae) as endophytic fungus. The structure of this novel substance was established based on its spectroscopic data, including 1H and 13C nuclear magnetic resonance (NMR), 2D NMR techniques and high-resolution electrospray ionization mass spectrometry (HR-ESI-MS). This paper deals with the first report of its kind on this compound in Saccharicola sp.