Bioactive secondary metabolites from the endophytic fungus Chaetomium sp. isolated from Salvia officinalis growing in Morocco

This study reports the chemical investigation and cytotoxic activity of the secondary metabolites produced by the endophytic fungus Chaetomium sp. isolated from Salvia officinalis growing in Morocco. This plant was collected from the Beni-Mellal Mountain in Morocco and belongs to the Lamiaceae family and is named in Morocco 'Salmia'. The endophytic fungus Chaetomium sp. was isolated from the tissues of the stem of this plant. The fungal strain was identified by PCR. The crude organic extract of the fungal strain was proven to be active when tested for cytotoxicity against L5178Y mouse lymphoma cells. Chemical investigation of the secondary metabolites showed that cochliodinol is the main component beside isocochliodinol. The structures of the isolated compounds were determined on the basis of NMR analysis (1H, 13C, COSY and HMBC) as well as by mass spectrometry using ESI (Electron Spray Ionisation) as source

Marine bacterial inhibitors from the sponge-derived fungus Aspergillus sp

Chromatographic separation of a crude extract obtained from the fungus Aspergillus sp., isolated from the Mediterranean sponge Tethya aurantium, yielded a new tryptophan derived alkaloid, 34(1-hydroxy-3-(2methylbut-3-en-2-y1)-2-oxoindolin-3-yl)methyl)-1-methyl-3,4-dihydrobenzo[e][1,41diazepine-2, 5-dione (1), and a new meroterpenoid, austalide R (2), together with three known compounds (3-5). The structures of the new compounds were unambiguously elucidated on the basis of extensive one and twodimensional NMR (1H, 13C, COSY, HMBC, and ROESY) and mass spectral analysis. Interestingly, the compounds exhibited antibacterial activity when tested against a panel of marine bacteria, with 1 selectively inhibiting Vibrio species and 2 showing a broad spectrum of activity. In contrast, no significant activity was observed against terrestrial bacterial strains and the murine cancer cell line L5178Y. (C) 2014 Elsevier Ltd. All rights reserved.Chemistry, OrganicSCI(E)[email protected]

Isolation and structure identification of new alkaloids from the sponge Rhabdastrella rowi

Chemical investigation on marine sponge Rhabdastrella rowi collected from Bali, Indonesia has been performed. This study was aimed to isolate and to identify structures of the sponge secondary metabolites as well as to test their cytotoxicity activity on mouse lymphoma cell line L5178Y.Isolation procedure was performed by using different chromatography techniques. NMR spectroscopy and mass spectrometry methods were used to identify the compounds chemical structures. Cytotoxicity of the isolates was tested on mouse lymphoma cell line L5178Y by using the microculture tetrazolium (MTT) assay.This study yielded two new alkaloids, quinolin-4-ol (1) and quninazolin-4-amine (2) which were found as minor constituents of Rhabdastrella rowi. Both compounds were observed as inactive against mouse lymphoma cell line L5178Y.Key words: Rhabdastrella rowi, sponge, alkaloid

Initial screening of mangrove endophytic fungi for antimicrobial compounds and heavy metal biosorption potential

Endophytic fungi provide protection to their host plant and the fungi often produce antimicrobial compounds to aid the host fighting off pathogens. These bioactive compounds were secondary metabolites which were often produced as waste- or by-products. In the present study, endophytic fungi isolated from mangrove plants and soils were characterized and their antimicrobial production and bioremediation potential of heavy metals copper (Cu) and zinc (Zn) were assessed. Twelve (12) isolated and identified endophytic fungi belonged to seven species; Penicillium, Curvularia, Diaporthe, Aspergillus, Guignardia, Neusartorya and Eupenicillium. Antimicrobial activities of these 12 fungal endophytes were tested against Gram negative bacteria; Bacillus subtilis, Staphylococcus aureus, Gram positive bacteria; Escherichia coli and fungi; Candida albicans and Aspergillus niger among others. Two isolates (related to Guignardia sp. and Neusartoya sp.) showed strong antimicrobial (and antifungal) activity whereas the rest showed no activity. Compounds were isolated from both isolates and screened using HPLC. Both isolates displayed chemically very interesting chromatograms as they possessed a high diversity of basic chemical structures and peaks over a wide range of polarities, with structures similar to Trimeric catechin and Helenalin among others. For bioremediation assessment, the results showed maximum biosorption capacity for two isolates related to Curvularia sp. and Neusartorya sp., with the former removing 25 mg Cu/g biomass and the latter removing 24 mg Zn/g biomass. Our results indicated the potential of mangrove endophytic fungi in producing bioactive compounds and also highlighted their potential for the treatment of heavy metal-contaminated wastewater

(3R,4S)-3,4,8-Trihy­droxy-1,2,3,4-tetra­hydro­naphthalen-1-one monohydrate from Embellisia eureka

In the title hydrate, C10H10O4·H2O, the six-membered aliphatic ring that is fused to the benzene ring has a sofa shape, with the hy­droxy group in the 3-position (that represents the sofa back) of the aliphatic ring occupying a quasi-axial position. The hy­droxy group of the aromatic ring is hydrogen-bond donor to the carbonyl O atom; other O—H⋯O hydrogen bonds link the organic mol­ecules and the water mol­ecules into a three-dimensional network

Volatile metabolites profiling of a Chinese mangrove endophytic Pestalotiopsis sp. strain

Pestalotiopsis JCM2A4, an endophytic fungus originally isolated from leaves of the Chinese mangrove plant Rhizophora mucronata, produces a mixture of volatile metabolites. As determined by gas chromatography and gas chromatography/mass spectrometry (GC/GC-MS), 18 compounds representing all of the hexane extract were identified. Higher amounts of oil-based straight-chained alkyl (mono- and di-methyl) esters and fatty acids were found to compose major volatile chemotype which accounted for 78.65 and 14.52% of this organism, respectively. The main components was demonstrated to be pentadecanoic acid, 14-methyl-, methyl ester (35.92%); octadecanoic acid, methyl ester (13.10%); nonanedioic acid, dimethyl ester (11.21%); and n-hexadecanoic acid (10.54%). Two of these components were isolated and determined to be n-hexadecanoic acid and elaidic acid by 1H NMR and 1H-1H COSY spectroscopy. Antioxidant activity of the hexane extract and isolated compounds were screened using 2,2'-diphenyl-b-picrylhydrazyl (DPPH) free radical scavenging method. This is the first report to describe the volatile metabolites of mangrove endophytic Pestalotiopsis sp. strain; its specific fatty acid methyl esters (FAME) profile can be used as a tool for microbial source tracking.Keywords: Mangrove endophytic fungus, Pestalotiopsis sp., volatile metabolites, fatty acid methyl esters (FAME) profileAfrican Journal of Biotechnology Vol. 12(24), pp. 3802-380

Sagitol C, a new cytotoxic pyridoacridine alkaloid from the sponge Oceanapia sp.

AbstractA new pyridoacridine alkaloid named sagitol C (2) together with two known compounds; kuanoniamine C (1) and sagitol (3) were isolated from the EtOAc fraction of the Indonesian sponge Oceanapia sp. Their chemical structures were established on the basis of physical and spectroscopic methods 1D and 2D NMR, in addition to mass spectrometry and comparison with literature data. Sagitol C was found to exhibit cytotoxic activity when tested against different cancer cell lines