Timor Island is very hot and dry due to the high intensity of sunlight experienced throughout the year. The endophytic fungi Aspergillus flavus had been isolated from medicinal plants such as Catharanthus roseus, Annona squamosa and Curcuma xanthorisa. The endophytic fungi A. flavus from each plant was cultivated on solid rice media and then analyzed for its capability for producing kojic acid. The production of kojic acid was analyzed by HPLC; the highest amount of kojic acid was observed from the endophytic fungi A. flavus, isolated from the stem of Catharanthus roseus, followed by A. flavus from Annona squamosa and Curcuma xanthorisa. Simple VLC fractionation of the extract of A. flavus from C.roseus led to the isolation of around 11.1 g of pure kojic acid. The structure of kojic acid (1) was confirmed by NMR and MS spectroscopic data. A comparison of the NMR data with the literature supported the revision of the natural product flufuran to kojic acid. To the best of our knowledge, this is the first report of a strain of endophytic fungi producing only kojic acid without any other toxic metabolites such as alfatoxins. Therefore, this Aspergillus flavus strain can be applied as a potential producer of kojic acid for industrial use.
Research on isolation, identification, and antimicrobial activity of secondary metabolites of endophytic fungi from leaves of Annona squamosa growing in dryland had been undertaken. The work includes the isolation of endophytic fungi, cultivation, and extraction of fungal extract and identification of chemical metabolites together with the antibacterial test. The pure colony of endophytic fungi was grown on solid rice media using 1 L Erlenmeyer flask. The grown fungi were extracted with ethyl acetate. The ethyl acetate crude extract was then further subjected to chemical analysis and its antibacterial properties. Endophytic fungi species was identified as Aspergillus niger based on macroscopic and microscopic analysis. Analysis LC-MS/MS had revealed the presence of five metabolites including ephedradine A, ergosine, Ia, mudanpioside H, and trichosanic acid. The extract showed strong inhibition against Staphyloccus aureus with diameter of zone inhibition of 16.1 mm and moderate inhibition against Escherichia coli 0175H7 and Salmonella enteritidis ATCC 6939 with the observed diameter of zone inhibition of 9.6 mm and 11.3 mm, respectively.
Abstract. Lay CS, Agustina I, Astuti P, Hertiani T. 2023. Cytotoxic screening of endophytic fungi associated with Catharanthus roseus. Biodiversitas 24: 2716-2722. Despite the advancements in cancer therapy, there is still a need for new anticancer agents. Due to the tremendous range of chemical compounds that endophytic fungi create, they have become a crucial component of the current drug development process. The aim of this study was to evaluate the cytotoxic potential of endophytic fungi associated with Catharanthus roseus (L.) G.Don collected from Yogyakarta, Indonesia. All fungal EtOAc extracts were tested against three human cancer cell lines, HeLa, T47D, MCF-7, and Vero cell lines. The potential fungal isolate was identified using molecular techniques. The results showed that a total of seven endophytic fungi were obtained from the different parts of C. roseus. Only one fungus (SCR 3) showed the best cytotoxic activitiy towards all three cell lines used, especially the MCF-7 cell line (IC50 130.90 ?g/mL, Selectivity Index=11.42). The findings of using LC-HRMS also revealed several exciting compounds such as genistein and D-(-)-Mannitol. The results showed that EtOAc extract of SCR 3 (Aspergillus sp.) induced apoptosis but did not affect the cell cycle. This study suggests that EtOAc extract of SCR 3 may be a potential source of secondary metabolites that can function as a new source of anticancer agents.
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