جستجوی مقالات مرتبط با کلیدواژه « marine sponge » در نشریات گروه « شیلات »

Screening of marine bacteria for developing new drugs is an emerging field in marine biotechnology. The purpose of this study was to investigate the diversity of sponge-associated bacteria from Kish and Larak islands (Persian Gulf) and to determine their antimicrobial, antioxidant, and cytotoxic activities. After sampling, bacteria were grown on the marine sponge agar medium. The isolated bacteria were characterized by polyphasic methods. The antimicrobial activity of the isolated bacteria was determined by the microdilution broth method. Cytotoxic activity was evaluated by MTT (3-4,5-dimethylthiazol-2yl-2,5-diphenyltetrazolium bromide) assay on human cell lines. Antioxidant activity was performed by inhibiting DPPH free radicals. Among 121 bacterial isolates, Vibrio and Bacillus genera were the dominant frequency. The minimum inhibitory concentration of the extracted metabolites was recorded in the range of 64 to 512 µg/mL. The IC50 of antioxidant activity varied from 73.42 to 670.90 µg/mL. The cytotoxic activity of the extracted metabolites ranged from 40.57 to 181.80 µg/mL against SW 480 cell line and 141.30 to 359.70 µg/mL against HepG2 cell line. The HL 15, HL 85, and HK 5 extracts showed less toxicity against human umbilical vein endothelial cells. The results of genetic identification based on the comparison of 16S rRNA gene sequence showed that the potent strains HL 15, HL 24, HL 85, HK 5, and HK 36 belonged to B. safensis, V. alginolyticus, V. rotiferianus, B. aureus and Pseudomonas paralactis, respectively. The present study provided a new understanding of the diversity pattern and biological activity of the bacteria associated with Haliclona oculata.

Marines are unique resource that provides a diverse array of natural products, primarily from invertebrates such as sponge. As infectious diseases evolve and develop resistance to existing pharmaceuticals, these ecosystems provide novel leads against microbial, cancer, and viral diseases. The purpose of this study is to investigate antimicrobial and antifungal activities of derivatives of phthalates extracted from Haliclona (Soestella) caerulea on some pathogenic organisms. Sponge samples from Larak Island were collected by divers at a depth of 10 meters. After that, marine sponge extract collection was done by chloroform-methanol extraction as a solvent and through chromatography column and nuclear magnetic resonance (NMR) spectroscopy on the sponge sample, components of dioctyl phthalate (DOTP) and dibutyl phthalate (DBP) were purified and identified. Anti-microbial and antifungal activity of extracted components were investigated by means of bacterial broth dilution method and microdilution broth method and minimum inhibitor concentration (MIC), minimum bactericide concentration (MBC), and minimum fungal concentration (MFC) were determined. The results indicated that DOTP of H. (Soestella) caerulea was active on Bacillus subtilis, Bacillus cereus bacteria. MBC values of DOTP were determined as 2000 μg/m. DBP of H. (Soestella) caerulea was active on gram positive bacteria. MBC values of DOTP were determined as 1000 μg/m for B. cereus and Staphylococcus aureus and 500 μg/mL for B. subtilis. MFC values of DOTP and DBP were determined as 1000 μg/m and 2000 for Candida albicans. Hence it is assumed that the sponge Haliclona (Soestella) caerulea exhibited high antimicrobial activity.