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Author: Sherif Saeed Ebada Elsayed
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Languages : en
Pages :
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Author: Sherif Saeed Ebada Elsayed
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Languages : en
Pages :
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Author: Triana Hertiani
Publisher: Cuvillier Verlag
ISBN: 3736923279
Category : Medical
Languages : en
Pages : 344
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A total of 35 compounds comprising diverse structural groups of compounds including both alkaloids and terpenes were isolated; fourteen of which are new derivatives. The structures of the new compounds were unambiguously established on the basis of NMR spectroscopic (1H, 13C, COSY, 1H-detected direct and long range 13C-1H correlations) and mass spectrometric (EI, and ESI) data. The identities of the known compounds were established by comparison with published data. Sponge samples originated from several collection sites in Indonesia. A combination of a chemically-and biologically driven approach for drug discovery was employed. Extracts were screened for antibacterial, antifungal, and cytotoxic activities as well as protein kinase inhibition parallel to the usage of TLC, and HPLC coupled to UV and MS in the isolation of the chemically most interesting substances. Enumerated below are the compounds which have been isolated and structurally elucidated and whose bioactivities have been further characterized. 1. Agelas n.sp. secondary metabolites Extract of the unidentified Agelas sponge from Peniki East Island (Seribu Islands), Jakarta, yielded sixteen structurally related brominated pyrroles, including eleven new congeners. Diverse structures of the brominated pyrroles are elucidated wherein several new functionalities are shown to be introduced in the molecule such as in agelanin A (2), agelanin B (3), and agelanesins (4 to 7). Pronounced cytotoxicity against mouse lymphoma cell (L5178Y) was shown by all agelanesins. The tyramine moiety must be responsible for the cytotoxic activity since other congeners without the tyramine unit displayed no cell-growth inhibition. Less degree of bromination on the pyrrole ring may also play a role in its cytotoxicity, considering that the monobrominated pyrrole-agelanesins, agelanesin A (4) and B (5) display lower IC50 in comparison to their dibrominated congeners, agelanesin C (6) and D (7). The iodine substituent presumably is not important for the cytotoxicity. 2. Agelas nakamurai secondary metabolites Extract of the sponge Agelas nakamurai collected in Menjangan Island, yielded five monobrominated pyrrole derivatives, one of which is found to be a new congener, longamide C (20). A hypotaurocyamine diterpenoid, (+)-agelasidine C (19) was isolated together along with adenine related compounds, adenosine and 9-methyladenine as well as the new diterpenoids derivatves, (-)-agelasine-D (18) and its congener (-)-ageloxime-D (17). (-)-Agelasine D, (-)-ageloxime D and (+)-agelasidine-C exhibit prominent cytotoxicity towards the mouse lymphoma cell line L5178Y. Biofilm inhibition assay done on (-)-agelasine D, (-)-ageloxime D, (+)-agelasidine C as well as on (-)-agelasine I suggests that the diterpene part is important for the activity together with the adeninium part. Between the (-)-agelasine D and (-)-ageloxime D, the amine unit on C-6’ is important for the antibacterial activity. A replacement of the amine unit with an oxime group as in the ageloxime D will displace the antibacterial activity but on the other hand will inhibit biofilm-formation of S. epidermidis. Both (-)-agelasine-D and (-)-ageloxime D were toxic to the cyprids larva of Balanus improvisus Darwin, where (-)-ageloxime D was approximately 10 times more toxic than (-)-agelasine D. 3. Pseudoceratina purpurea secondary metabolites Extract of the sponge Pseudoceratina purpurea collected in Watudodol, Banyuwangi, yielded five brominated tyrosine derivatives. The presence of the antifouling substance, aplysamine-2 (27) as well as isofistularin-3-bioconversion products, (+)-aeroplysinin-1 (28), bisoxazolidinone derivatives (29), together with the dienone ketal congeners 30 and 31 were identified. 4. Axynissa sp. secondary metabolites Search on bioactive compounds as protein kinase inhibitors has lead to the isolation of two bisabolene phenol derivatives, (+)-curcuphenol (33) and (+)-curcudiol (34) in the active fractions of Axynissa sp. collected from Ambon, Maluku. 5. Mycale phyllophyla secondary metabolites Study on the sponge extract Mycale phyllophyla collected from Menjangan Island, Bali, revealed the presence of 5-pentadecyl-1H-pyrrole-2-carbaldehyde derivatives (32a) together with (E)-5-pentadec-6-enyl-1H-pyrrole-2-carbaldehyde (32b) in a cytotoxic active fraction. 6. Rhabdastrella rowi secondary metabolite The quinolin-4-ol (35) was obtained from the Balinese marine sponge Rhabdastrella rowi extract in minute quantity. Up to now this compound has only been obtained synthetically and has never been reported from natural sources.
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Publisher: Cuvillier Verlag
ISBN: 3736905602
Category : Science
Languages : de
Pages : 196
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Author: Harald Gross
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
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Author: Kate J. Graham
Publisher:
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Category :
Languages : en
Pages : 256
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Microbial organisms often produce biologically active and chemically intriguing secondary metabolites. To isolate and characterize compounds of novel activity and structure, bioassay- guided fractionations were employed on a variety of natural products sources. Active compounds were characterized by spectroscopic analysis and X-ray diffraction methods. As a result of these studies, six projects were completed, resulting in the purification of a diverse range of compounds containing activity in a variety of assays. A coumarin and parahydroxyphenylethanol were determined to possess phytotoxic activity from fungal pathogens. Two novel C-glycosidic compounds from a bacterial plant pathogen were found to be the first low molecular weight elicitors of the hypersensitive response in plants. A verticillin of the epi-polythiodiketopiperazine class isolated from a soil fungus was discovered to be responsible for inhibition of ras farnesylation transferase. Leafcutter ants were found to be deterred by the presence of a novel sesqualterpenoid in epiphylls. Finally, inhibitors of the PDGF receptor were isolated and characterized from a lichen.
Author: Jiayuan Liu
Publisher:
ISBN:
Category : Marine metabolites
Languages : en
Pages : 210
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Author: Mousa S. M. AlTarabeen
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Category :
Languages : en
Pages : 476
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Author: Georgios Daletos
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Languages : en
Pages : 0
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Author: Long Zhang
Publisher:
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Category : Bioactive compounds
Languages : en
Pages : 148
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The aim of this dissertation was to elaborate the exploration of biologically active secondary metabolites from the marine sponge Cacospongia cf. linteiformis collected from the Bahamas and the soft coral Briareum asbestinum collected from two different sites in Florida State, Boca Raton and Dry Tortugas. In chapter one, a review on previous chemical and biological studies of the marine sponge C. cf. linteiformis and soft coral B. asbestinum is provided. Particular attention is given to spongianolides and briarellins, two important classes of compounds isolated from C. cf. linteiformis and B. asbestinum, respectively, and their structural features and diverse bioactivities. In chapter two, the isolation and relative configuration determination of four epimeric sesterterpenoids, spongianolides E & F (18c, 18d, 19c, 19d) from C. cf. linteiformis collected from the Bahamas are discussed. Thanks to chemical modification (acetylation), diastereomeric 18c&18d and 19c&19d, respectively, were able to be isolated using chromatographic techniques for the first time, and then the relative configurations of 18c, 18d, 19c, 19d were determined based on NOESY NMR experiments. The bioactivity of mixture of compounds 18c, 18d, 19c, 19d were tested and it exhibited inhibition against Schnurri-3 (a regulator of postnatal bone mass). In chapter three, the isolation and structural elucidation of four new compounds, florellins A-D (49-52), from B. asbestinum collected off the coast of Boca Raton, FL are discussed. The molecular structures of these compounds were established by spectroscopic analysis. Compounds 49-52 are the first briarellins containing an acyl group at C-13, while 49 and 50 are the first briarellins possessing acylation at C-15. Florellins A-C (49-51) were screened and found cytotoxic against three human cell lines, BT474, WM266−4 and HEK293. In chapter four, the isolation and structural elucidation of four new compounds, florellins E-H (57-60), from B. asbestinum collected in Dry Tortugas, FL are discussed. The molecular structures of these compounds were established by spectroscopic analysis. Florellins F (58) and H (60) were screened against three human cell lines, BT474, WM266−4 and HEK293, but no cytotoxicity was exhibited. In chapter five, all the experimental procedures are described, including analytical instruments, animal materials, extraction and isolation processes, spectroscopic data and protocols of bioassays.
Author: Scott Patrick Wilkins
Publisher:
ISBN:
Category :
Languages : en
Pages : 426
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