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Martău GA, Călinoiu LF, Vodnar DC. Bio-vanillin: Towards a sustainable industrial production. Trends Food Sci Technol 2021. [DOI: 10.1016/j.tifs.2021.01.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Hanif N, Murni A, Tanaka C, Tanaka J. Marine Natural Products from Indonesian Waters. Mar Drugs 2019; 17:md17060364. [PMID: 31248122 PMCID: PMC6627775 DOI: 10.3390/md17060364] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 06/10/2019] [Accepted: 06/11/2019] [Indexed: 12/13/2022] Open
Abstract
Natural products are primal and have been a driver in the evolution of organic chemistry and ultimately in science. The chemical structures obtained from marine organisms are diverse, reflecting biodiversity of genes, species and ecosystems. Biodiversity is an extraordinary feature of life and provides benefits to humanity while promoting the importance of environment conservation. This review covers the literature on marine natural products (MNPs) discovered in Indonesian waters published from January 1970 to December 2017, and includes 732 original MNPs, 4 structures isolated for the first time but known to be synthetic entities, 34 structural revisions, 9 artifacts, and 4 proposed MNPs. Indonesian MNPs were found in 270 papers from 94 species, 106 genera, 64 families, 32 orders, 14 classes, 10 phyla, and 5 kingdoms. The emphasis is placed on the structures of organic molecules (original and revised), relevant biological activities, structure elucidation, chemical ecology aspects, biosynthesis, and bioorganic studies. Through the synthesis of past and future data, huge and partly undescribed biodiversity of marine tropical invertebrates and their importance for crucial societal benefits should greatly be appreciated.
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Affiliation(s)
- Novriyandi Hanif
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University (Bogor Agricultural University), Bogor 16680, Indonesia.
| | - Anggia Murni
- Tropical Biopharmaca Research Center, IPB University (Bogor Agricultural University), Bogor 16128, Indonesia.
| | - Chiaki Tanaka
- Department of Natural Products Chemistry, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan.
| | - Junichi Tanaka
- Department of Chemistry, Biology, and Marine Science, University of the Ryukyus, Nishihara, Okinawa 903-0213, Japan.
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Banerjee G, Chattopadhyay P. Vanillin biotechnology: the perspectives and future. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2019; 99:499-506. [PMID: 30094833 DOI: 10.1002/jsfa.9303] [Citation(s) in RCA: 106] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2018] [Revised: 08/05/2018] [Accepted: 08/05/2018] [Indexed: 05/09/2023]
Abstract
The biotechnological production of fragrances is a recent trend that has expanded rapidly in the last two decades. Vanillin is the second most popular flavoring agent after saffron and is extensively used in various applications, e.g., as a food additive in food and beverages and as a masking agent in various pharmaceutical formulations. It is also considered a valuable product for other applications, such as metal plating and the production of other flavoring agents, herbicides, ripening agents, antifoaming agents, and personal and home-use products (such as in deodorants, air fresheners, and floor-polishing agents). In general, three types of vanillin, namely natural, biotechnological, and chemical/synthetic, are available on the market. However, only natural and nature-identical (biotechnologically produced from ferulic acid only) vanillins are considered as food-grade additives by most food-safety control authorities worldwide. In the present review, we summarize recent trends in fermentation technology for vanillin production and discuss the importance of the choice of raw materials for the economically viable production of vanillin. We also describe the key enzymes used in the biotechnological production of vanillin as well as their underlying genes. Research to advance our understanding of the molecular regulation of different pathways involved in vanillin production from ferulic acid is still ongoing. The enhanced knowledge is expected to offer new opportunities for the application of metabolic engineering to optimize the production of nature-identical vanillin. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Goutam Banerjee
- Department of Biochemistry, University of Calcutta, Kolkata, India
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Alahdal AM, Asfour HZ, Ahmed SA, Noor AO, Al-Abd AM, Elfaky MA, Elhady SS. Anti-Helicobacter, Antitubercular and Cytotoxic Activities of Scalaranes from the Red Sea Sponge Hyrtios erectus. Molecules 2018; 23:molecules23040978. [PMID: 29690588 PMCID: PMC6017761 DOI: 10.3390/molecules23040978] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 11/16/2022] Open
Abstract
The Red Sea specimen of the marine sponge Hyrtios erectus (order Dictyoceratida) was found to contain scalarane-type sesterterpenes. 12-O-deacetyl-12,19-di-epi-scalarin (14), a new scalarane sesterterpenoid, along with fourteen previously-reported scalarane-type sesterterpenes (1–13 and 15) have been isolated. The chemical structures of the isolated compounds were elucidated on the basis of detailed 1D and 2D NMR spectral data and mass spectroscopy, as well as by comparison with reported data. The anti-Helicobacter pylori, antitubercular and cytotoxic activities of all fifteen compounds were evaluated to reveal the potency of Compounds 1, 2, 3, 4, 6, 7 and 10. Amongst these, Compounds 1, 3, 4, 6 and 10 displayed a promising bioactivity profile, possessing potent activities in the antitubercular and anti-H. pylori bioassay. Compounds 2 and 7 showed the most promising cytotoxic profile, while Compounds 1 and 10 showed a moderate cytotoxic profile against MCF-7, HCT-116 and HepG2 cell lines.
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Affiliation(s)
- Abdulrahman M Alahdal
- Department of Clinical Pharmacy, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Hani Z Asfour
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, Princess Al-Jawhara Center of Excellence in Research of Hereditary Disorders, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Safwat A Ahmed
- Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt.
| | - Ahmad O Noor
- Department of Clinical Pharmacy, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Ahmed M Al-Abd
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Mahmoud A Elfaky
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
| | - Sameh S Elhady
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
- Department of Pharmacognosy, Faculty of Pharmacy, Port Said University, Port Said 42526, Egypt.
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Kaweetripob W, Mahidol C, Wongbundit S, Tuntiwachwuttikul P, Ruchirawat S, Prawat H. Sesterterpenes and phenolic alkenes from the Thai sponge Hyrtios erectus. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.11.073] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shady NH, El-Hossary EM, Fouad MA, Gulder TAM, Kamel MS, Abdelmohsen UR. Bioactive Natural Products of Marine Sponges from the Genus Hyrtios. Molecules 2017; 22:E781. [PMID: 28492499 PMCID: PMC6153753 DOI: 10.3390/molecules22050781] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 04/28/2017] [Accepted: 05/08/2017] [Indexed: 02/06/2023] Open
Abstract
Marine sponges are known as a rich source for novel bioactive compounds with valuable pharmacological potential. One of the most predominant sponge genera is Hyrtios, reported to have various species such as Hyrtios erectus, Hyrtios reticulatus, Hyrtios gumminae, Hyrtios communis, and Hyrtios tubulatus and a number of undescribed species. Members of the genus Hyrtios are a rich source of natural products with diverse and valuable biological activities, represented by different chemical classes including alkaloids, sesterterpenes and sesquiterpenes. This review covers the literature until June 2016, providing a complete survey of all compounds isolated from the genus Hyrtios with their corresponding biological activities whenever applicable.
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Affiliation(s)
- Nourhan Hisham Shady
- Department of Pharmacognosy, Faculty of Pharmacy, Deraya University, Universities Zone, P.O. Box 61111 New Minia City, Minia, Egypt.
| | - Ebaa M El-Hossary
- National Centre for Radiation Research & Technology, Egyptian Atomic Energy Authority, Ahmed El-Zomor St. 3, El-Zohoor Dist., P.O. Box 29 Nasr City, Cairo, Egypt.
| | - Mostafa A Fouad
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, Egypt.
| | - Tobias A M Gulder
- Department of Chemistry and Center for Integrated Protein Science Munich (CIPSM), Technische Universität München, Lichtenbergstraβe 4, 85748 Garching, Germany.
| | - Mohamed Salah Kamel
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, Egypt.
| | - Usama Ramadan Abdelmohsen
- Department of Pharmacognosy, Faculty of Pharmacy, Minia University, 61519 Minia, Egypt.
- Department of Botany II, Julius-von-Sachs Institute for Biological Sciences, University of Würzburg, Julius-von-Sachs-Platz 3, 97082 Würzburg, Germany.
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New marine natural products from sponges (Porifera) of the order Dictyoceratida (2001 to 2012); a promising source for drug discovery, exploration and future prospects. Biotechnol Adv 2016; 34:473-491. [PMID: 26802363 DOI: 10.1016/j.biotechadv.2015.12.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Revised: 12/15/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
Abstract
The discovery of new drugs can no longer rely primarily on terrestrial resources, as they have been heavily exploited for over a century. During the last few decades marine sources, particularly sponges, have proven to be a most promising source of new natural products for drug discovery. This review considers the order Dictyoceratida in the Phylum Porifera from which the largest number of new marine natural products have been reported over the period 2001-2012. This paper examines all the sponges from the order Dictyoceratida that were reported as new compounds during the time period in a comprehensive manner. The distinctive physical characteristics and the geographical distribution of the different families are presented. The wide structural diversity of the compounds produced and the variety of biological activities they exhibited is highlighted. As a representative of sponges, insights into this order and avenues for future effective natural product discovery are presented. The research institutions associated with the various studies are also highlighted with the aim of facilitating collaborative relationships, as well as to acknowledge the major international contributors to the discovery of novel sponge metabolites. The order Dictyoceratida is a valuable source of novel chemical structures which will continue to contribute to a new era of drug discovery.
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A New Bioactive Metabolite Isolated from the Red Sea Marine Sponge Hyrtios erectus. Molecules 2016; 21:82. [PMID: 26784155 PMCID: PMC6273094 DOI: 10.3390/molecules21010082] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Revised: 01/05/2016] [Accepted: 01/08/2016] [Indexed: 12/21/2022] Open
Abstract
Chemical investigation of the lipophilic fraction of Hyrtios erectus, a Red Sea sponge, yielded a new pentacyclic nitrogen-containing scalarane; 24-methoxypetrosaspongia C (1), together with the previously reported scalaranes sesterstatin 3 (2), 12-deacetyl-12-epi-scalaradial (3) and 12-deacetyl-12,18-di-epi-scalaradial (4). The compounds were identified using HRESIMS, 1D and 2D NMR experiments. The isolated compounds showed growth inhibitory activity against hepatocellular carcinoma (HepG2), colorectal carcinoma (HCT-116) and breast adenocarcinoma cells (MCF-7).
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He WF, Xue DQ, Yao LG, Li JY, Li J, Guo YW. Hainanerectamines A-C, alkaloids from the Hainan sponge Hyrtios erecta. Mar Drugs 2014; 12:3982-93. [PMID: 24983641 PMCID: PMC4113810 DOI: 10.3390/md12073982] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 05/28/2014] [Accepted: 06/03/2014] [Indexed: 11/16/2022] Open
Abstract
Two new indole alkaloids, hainanerectamines A (1) and B (2), and one new β-carboline alkaloids, hainanerectamines C (4), along with five known related alkaloids (3, 5-8), have been isolated from the Hainan marine sponge Hyrtios erecta. The structures of new compounds 1, 2 and 4 were determined by detailed analysis of their 1D and 2D NMR spectra and by comparison of their spectroscopic data with those of related model compounds. Compounds 2-4 exhibited moderate inhibitory activity against Aurora A, a member of serine/threonine kinase family involving in the regulation of cell division and a new target in cancer treatment, with IC50 values of 24.5, 13.6, and 18.6 μg/mL, respectively.
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Affiliation(s)
- Wen-Fei He
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China.
| | - Duo-Qing Xue
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
| | - Li-Gong Yao
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
| | - Jing-Ya Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
| | - Jia Li
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.
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Yang F, Gan JH, Liu XY, Lin HW. Scalarane Sesterterpenes from the Paracel Islands Marine Sponge Hyrtios sp. Nat Prod Commun 2014. [DOI: 10.1177/1934578x1400900608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A new scalarane sesterterpene, sesterstamide (1), together with four known sesterterpenes (2–5), were isolated from the Paracel Islands marine sponge Hyrtios sp. The chemical structures were established on the basis of spectroscopic analysis and comparison with known compounds. The cytotoxic and antileishmanial activities of the isolated compounds were also evaluated.
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Affiliation(s)
- Fan Yang
- Research Center for Marine Drugs, Department of Pharmacy, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai 200127, P.R. China
| | - Jian-Hong Gan
- College of Food Science &Technology, Shanghai Ocean University, 999 Hucheng Huan Road, Shanghai 201306, P.R. China
| | - Xiao-Yan Liu
- Research Center for Marine Drugs, Department of Pharmacy, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai 200127, P.R. China
| | - Hou-Wen Lin
- Research Center for Marine Drugs, Department of Pharmacy, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai 200127, P.R. China
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Mahidol C, Prawat H, Sangpetsiripan S, Ruchirawat S. Bioactive scalaranes from the Thai sponge Hyrtios gumminae. JOURNAL OF NATURAL PRODUCTS 2009; 72:1870-1874. [PMID: 19788270 DOI: 10.1021/np900267v] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Chemical investigation of the Thai sponge Hyrtios gumminae collected from Similan Island in the Andaman Sea, Thailand, yielded four new sesterterpenoids, similan A (1), 12beta,20-dihydroxy-16beta-acetoxy-17-scalaren-19,20-olide (2), 12beta-acetoxy-20-hydroxy-17-scalaren-19,20-olide (3), and 12beta,16alpha,20-trihydroxy-17-scalaren-19,20-olide (4), together with seven known compounds. The structures of these new compounds were elucidated on the basis of their spectroscopic data and chemical transformations. Some of the isolated compounds were tested for their cytotoxic activity.
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Affiliation(s)
- Chulabhorn Mahidol
- Chulabhorn Research Institute, Vipavadee Rangsit Highway, Bangkok 10210, Thailand
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Youssef DTA, Shaala LA, Emara S. Antimycobacterial scalarane-based sesterterpenes from the Red Sea sponge Hyrtios erecta. JOURNAL OF NATURAL PRODUCTS 2005; 68:1782-4. [PMID: 16378375 DOI: 10.1021/np0502645] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
A new scalarane-type pentacyclic sesterterpene, sesterstatin 7 (1), was isolated from the Red Sea sponge Hyrtios erecta, together with 16-epi-scalarolbutenolide (2), 25-dehydroxy-12-epi-deacetylscalarin (3), 3-acetylsesterstatin 1 (4), and 21-acetoxydeoxyscalarin. The structure of 1 was elucidated by spectroscopic data interpretation. Sesterstatin 7 (1) showed 63% inhibition of Mycobacterium tuberculosis (H(37)Rv) at a concentration of 6.25 microg/mL. Compound 2 displayed moderate inhibitory activity, while 3 and 4 were weakly active against the same biological target.
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Affiliation(s)
- Diaa T A Youssef
- Department of Pharmacognosy and Department of Pharmaceutical Analytical Chemistry, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt
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Youssef DTA. Hyrtioerectines A-C, cytotoxic alkaloids from the red sea sponge hyrtioserectus. JOURNAL OF NATURAL PRODUCTS 2005; 68:1416-9. [PMID: 16180827 DOI: 10.1021/np050142c] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A Red Sea specimen of the marine sponge Hyrtios erectus was found to contain three new alkaloids, hyrtioerectines A-C (1-3). Hyrtioerectine A (1) possesses the carbon bond-linked moieties 6-hydroxy beta-carboline and 6-hydroxyindole. The structure elucidation of 1-3 was based on intensive study of their spectral data including 1D (1H and 13C) and 2D (1H-1H COSY, HOHAHA, NOESY, ROESY, HMQC, and HMBC) NMR, together with high-resolution mass spectra. Hyrtioerectines A-C were moderately cytotoxic.
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Affiliation(s)
- Diaa T A Youssef
- Department of Pharmacognosy, Faculty of Pharmacy, Suez Canal University, Ismailia 41522, Egypt.
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Sata N, Galario MA, Sitachitta N, Scheuer PJ, Kelly M. Poipuol, a new metabolite from a Hawaiian sponge of the genus Hyrtios. JOURNAL OF NATURAL PRODUCTS 2005; 68:262-263. [PMID: 15730258 DOI: 10.1021/np0496789] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new metabolite, poipuol (1), was isolated from an undescribed marine sponge Hyrtios sp. collected in Kauai Island, Hawaii. The structure was determined from spectroscopic data.
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Affiliation(s)
- Noriko Sata
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA
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Qiu Y, Deng Z, Pei Y, Fu H, Li J, Proksch P, Lin W. Sesterterpenoids from the marine sponge Hyrtios erectus. JOURNAL OF NATURAL PRODUCTS 2004; 67:921-924. [PMID: 15165168 DOI: 10.1021/np030457x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Four new sesterterpenes, namely, (+)-20-formylhyrtiosal (1), (+)-16-O-acetyl-20-formylhyrtiosal (2), 12-alpha-O-acetylhyrtiolide (3), and 5,10-dihydroxyfurospinulosine-1 (4), together with seven known sesterterpenes (5-11) were isolated from the marine sponge Hyrtios erectus collected at Hainan, China. The structures were elucidated on the basis of extensive spectroscopic analysis involving mainly one- and two-dimensional NMR as well as mass spectroscopy.
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Affiliation(s)
- Yan Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100083, Beijing, People's Republic of China
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Salmoun M, Devijver C, Daloze D, Braekman JC, van Soest RWM. 5-hydroxytryptamine-derived alkaloids from two marine sponges of the genus Hyrtios. JOURNAL OF NATURAL PRODUCTS 2002; 65:1173-1176. [PMID: 12193025 DOI: 10.1021/np020009+] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Indonesian specimens of the marine sponges Hyrtios erectus and H. reticulatus were found to contain 5-hydroxytryptamine-derived alkaloids. Their structures were determined on the basis of their spectral properties. H. erectus contained hyrtiosulawesine (4), a new beta-carboline alkaloid, together with the already known alkaloids 5-hydroxyindole-3-carbaldehyde (1), hyrtiosin B (2), and 5-hydroxy-3-(2-hydroxyethyl)indole (3). H. reticulatus contained the novel derivative 1,6-dihydroxy-1,2,3,4-tetrahydro-beta-carboline (11) together with serotonin (5), 6-hydroxy-1-methyl-1,2,3,4-tetrahydro-beta-carboline (7), and 6-hydroxy-3,4-dihydro-1-oxo-beta-carboline (9).
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Affiliation(s)
- Mostafa Salmoun
- Laboratory of Bio-organic Chemistry, Department of Organic Chemistry, Faculty of Sciences, CP 160/06, University of Brussels, 50 Av. F.D. Roosevelt, Belgium
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