1
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Dugan D, Bell RJ, Brkljača R, Rix C, Urban S. A Review of the Ethnobotanical Use, Chemistry and Pharmacological Activities of Constituents Derived from the Plant Genus Geijera ( Rutaceae). Metabolites 2024; 14:81. [PMID: 38392973 DOI: 10.3390/metabo14020081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Revised: 01/16/2024] [Accepted: 01/17/2024] [Indexed: 02/25/2024] Open
Abstract
Geijera Schott is a plant genus of the Rutaceae Juss. (rue and citrus) family, comprising six species which are all native to Oceania. Of the plants belonging to this genus, the most significant species that has a customary use is Geijera parviflora, which was used by Indigenous Australians, primarily as a pain reliever. Herein, a comprehensive review of the literature published on the genus Geijera from 1930 to 2023 was conducted. This is the first review for this plant genus, and it highlights the chemical constituents reported to date, together with the range of pharmacological properties described from the various species and different parts of the plant. These properties include anti-inflammatory, anti-microbial, anti-parasitic, insect repellent, analgesic, neuroactive, and anti-cancer activities. Finally, a reflection on some of the important areas for future focused studies of this plant genus is provided.
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Affiliation(s)
- Deepika Dugan
- Marine and Terrestrial Natural Product (MATNAP) Research Group, School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
| | - Rachael J Bell
- Marine and Terrestrial Natural Product (MATNAP) Research Group, School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
| | - Robert Brkljača
- Monash Biomedical Imaging, Monash University, Clayton, VIC 3168, Australia
| | - Colin Rix
- Marine and Terrestrial Natural Product (MATNAP) Research Group, School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
| | - Sylvia Urban
- Marine and Terrestrial Natural Product (MATNAP) Research Group, School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia
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2
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Tashkandi J, Brkljača R, Alt K. Progress in magnetic particle imaging signal and iron quantification methods in vivo - application to long circulating SPIONs. Nanoscale Adv 2023; 5:4873-4880. [PMID: 37705773 PMCID: PMC10496917 DOI: 10.1039/d3na00260h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 08/17/2023] [Indexed: 09/15/2023]
Abstract
The strengths of Magnetic Particle Imaging (MPI) lay in its sensitivity, quantitative nature, and lack of signal attenuation for Superparamagnetic Iron Oxide Nanoparticles (SPION). These advantages make MPI a powerful tool for the non-invasive monitoring of tracer behaviour over time. With more MPI studies emerging, a standardized method for determining the boundaries of a region of interest (ROI) and iron quantification is crucial. The current approaches are inconsistent, making it challenging to compare studies, hindering MPI progression. Here we showcase three different ROI selection methods for the quantification of iron in vivo and ex vivo. Healthy mice were intravenously administered a long circulating tracer, never before applied in MPI, and the ROI methods were tested for their ability to accurately quantify the total signal present, in addition to the accumulation of the tracer in individual organs. We discuss how the quantified iron amount can be vastly altered based on the choice of ROI, the importance of the standard curve and the challenges associated with each method. Lastly, the user variability and accuracy of each method was compared by 3 independent users to ensure their consistency and lack of bias.
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Affiliation(s)
- Jurie Tashkandi
- Australian Centre for Blood Diseases, Central Clinical School, Monash University Australia
| | | | - Karen Alt
- Australian Centre for Blood Diseases, Central Clinical School, Monash University Australia
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3
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Lever J, Kreuder F, Henry J, Hung A, Allard PM, Brkljača R, Rix C, Taki AC, Gasser RB, Kaslin J, Wlodkowic D, Wolfender JL, Urban S. Targeted Isolation of Antibiotic Brominated Alkaloids from the Marine Sponge Pseudoceratina durissima Using Virtual Screening and Molecular Networking. Mar Drugs 2022; 20:md20090554. [PMID: 36135743 PMCID: PMC9503778 DOI: 10.3390/md20090554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 08/22/2022] [Accepted: 08/25/2022] [Indexed: 11/23/2022] Open
Abstract
Many targeted natural product isolation approaches rely on the use of pre-existing bioactivity information to inform the strategy used for the isolation of new bioactive compounds. Bioactivity information can be available either in the form of prior assay data or via Structure Activity Relationship (SAR) information which can indicate a potential chemotype that exhibits a desired bioactivity. The work described herein utilizes a unique method of targeted isolation using structure-based virtual screening to identify potential antibacterial compounds active against MRSA within the marine sponge order Verongiida. This is coupled with molecular networking-guided, targeted isolation to provide a novel drug discovery procedure. A total of 12 previously reported bromotyrosine-derived alkaloids were isolated from the marine sponge species Pseudoceratina durissima, and the compound, (+)-aeroplysinin-1 (1) displayed activity against the MRSA pathogen (MIC: <32 µg/mL). The compounds (1−3, 6 and 9) were assessed for their central nervous system (CNS) interaction and behavioral toxicity to zebrafish (Danio rerio) larvae, whereby several of the compounds were shown to induce significant hyperactivity. Anthelmintic activity against the parasitic nematode Haemonchus contorutus was also evaluated (2−4, 6−8).
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Affiliation(s)
- James Lever
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476 Melbourne, VIC 3001, Australia
| | - Florian Kreuder
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC 3800, Australia
| | - Jason Henry
- Neurotoxicology Lab., School of Science (Biosciences), RMIT University, Bundoora, VIC 3083, Australia
| | - Andrew Hung
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476 Melbourne, VIC 3001, Australia
| | | | - Robert Brkljača
- Monash Biomedical Imaging, Monash University, Clayton, VIC 3168, Australia
| | - Colin Rix
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476 Melbourne, VIC 3001, Australia
| | - Aya C. Taki
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agriculture Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Robin B. Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agriculture Sciences, The University of Melbourne, Parkville, VIC 3010, Australia
| | - Jan Kaslin
- Australian Regenerative Medicine Institute, Monash University, Clayton, VIC 3800, Australia
| | - Donald Wlodkowic
- Neurotoxicology Lab., School of Science (Biosciences), RMIT University, Bundoora, VIC 3083, Australia
| | - Jean-Luc Wolfender
- School of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Rue Michel-Servet 1, 1211 Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, 1211 Geneva, Switzerland
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476 Melbourne, VIC 3001, Australia
- Correspondence:
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4
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Norman EO, Hombsch S, Lever J, Brkljača R, White J, Gasser RB, Taki AC, Urban S. Phytochemical Profiling and Biological Testing of the Constituents of the Australian Plant Haemodorum brevisepalum. J Nat Prod 2021; 84:2832-2844. [PMID: 34780692 DOI: 10.1021/acs.jnatprod.1c00509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Phytochemical profiling was undertaken on the crude extracts of the bulbs, stems, and the fruits of Haemodorum brevisepalum, to determine the nature of the chemical constituents present. This represents the first study to investigate the fruits of a species of Haemodorum. In total, 13 new and 17 previously reported compounds were isolated and identified. The new compounds were of the phenylphenalenone-type class, with a representative of a novel structural form, named tentatively "oxabenzochromenone" (1), a compound akin to an intermediate in a recently proposed phenylphenalenone metabolic network (2), seven new phenylphenalenones (4-10), four new phenylbenzoisochromenones (11-14), and a new phenylbenzoisochromenone derivative (18). The previously reported compounds identified were of the following structure classes: oxabenzochrysenone (3, 23-26), flavonol (15, 16), phenylbenzoisochromenone (17, 21, 22, 27-30), and phenylphenalenone (19, 20). Compounds 2-4, 6-9, 15-18, 21, 22, and 26 were subjected to antimicrobial evaluation with moderate activity observed against Staphylococcus aureus MRSA and slight activity against Pseudomonas aeruginosa and Candida albicans. Compounds 4, 6-9, 17, and 21 were also evaluated for anthelminthic activity against larvae of the blood-feeding parasitic nematode Haemonchus contortus.
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Affiliation(s)
- Edward Owen Norman
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Stuart Hombsch
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - James Lever
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Robert Brkljača
- Monash Biomedical Imaging, Monash University, Clayton, Victoria 3168, Australia
| | - Jonathan White
- School of Chemistry and Bio21 Institute, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | - Robin B Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Aya C Taki
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia
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5
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Lever J, Brkljača R, Rix C, Urban S. Application of Networking Approaches to Assess the Chemical Diversity, Biogeography, and Pharmaceutical Potential of Verongiida Natural Products. Mar Drugs 2021; 19:582. [PMID: 34677481 PMCID: PMC8539549 DOI: 10.3390/md19100582] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Revised: 10/13/2021] [Accepted: 10/14/2021] [Indexed: 02/06/2023] Open
Abstract
This study provides a review of all isolated natural products (NPs) reported for sponges within the order Verongiida (1960 to May 2020) and includes a comprehensive compilation of their geographic and physico-chemical parameters. Physico-chemical parameters were used in this study to infer pharmacokinetic properties as well as the potential pharmaceutical potential of NPs from this order of marine sponge. In addition, a network analysis for the NPs produced by the Verongiida sponges was applied to systematically explore the chemical space relationships between taxonomy, secondary metabolite and drug score variables, allowing for the identification of differences and correlations within a dataset. The use of scaffold networks as well as bipartite relationship networks provided a platform to explore chemical diversity as well as the use of chemical similarity networks to link pharmacokinetic properties with structural similarity. This study paves the way for future applications of network analysis procedures in the field of natural products for any order or family.
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Affiliation(s)
- James Lever
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia; (J.L.); (C.R.)
| | - Robert Brkljača
- Monash Biomedical Imaging, Monash University, Clayton, VIC 3168, Australia;
| | - Colin Rix
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia; (J.L.); (C.R.)
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Sciences), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia; (J.L.); (C.R.)
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6
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Norman EO, Tuohey H, Pizzi D, Saidah M, Bell R, Brkljača R, White JM, Gasser RB, Taki AC, Urban S. Correction to Phytochemical Profiling and Biological Activity of the Australian Carnivorous Plant, Drosera magna. J Nat Prod 2021; 84:2067. [PMID: 34160223 DOI: 10.1021/acs.jnatprod.1c00497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
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7
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Norman EO, Tuohey H, Pizzi D, Saidah M, Bell R, Brkljača R, White JM, Gasser RB, Taki AC, Urban S. Phytochemical Profiling and Biological Activity of the Australian Carnivorous Plant, Drosera magna. J Nat Prod 2021; 84:964-971. [PMID: 33631073 DOI: 10.1021/acs.jnatprod.0c00869] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Phytochemical profiling was undertaken on the crude extracts of Drosera magna to determine the nature of the chemical constituents present. In total, three new flavonol diglycosides (1-3), one new flavan-3-ol glycoside (4), and 12 previously reported compounds of the flavonol (5, 9), flavan-3-ol (15), flavanone (8), 1,4-napthoquinone (6, 7, 13, 14), 2,3-dehydroxynapthalene-1,4-dione (10-12), and phenolic acid (16) structure classes were isolated and identified. Compounds 1-9, 13, 17, and 18 were assessed for antimicrobial activity, with compounds 6, 7, 8, and 9 showing significant activity. Compounds 1, 2, and 6 were also evaluated for anthelmintic activity against larval forms of Hemonchus contortus, with compound 6 being active.
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Affiliation(s)
- Edward Owen Norman
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476 Melbourne, Victoria 3001, Australia
| | - Hayden Tuohey
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476 Melbourne, Victoria 3001, Australia
| | - David Pizzi
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Milane Saidah
- Aix-Marseille Université, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| | - Rachael Bell
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476 Melbourne, Victoria 3001, Australia
| | - Robert Brkljača
- Monash Biomedical Imaging, Monash University, Clayton, Victoria 3168, Australia
| | - Jonathan M White
- School of Chemistry and Bio21 Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Robin B Gasser
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Aya C Taki
- Department of Veterinary Biosciences, Melbourne Veterinary School, Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476 Melbourne, Victoria 3001, Australia
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8
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Trevorah R, Huynh T, Brkljača R, Othman MZ. Structural and Morphological Analysis of Cellulose Pulp Produced from the Fractionation of Eucalyptus obliqua Sawdust Using γ-Valerolactone. ACS Omega 2021; 6:4126-4136. [PMID: 33644535 PMCID: PMC7906597 DOI: 10.1021/acsomega.0c03616] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
Organic solvents offer promising methods for the fractionation of Eucalyptus obliqua lignocellulosic biomass. This study investigated the impact of γ-valerolactone (GVL) fractionation on the morphology of cellulose and its internal structure using scanning electron microscopy (SEM), nuclear magnetic resonance (NMR) and Fourier-transform infrared (FT-IR) spectroscopy. The solubilized lignin precipitated on the macrofibril surface as lignin spheres. GVL fractionation significantly increased the crystallinity of the recovered pulps from 0.29 for the sawdust to an average of 0.53 and a maximum of 0.66. The main states of cellulose that were susceptible to hydrolysis during the fractionation were amorphous and surface cellulose, both of which were reduced significantly, while paracrystalline and pure crystalline fractions in the pulp increased. It was concluded that GVL fractionation can produce a crystalline cellulose pulp of high quality suitable for further processing.
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Affiliation(s)
- Raymond
M. Trevorah
- School
of Engineering, RMIT University, P.O. Box 2476, Melbourne 3001, Australia
| | - Tien Huynh
- School
of Science, RMIT University, P.O. Box 71, Bundoora 3083, Australia
| | - Robert Brkljača
- School
of Science, RMIT University, P.O. Box 71, Bundoora 3083, Australia
| | - Maazuza Z. Othman
- School
of Engineering, RMIT University, P.O. Box 2476, Melbourne 3001, Australia
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9
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Pourjavaheri F, Ostovar Pour S, Jones OA, Smooker PM, Brkljača R, Sherkat F, Blanch EW, Gupta A, Shanks RA. Extraction of keratin from waste chicken feathers using sodium sulfide and l-cysteine. Process Biochem 2019. [DOI: 10.1016/j.procbio.2019.04.010] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Ren G, Zhang BY, Yao Q, Zavabeti A, Huertas CS, Brkljača R, Khan MW, Nili H, Datta RS, Khan H, Jannat A, Walia S, Haque F, O'Dell LA, Wang Y, Zhu L, Mitchell A, Ou JZ. An Ultrasensitive Silicon Photonic Ion Sensor Enabled by 2D Plasmonic Molybdenum Oxide. Small 2019; 15:e1805251. [PMID: 30677221 DOI: 10.1002/smll.201805251] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Indexed: 06/09/2023]
Abstract
Silicon photonics has demonstrated great potential in ultrasensitive biochemical sensing. However, it is challenging for such sensors to detect small ions which are also of great importance in many biochemical processes. A silicon photonic ion sensor enabled by an ionic dopant-driven plasmonic material is introduced here. The sensor consists of a microring resonator (MRR) coupled with a 2D restacked layer of near-infrared plasmonic molybdenum oxide. When the 2D plasmonic layer interacts with ions from the environment, a strong change in the refractive index results in a shift in the MRR resonance wavelength and simultaneously the alteration of plasmonic absorption leads to the modulation of MRR transmission power, hence generating dual sensing outputs which is unique to other optical ion sensors. Proof-of-concept via a pH sensing model is demonstrated, showing up to 7 orders improvement in sensitivity per unit area across the range from 1 to 13 compared to those of other optical pH sensors. This platform offers the unique potential for ultrasensitive and robust measurement of changes in ionic environment, generating new modalities for on-chip chemical sensors in the micro/nanoscale.
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Affiliation(s)
- Guanghui Ren
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Bao Yue Zhang
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Qifeng Yao
- Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing, 100192, China
| | - Ali Zavabeti
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
- College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Ave., Nanjing, 211100, Nanjing, China
| | - Cesar S Huertas
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Robert Brkljača
- School of Science, RMIT University, Melbourne, VIC, 3001, Australia
| | | | - Hussein Nili
- Department of Electrical and Computer Engineering, University of California Santa Barbara, Santa Barbara, CA, 93106, USA
| | - Robi S Datta
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Hareem Khan
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Azmira Jannat
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Sumeet Walia
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Farjana Haque
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Geelong, VIC, 3220, Australia
| | - Yichao Wang
- School of Life and Environmental Sciences, Deakin University, Geelong, VIC, 3220, Australia
| | - Lianqing Zhu
- Key Laboratory of the Ministry of Education for Optoelectronic Measurement Technology and Instrument, Beijing Information Science & Technology University, Beijing, 100192, China
| | - Arnan Mitchell
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Jian Zhen Ou
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
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11
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Esrafilzadeh D, Zavabeti A, Jalili R, Atkin P, Choi J, Carey BJ, Brkljača R, O'Mullane AP, Dickey MD, Officer DL, MacFarlane DR, Daeneke T, Kalantar-Zadeh K. Room temperature CO 2 reduction to solid carbon species on liquid metals featuring atomically thin ceria interfaces. Nat Commun 2019; 10:865. [PMID: 30808867 PMCID: PMC6391491 DOI: 10.1038/s41467-019-08824-8] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 01/28/2019] [Indexed: 11/16/2022] Open
Abstract
Negative carbon emission technologies are critical for ensuring a future stable climate. However, the gaseous state of CO2 does render the indefinite storage of this greenhouse gas challenging. Herein, we created a liquid metal electrocatalyst that contains metallic elemental cerium nanoparticles, which facilitates the electrochemical reduction of CO2 to layered solid carbonaceous species, at a low onset potential of −310 mV vs CO2/C. We exploited the formation of a cerium oxide catalyst at the liquid metal/electrolyte interface, which together with cerium nanoparticles, promoted the room temperature reduction of CO2. Due to the inhibition of van der Waals adhesion at the liquid interface, the electrode was remarkably resistant to deactivation via coking caused by solid carbonaceous species. The as-produced solid carbonaceous materials could be utilised for the fabrication of high-performance capacitor electrodes. Overall, this liquid metal enabled electrocatalytic process at room temperature may result in a viable negative emission technology. While CO2 reduction proves an appealing means to convert greenhouse emissions to high-value products, there are few materials capable of such a conversion. Here, the authors demonstrate a liquid-metal electrocatalyst to convert CO2 directly into solid carbon that can be used as capacitor electrodes.
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Affiliation(s)
- Dorna Esrafilzadeh
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia. .,Graduate School of Biomedical Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
| | - Ali Zavabeti
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia.,College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, 29 Jiangjun Ave, 211100, Nanjing, China
| | - Rouhollah Jalili
- School of Chemical Engineering, University of New South Wales (UNSW), Sydney, NSW, 2031, Australia
| | - Paul Atkin
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia
| | - Jaecheol Choi
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Benjamin J Carey
- Institute of Physics and Center for Nanotechnology, University of Münster, Wilhelm-Klemm-Straße 10, 48149, Münster, Germany
| | - Robert Brkljača
- School of Science, RMIT University, Melbourne, VIC, 3001, Australia
| | - Anthony P O'Mullane
- School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology (QUT), Brisbane, QLD, 4001, Australia
| | - Michael D Dickey
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, 27607, USA
| | - David L Officer
- ARC Centre of Excellence for Electromaterials Science and Intelligent Polymer Research Institute, University of Wollongong, Wollongong, NSW, 2522, Australia
| | - Douglas R MacFarlane
- ARC Centre of Excellence for Electromaterials Science, Monash University, Clayton, VIC, 3800, Australia
| | - Torben Daeneke
- School of Chemical Engineering, University of New South Wales (UNSW), Sydney, NSW, 2031, Australia.
| | - Kourosh Kalantar-Zadeh
- School of Engineering, RMIT University, Melbourne, VIC, 3001, Australia. .,School of Chemical Engineering, University of New South Wales (UNSW), Sydney, NSW, 2031, Australia.
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12
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Norman EO, Lever J, Brkljača R, Urban S. Distribution, biosynthesis, and biological activity of phenylphenalenone-type compounds derived from the family of plants, Haemodoraceae. Nat Prod Rep 2019; 36:753-768. [DOI: 10.1039/c8np00067k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This review provides a summary of the current state of research concerning the unique specialised metabolites from Haemodoraceae.
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Affiliation(s)
- Edward Owen Norman
- School of Science (Applied Chemistry and Environmental Science)
- RMIT University
- Melbourne
- Australia
| | - James Lever
- School of Science (Applied Chemistry and Environmental Science)
- RMIT University
- Melbourne
- Australia
| | - Robert Brkljača
- School of Science (Applied Chemistry and Environmental Science)
- RMIT University
- Melbourne
- Australia
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Science)
- RMIT University
- Melbourne
- Australia
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13
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Singleton C, Brkljača R, Urban S. Absolute Configuration Determination of Retroflexanone Using the Advanced Mosher Method and Application of HPLC-NMR. Mar Drugs 2018; 16:E205. [PMID: 29895761 PMCID: PMC6025468 DOI: 10.3390/md16060205] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 01/01/2023] Open
Abstract
The absolute configuration of retroflexanone (1) and a closely related phlorogluinol (2) was established using the advanced Mosher method and by application of HPLC-NMR. HPLC-NMR permitted a small scale Mosher method analysis to be carried out on these unstable phloroglucinols.
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Affiliation(s)
- Caleb Singleton
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.
| | - Robert Brkljača
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, VIC 3001, Australia.
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14
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Daeneke T, Dahr N, Atkin P, Clark RM, Harrison CJ, Brkljača R, Pillai N, Zhang BY, Zavabeti A, Ippolito SJ, Berean KJ, Ou JZ, Strano MS, Kalantar-Zadeh K. Surface Water Dependent Properties of Sulfur-Rich Molybdenum Sulfides: Electrolyteless Gas Phase Water Splitting. ACS Nano 2017; 11:6782-6794. [PMID: 28612609 DOI: 10.1021/acsnano.7b01632] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Sulfur-rich molybdenum sulfides are an emerging class of inorganic coordination polymers that are predominantly utilized for their superior catalytic properties. Here we investigate surface water dependent properties of sulfur-rich MoSx (x = 32/3) and its interaction with water vapor. We report that MoSx is a highly hygroscopic semiconductor, which can reversibly bind up to 0.9 H2O molecule per Mo. The presence of surface water is found to have a profound influence on the semiconductor's properties, modulating the material's photoluminescence by over 1 order of magnitude, in transition from dry to moist ambient. Furthermore, the conductivity of a MoSx-based moisture sensor is modulated in excess of 2 orders of magnitude for 30% increase in humidity. As the core application, we utilize the discovered properties of MoSx to develop an electrolyteless water splitting photocatalyst that relies entirely on the hygroscopic nature of MoSx as the water source. The catalyst is formulated as an ink that can be coated onto insulating substrates, such as glass, leading to efficient hydrogen and oxygen evolution from water vapor. The concept has the potential to be widely adopted for future solar fuel production.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology , 77 Massachusetts Avenue, 02139 Cambridge, Massachusetts, United States
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15
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Wimalasiri D, Brkljača R, Piva TJ, Urban S, Huynh T. Comparative analysis of carotenoid content in Momordica cochinchinensis (Cucurbitaceae) collected from Australia, Thailand and Vietnam. J Food Sci Technol 2017; 54:2814-2824. [PMID: 28928521 DOI: 10.1007/s13197-017-2719-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 05/15/2017] [Accepted: 05/23/2017] [Indexed: 11/27/2022]
Abstract
Momordica cochinchinensis (Cucurbitaceae) is the richest source of lycopene and β-carotene of all known fruits but the influences of collection sites, variety and environment on carotenoid accumulation is unknown. This study analysed the carotenoid content of 44 M. cochinchinensis aril samples collected from Australia, Thailand and Vietnam using HPLC, UV-visible spectrophotometry and compared with the colorimetry method. The highest lycopene content was observed in samples collected from Ha Noi (7.76 mg/g) of Northern Vietnam and Lam Ha (6.45 mg/g) and Lam Dong (6.64 mg/g) provinces of Central Vietnam. The highest β-carotene content was observed in a sample from Nam Dinh (9.60 mg/g) in Northern Vietnam while a variety from Hoa Binh province in Northern Vietnam had high contents of both lycopene (5.17 mg/g) and β-carotene (5.66 mg/g). Lycopene content was higher in samples collected from low temperatures (<14 °C) and higher elevations whilst β-carotene content was greatest at temperatures between 27 and 33 °C. Crop improvement for increased lycopene and β-carotene requires rapid and accurate methods of quantification. All three analytical methods utilised were in agreement for lycopene quantification. The (a*/b*)2 transformed colour value resulted in more linear relationship for lycopene indicating that colorimetry method could potentially be developed to select lycopene rich fruits in the field.
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Affiliation(s)
- Dilani Wimalasiri
- School of Applied Sciences (Biotechnology), RMIT University, PO Box 71, Bundoora, 3083 Australia
| | - Robert Brkljača
- School of Applied Sciences (Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, VIC 3001 Australia
| | - Terrence J Piva
- School of Medical Sciences, Health Innovations Research Institute (HIRi), RMIT University, PO Box 71, Bundoora, 3083 Australia
| | - Sylvia Urban
- School of Applied Sciences (Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, VIC 3001 Australia
| | - Tien Huynh
- School of Applied Sciences (Biotechnology), RMIT University, PO Box 71, Bundoora, 3083 Australia
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16
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Brkljača R, Schneider B, Hidalgo W, Otálvaro F, Ospina F, Lee S, Hoshino M, Fujita M, Urban S. Application of the Crystalline Sponge Method to Revise the Structure of the Phenalenone Fuliginone. Molecules 2017; 22:molecules22020211. [PMID: 28146104 PMCID: PMC6155586 DOI: 10.3390/molecules22020211] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 01/25/2017] [Indexed: 11/16/2022] Open
Abstract
The structure of fuliginone was revised from a phenyl substituted phenalenone to a hydroxyl substituted phenalenone as a result of its re-purification via HPLC with subsequent NMR analysis together with an independent synthesis and analysis of the crystal structure, which was secured via the crystalline sponge method. On-flow High Performance Liquid Chromatography coupled to Nuclear Magnetic Resonance spectroscopy (HPLC-NMR) was employed to confirm the presence of the natural product in the plant extract and to monitor for any possible degradation or conversion of the compound.
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Affiliation(s)
- Robert Brkljača
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;
| | - Bernd Schneider
- Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany; (B.S.); (W.H.)
| | - William Hidalgo
- Max-Planck-Institute for Chemical Ecology, Beutenberg Campus, Hans-Knöll-Str. 8, D-07745 Jena, Germany; (B.S.); (W.H.)
| | - Felipe Otálvaro
- Instituto de Química, Síntesis y Biosíntesis de Metabolitos Naturales, Universidad de Antioquia, AA 1226 Medellín, Colombia; (F.Ot.); (F.Os.)
| | - Felipe Ospina
- Instituto de Química, Síntesis y Biosíntesis de Metabolitos Naturales, Universidad de Antioquia, AA 1226 Medellín, Colombia; (F.Ot.); (F.Os.)
| | - Shoukou Lee
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; (S.L.); (M.H.); (M.F.)
| | - Manabu Hoshino
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; (S.L.); (M.H.); (M.F.)
| | - Makoto Fujita
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan; (S.L.); (M.H.); (M.F.)
| | - Sylvia Urban
- School of Science (Applied Chemistry and Environmental Science), RMIT University, GPO Box 2476, Melbourne, Victoria 3001, Australia;
- Correspondence: ; Tel.: +61-3-9925-3376
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17
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Abstract
Chemical investigation of the dichloromethane extract of Rheum ribes has led to the isolation of β-sitosteryl-3β-
glucopyranoside-6'-O-fatty acid esters (1), β-sitosterol (2), phytyl fatty acid esters (3), triacylgly c e r o l s (4) and
chlorophyllide a (5). The structures of 1-5 were identified by comparison of their NMR data with literature data.
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18
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Urban S, Brkljača R, Hoshino M, Lee S, Fujita M. Frontispiz: Determination of the Absolute Configuration of the Pseudo-Symmetric Natural Product Elatenyne by the Crystalline Sponge Method. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201680861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry); RMIT University; GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry); RMIT University; GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Manabu Hoshino
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Shoukou Lee
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Makoto Fujita
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
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19
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Urban S, Brkljača R, Hoshino M, Lee S, Fujita M. Frontispiece: Determination of the Absolute Configuration of the Pseudo-Symmetric Natural Product Elatenyne by the Crystalline Sponge Method. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/anie.201680861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry); RMIT University; GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry); RMIT University; GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Manabu Hoshino
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Shoukou Lee
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Makoto Fujita
- Department of Applied Chemistry; School of Engineering; The University of Tokyo; Hongo, Bunkyo-ku Tokyo 113-8656 Japan
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20
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Urban S, Brkljača R, Hoshino M, Lee S, Fujita M. Determination of the Absolute Configuration of the Pseudo‐Symmetric Natural Product Elatenyne by the Crystalline Sponge Method. Angew Chem Int Ed Engl 2016; 55:2678-82. [DOI: 10.1002/anie.201509761] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Revised: 11/26/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry) RMIT University GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry) RMIT University GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Manabu Hoshino
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Shoukou Lee
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Makoto Fujita
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
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21
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Urban S, Brkljača R, Hoshino M, Lee S, Fujita M. Determination of the Absolute Configuration of the Pseudo‐Symmetric Natural Product Elatenyne by the Crystalline Sponge Method. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201509761] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry) RMIT University GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry) RMIT University GPO Box 2476 Melbourne 3001 Victoria Australia
| | - Manabu Hoshino
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Shoukou Lee
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
| | - Makoto Fujita
- Department of Applied Chemistry School of Engineering The University of Tokyo Hongo, Bunkyo-ku Tokyo 113-8656 Japan
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22
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Brkljača R, Urban S. HPLC-NMR and HPLC-MS investigation of antimicrobial constituents in Cystophora monilifera and Cystophora subfarcinata. Phytochemistry 2015; 117:200-208. [PMID: 26093325 DOI: 10.1016/j.phytochem.2015.06.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Revised: 06/03/2015] [Accepted: 06/08/2015] [Indexed: 06/04/2023]
Abstract
The crude dichloromethane extracts of the marine brown algae Cystophora monilifera and Cystophora subfarcinata were subjected to phytochemical profiling. This enabled the structures of both new and known phloroglucinols to be dereplicated and proposed using HPLC-NMR and HPLC-MS. Subsequent isolation confirmed the presence of four new and eight previously reported compounds. Five of the isolated phloroglucinols displayed selective antimicrobial activity.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
| | - Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia.
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23
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Brkljača R, White JM, Urban S. Phytochemical Investigation of the Constituents Derived from the Australian Plant Macropidia fuliginosa. J Nat Prod 2015; 78:1600-1608. [PMID: 26151487 DOI: 10.1021/acs.jnatprod.5b00161] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A phytochemical study of the flowers and bulbs derived from the Australian plant Macropidia fuliginosa, involving hyphenated spectroscopic methodologies (HPLC-NMR and HPLC-MS), together with conventional isolation strategies, resulted in the identification of 16 constituents (1, 2, 4-17) representative of six different structural classes. Six new compounds (12-17) were identified from the bulbs of the plant. The isolated compounds were assessed for antimicrobial activity, and compound 8 was found to be more potent against P. aeruginosa than ampicillin.
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Affiliation(s)
- Robert Brkljača
- †School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476 V, Melbourne, Victoria 3001, Australia
| | - Jonathan M White
- ‡School of Chemistry and Bio21 Institute, The University of Melbourne Melbourne, Victoria 3010, Australia
| | - Sylvia Urban
- †School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476 V, Melbourne, Victoria 3001, Australia
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24
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Brkljača R, Urban S. HPLC-NMR and HPLC-MS Profiling and Bioassay-Guided Identification of Secondary Metabolites from the Australian Plant Haemodorum spicatum. J Nat Prod 2015; 78:1486-1494. [PMID: 26090896 DOI: 10.1021/np500905g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Phytochemical dereplication was undertaken on the bioactive crude CH2Cl2 extract of the bulbs of the Australian plant Haemodorum spicatum employing HPLC-NMR and HPLC-MS methodologies. Subsequent bioassay-guided isolation resulted in the identification of two new phenylphenalenones [haemoxiphidone (8) and haemodoronol (17)] and two new chromenes [haemodordione (13) and haemodordiol (16)], together with seven previously described compounds. Antimicrobial testing showed that the compounds displayed selective antibacterial activity. Most noteworthy were the activities displayed by several of the compounds against multi-drug-resistant Pseudomonas aeruginosa.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476 V Melbourne, Victoria 3001, Australia
| | - Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476 V Melbourne, Victoria 3001, Australia
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25
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Brkljača R, Gӧker ES, Urban S. Dereplication and chemotaxonomical studies of marine algae of the Ochrophyta and Rhodophyta phyla. Mar Drugs 2015; 13:2714-31. [PMID: 25942092 PMCID: PMC4446602 DOI: 10.3390/md13052714] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2015] [Revised: 04/09/2015] [Accepted: 04/21/2015] [Indexed: 11/16/2022] Open
Abstract
Dereplication and chemotaxonomic studies of six marine algae of the Ochrophyta and one of the Rhodophyta phyla resulted in the detection of 22 separate compounds. All 16 secondary metabolites, including four new compounds (16–19), could be rapidly dereplicated using HPLC-NMR and HPLC-MS methodologies in conjunction with the MarinLit database. This study highlights the advantages of using NMR data (acquired via HPLC-NMR) for database searching and for the overall dereplication of natural products.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia.
| | - Emrehan Semih Gӧker
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia.
| | - Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia.
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26
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Brkljača R, Urban S. Limit of detection studies for application to natural product identification using high performance liquid chromatography coupled to nuclear magnetic resonance spectroscopy. J Chromatogr A 2015; 1375:69-75. [PMID: 25498554 DOI: 10.1016/j.chroma.2014.11.074] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 10/16/2014] [Accepted: 11/27/2014] [Indexed: 10/24/2022]
Abstract
In the pursuit of new natural products, the demand to rapidly identify compounds present, in ever decreasing amounts, in complex crude extracts has become a limiting factor. Despite improvements in HPLC-NMR hardware and pulse sequences, no extensive limit of detection (LOD) investigations have been reported for the acquisition of 2D NMR spectroscopic experiments acquired through HPLC-NMR. In this study the LOD for five key 1D and 2D NMR spectroscopic experiments have been established, using two reference compounds, including the on-flow (WET 1D proton), stop-flow (WET1D proton), gCOSY, HSQCAD and gHMBCAD NMR experiments. The LOD for all of the NMR experiments were within the range of 700ng to 1mg for the set of fixed experimental parameters implemented. For principle components in a complex multi-component mixture, this would allow for in situ compound identification. HPLC-NMR analysis was employed to investigate the principle components present in a marine brown alga crude extract, Cystophora subfarcinata.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences, Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia
| | - Sylvia Urban
- School of Applied Sciences, Health Innovations Research Institute (HIRi), RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia.
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27
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Brkljača R, Urban S. Rapid Dereplication and Identification of the Bioactive Constituents from the Fungus, Leucocoprinus birnbaumii. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501000124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of fatty acids were rapidly dereplicated and partially identified from the flowerpot fungus, Leucocoprinus birnbaumii using HPLC-NMR and HPLC-MS. Subsequent off-line isolation unequivocally established the structures, and anti-microbial testing concluded that the fatty acids displayed moderate but selective anti-microbial activity. This represents the first report of these compounds occurring in this particular terrestrial fungus.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia
| | - Sylvia Urban
- School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia
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28
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Brkljača R, Urban S. Rapid dereplication and identification of the bioactive constituents from the fungus, Leucocoprinus birnbaumii. Nat Prod Commun 2015; 10:95-98. [PMID: 25920228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023] Open
Abstract
A series of fatty acids were rapidly dereplicated and partially identified from the flowerpot fungus, Leucocoprinus birnbaumii using HPLC-NMR and HPLC-MS. Subsequent off-line isolation unequivocally established the structures, and anti-microbial testing concluded that the fatty acids displayed moderate but selective anti-microbial activity. This represents the first report of these compounds occurring in this particular terrestrial fungus.
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29
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Brkljača R, Urban S. Chemical profiling (HPLC-NMR & HPLC-MS), isolation, and identification of bioactive meroditerpenoids from the southern Australian marine brown alga Sargassum paradoxum. Mar Drugs 2014; 13:102-27. [PMID: 25551779 PMCID: PMC4306927 DOI: 10.3390/md13010102] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 12/15/2014] [Indexed: 11/18/2022] Open
Abstract
A phytochemical investigation of a southern Australian marine brown alga, Sargassum paradoxum, resulted in the isolation and identification of four new (5, 9, 10, and 15) and nine previously reported (1, 2, 6-8, and 11-14) bioactive meroditerpenoids. HPLC-NMR and HPLC-MS were central to the identification of a new unstable compound, sargahydroquinal (9), and pivotal in the deconvolution of eight (1, 2, 5-7, and 10-12) other meroditerpenoids. In particular, the complete characterization and identification of the two main constituents (1 and 2) in the crude dichloromethane extract was achieved using stop-flow HPLC-NMR and HPLC-MS. This study resulted in the first acquisition of gHMBCAD NMR spectra in the stop-flow HPLC-NMR mode for a system solely equipped with a 60 μL HPLC-NMR flow cell without the use of a cold probe, microcoil, or any pre-concentration.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia.
| | - Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry), Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia.
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30
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Phan CW, Lee GS, Hong SL, Wong YT, Brkljača R, Urban S, Abd Malek SN, Sabaratnam V. Hericium erinaceus (Bull.: Fr) Pers. cultivated under tropical conditions: isolation of hericenones and demonstration of NGF-mediated neurite outgrowth in PC12 cells via MEK/ERK and PI3K-Akt signaling pathways. Food Funct 2014; 5:3160-9. [DOI: 10.1039/c4fo00452c] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Hericium erinaceus is an edible and medicinal mushroom used traditionally to improve memory.
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Affiliation(s)
- Chia-Wei Phan
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
| | - Guan-Serm Lee
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
| | - Sok-Lai Hong
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
| | - Yuin-Teng Wong
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
| | - Robert Brkljača
- School of Applied Sciences (Discipline of Chemistry)
- Health Innovations Research Institute (HIRi)
- RMIT University
- Melbourne, Australia
| | - Sylvia Urban
- School of Applied Sciences (Discipline of Chemistry)
- Health Innovations Research Institute (HIRi)
- RMIT University
- Melbourne, Australia
| | - Sri Nurestri Abd Malek
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
| | - Vikineswary Sabaratnam
- Mushroom Research Centre
- University of Malaya
- 50603 Kuala Lumpur, Malaysia
- Institute of Biological Sciences
- Faculty of Science
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Urban S, Brkljača R, White JM, Timmers MA. Phenylphenalenones and oxabenzochrysenones from the Australian plant Haemodorum simulans. Phytochemistry 2013; 95:351-359. [PMID: 23972335 DOI: 10.1016/j.phytochem.2013.07.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 07/19/2013] [Accepted: 07/22/2013] [Indexed: 06/02/2023]
Abstract
Chemical investigation of the Australian plant Haemodorum simulans (Haemodoraceae) resulted in the isolation of two new phenylphenalenones, haemoxiphidone and haemodordioxolane from the bulbs together with the first report of an oxabenzochrysenone glycoside, haemodoroxychrysenose from the aerial parts of the plant. Also isolated were two previously described phenylphenalenones 5,6-dimethoxy-7-phenyl-1H,3H-naphtho[1,8-cd]pyran-1,3-dione and haemodorone and two oxabenzochrysenones 5-hydroxyl-2-methoxy-1H-naphtho[2,1,8-mna]xanthen-1-one and 5-methoxy-1H-naphtho[2,1,8-mna]xanthen-1-one. The X-ray structure of the phenylphenalenone 5,6-dimethoxy-7-phenyl-1H,3H-naphtho[1,8-cd]pyran-1,3-dione was secured for the first time. All compounds were deduced by detailed spectroscopic analyses. HPLC-NMR chemical profiling of an enriched fraction containing a mixture of haemodordioxolane and 5,6-dimethoxy-7-phenyl-1H,3H-naphtho[1,8-cd]pyran-1,3-dione facilitated the partial identification of these secondary metabolites. The structure previously assigned as xiphidone in our initial studies of this plant was re-assigned as the new isomer haemoxiphidone.
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Affiliation(s)
- Sylvia Urban
- School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V, Melbourne, Victoria 3001, Australia.
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Brkljača R, Urban S. Relative Configuration of the Marine Natural Product Elatenyne using NMR Spectroscopic and Chemical Derivatization Methodologies. Nat Prod Commun 2013. [DOI: 10.1177/1934578x1300800612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
NMR spectroscopic methodologies used to characterize and elucidate the structure of the marine natural product elatenyne were also applied to the characterization of a new triazole structural derivative of elatenyne, obtained by “Click” chemistry. The two most probable relative configurations assigned to naturally occurring elatenyne were concluded on the basis of key single irradiation nOe NMR enhancements, in combination with the use of a variant of the HSQC NMR experiment that permitted NMR coupling constants to be measured for the overlapped ring junction protons. This study represents the first application of “Click” chemistry to chemically derivatize an unmodified natural product.
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Affiliation(s)
- Robert Brkljača
- School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia
| | - Sylvia Urban
- School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University, GPO Box 2476V Melbourne, Victoria 3001, Australia
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Affiliation(s)
- Robert Brkljača
- a School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University , Melbourne, Victoria, Australia
| | - Sylvia Urban
- a School of Applied Sciences, Health Innovations Research Institute (HIRi) RMIT University , Melbourne, Victoria, Australia
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