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Tartaro Bujak I, Mihaljević B, Ferreri C, Chatgilialoglu C. The influence of antioxidants in the thiyl radical induced lipid peroxidation and geometrical isomerization in micelles of linoleic acid. Free Radic Res 2016; 50:S18-S23. [DOI: 10.1080/10715762.2016.1231401] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Ivana Tartaro Bujak
- Division of Materials Chemistry, Radiation Chemistry and Dosimetry Laboratory, Ruđer Bošković Institute, Zagreb, Croatia
| | - Branka Mihaljević
- Division of Materials Chemistry, Radiation Chemistry and Dosimetry Laboratory, Ruđer Bošković Institute, Zagreb, Croatia
| | - Carla Ferreri
- ISOF, Consiglio Nazionale delle Ricerche, Bologna, Italy
| | - Chryssostomos Chatgilialoglu
- ISOF, Consiglio Nazionale delle Ricerche, Bologna, Italy
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, Athens, Greece
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The effect of aromatic amines and phenols in the thiyl-induced reactions of polyunsaturated fatty acids. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.11.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Sable GA, Park J, Lim SJ, Lim D. Solid-phase Total Synthesis of Amide Analogues of Coibamide A: Azacoibamide A andO-Desmethyl Azacoibamide A. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10674] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Ganesh A. Sable
- Department of Chemistry; Sejong University; Seoul 143-747 Republic of Korea
| | - Jaekwan Park
- Department of Chemistry; Sejong University; Seoul 143-747 Republic of Korea
| | - Soo-Jeong Lim
- Department of Bioscience and Biotechnology; Sejong University; Seoul 143-747 Republic of Korea
| | - Dongyeol Lim
- Department of Chemistry; Sejong University; Seoul 143-747 Republic of Korea
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Sable GA, Park J, Kim H, Lim SJ, Jang S, Lim D. Solid-Phase Total Synthesis of the Proposed Structure of Coibamide A and Its Derivative: Highly Methylated Cyclic Depsipeptides. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500697] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Hengerics Szabó A, Podolec P, Ferenczy V, Kubinec R, Blaško J, Soják L, Górová R, Addová G, Ostrovský I, Višňovský J, Bierhanzl V, Čabala R, Amann A. The analysis of linear and monomethylalkanes in exhaled breath samples by GC×GC-FID and GC–MS/MS. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 978-979:62-9. [DOI: 10.1016/j.jchromb.2014.11.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Revised: 10/28/2014] [Accepted: 11/24/2014] [Indexed: 12/25/2022]
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On-matrix derivatization for dynamic headspace sampling of nonvolatile surface residues. J Chromatogr A 2012; 1256:58-66. [DOI: 10.1016/j.chroma.2012.07.095] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 07/26/2012] [Accepted: 07/30/2012] [Indexed: 11/17/2022]
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Kubinec R, Blaško J, Górová R, Addová G, Ostrovský I, Amann A, Soják L. Equivalent chain lengths of all C4–C23 saturated monomethyl branched fatty acid methyl esters on methylsilicone OV-1 stationary phase. J Chromatogr A 2011; 1218:1767-74. [DOI: 10.1016/j.chroma.2011.01.065] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2010] [Revised: 01/18/2011] [Accepted: 01/20/2011] [Indexed: 11/28/2022]
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Yue Q, Chen YH, Mulder T, Deese A, Takahashi R, Rudewicz PJ, Reynolds M, Solon E, Hop CECA, Wong H, Khojasteh SC. Absorption, Distribution, Metabolism, and Excretion of [14C]GDC-0449 (Vismodegib), an Orally Active Hedgehog Pathway Inhibitor, in Rats and Dogs: A Unique Metabolic Pathway via Pyridine Ring Opening. Drug Metab Dispos 2011; 39:952-65. [DOI: 10.1124/dmd.110.037374] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Ostrovský I, Čabala R, Kubinec R, Górová R, Blaško J, Kubincová J, Řimnáčová L, Lorenz W. Determination of phthalate sum in fatty food by gas chromatography. Food Chem 2011. [DOI: 10.1016/j.foodchem.2010.06.045] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mihaljević B, Tartaro I, Ferreri C, Chatgilialoglu C. Linoleic acid peroxidation vs. isomerization: a biomimetic model of free radical reactivity in the presence of thiols. Org Biomol Chem 2011; 9:3541-8. [DOI: 10.1039/c1ob05083d] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Vervoort HC, Drašković M, Crews P. Histone deacetylase inhibitors as a tool to up-regulate new fungal biosynthetic products: isolation of EGM-556, a cyclodepsipeptide, from Microascus sp. Org Lett 2010; 13:410-3. [PMID: 21174394 DOI: 10.1021/ol1027199] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The histone deacetylase (HDAC) inhibitor suberoylanilide hydroxamic acid (SAHA) was used to turn on the biosynthesis of EGM-556, a new cyclodepsipeptide of hybrid biosynthetic origin, isolated from the Floridian marine sediment-derived fungus Microascus sp. The absolute configurations of three chiral centers were determined by Marfey's derivatization. EGM-556 represents one of the few examples in which silent biosynthetic genes, encoding a new secondary metabolite, were activated by means of epigenetic manipulation of the fungal metabolome.
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Affiliation(s)
- Hélène C Vervoort
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064, USA
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Krkošová Ž, Kubinec R, Soják L, Amann A. Temperature-programmed gas chromatography linear retention indices of all C4–C30 monomethylalkanes on methylsilicone OV-1 stationary phase. J Chromatogr A 2008; 1179:59-68. [DOI: 10.1016/j.chroma.2007.10.081] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Accepted: 10/24/2007] [Indexed: 10/22/2022]
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Beuerle T, Theuring C, Klewer N, Schulz S, Hartmann T. Absolute configuration of the creatonotines and callimorphines, two classes of arctiid-specific pyrrolizidine alkaloids. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2007; 37:80-9. [PMID: 17175448 DOI: 10.1016/j.ibmb.2006.10.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2006] [Revised: 10/23/2006] [Accepted: 10/23/2006] [Indexed: 05/13/2023]
Abstract
Arctiids which as larvae sequester pyrrolizidine alkaloids (PAs) from their food plants are known to synthesize insect-specific PAs by esterifying necine bases derived from plant PAs with necic acids of insect origin. There are two classes of insect PAs, the creatonotines and the callimorphines. The creatonotines contain as necic acids either 2-hydroxy-3-methylbutyric acid (creatonotine A) or 2-hydroxy-3-methylpentanoic acid (creatonotine B). The three known callimorphines contain 2-hydroxy-2-methylbutanoic acid whose hydroxyl group can be either free (deacetylcallimorphine) or acetylated (callimorphine) or propionylated (homocallimorphine). Insect PAs are assumed to play an important role in the recycling of plant derived necine bases and the processing by trans-esterification of PA monoesters that cannot be directly transmitted to the insect's pupal and adult life-stages. The absolute configuration of the insect-specific necic acids was elucidated in the context of the suggested role of the insect PAs as insect-made mimics of plant monoester PAs of the lycopsamine type. For this purpose all needed stereoisomers were synthesized and a gas chromatography-mass spectrometry (GC-MS) method was established that allows the enantioselective separation and assignment of the stereochemistry of all insect specific necic acids as their methyl esters. The method could also be applied to the GC-MS analysis of the intact alkaloids which were hydrolyzed during injection and converted into their methyl esters. Analysis of the creatonotines and callimorphines isolated from the polyphagous arctiids Estigmene acrea and Grammia geneura that were fed with pure PAs and defined PA mixtures revealed the following absolute configuration: the callimorphines and creatonotine A were present in 2'R configuration, whereas creatonotine B was found as mixture of (2'R, 3'S)- and (2'S, 3'S)-stereoisomers. The ratio of 2'S to 2'R was extremely variable ranging from 98% S to 94% R. The cause of the lack of stereospecificity is discussed particularly in respect of a possible epimerization of the hydroxyl group at C-2' in analogy to the known epimerization at C-3' of plant acquired PAs of the lycopsamine type.
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Affiliation(s)
- Till Beuerle
- Institut für Pharmazeutische Biologie, Technische Universität, Mendelssohnstr. 1, D-38106 Braunschweig, Germany
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Campanella L, Chicco F, Colapietro M, Gatta T, Gregori E, Panfili M, Russo MV. Characterization of Wax Manufactures of Hystorical and Artistic Interest. ACTA ACUST UNITED AC 2005; 95:167-76. [PMID: 16485658 DOI: 10.1002/adic.200590019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Purpose of this scientific research is the physic and chemical characterization of two historical wax manufactures, made at the end of XIX century by Francesco Bianchi, a papal engraver. The chemical and analytical investigation was necessary to complete and to confirm the restorer's work. The IR Spectroscopy, X-Ray and GC-MS, the best technique to characterise wax, allowed us to obtain the following results. The two manufactures were made with commercial beeswax: in fact, the relative chromatograms showed unchanged peaks about esters of palmitic acid with C24 to C32 alcohol molecules; using standard beeswax we determined the same amount of hydrocarbons present in the wax manufactures. We found several hydrocarbons in these beeswax materials so that it is reasonable to think about successive modifications. ZnO (white zinc), a pigment, was added, probably due to its colour and covering capacity. Sb2S3, Anthimoniun vermilion, a red-orange pigment, was added to these manufactures to give them a soft pink-orange colour. By all used techniques we determined some modifications in the original beeswax; surely they were made to get a more malleable, mouldable, and then more able to be modelled wax.
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Affiliation(s)
- Luigi Campanella
- Dipartimento di Chimica, Università degli Studi di Roma "La Sapienza", Piazzale Aldo Moro 5, 00185 Roma, Italy.
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Yonamine M, Silva OA. Confirmation of cocaine exposure by gas chromatography-mass spectrometry of urine extracts after methylation of benzoylecgonine. J Chromatogr B Analyt Technol Biomed Life Sci 2002; 773:83-7. [PMID: 12015273 DOI: 10.1016/s0378-4347(01)00516-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Volatility and thermal stability are necessary physical-chemical properties for analysing a substance by gas chromatography. A derivatization step is required before gas chromatography of benzoylecgonine (the main metabolite of cocaine). In the literature, reactions such as silylation, perfluoroalkylation or alkylation are the most frequently used to derivatize benzoylecgonine. However, they allow the formation of products sensitive to moisture or require a purification step. So, a procedure to derivatize benzoylecgonine with diazomethane before gas chromatographic analysis was evaluated. A study was performed to evaluate the efficiency of conversion of benzoylecgonine in cocaine, the necessary time for reaction and the stability of ethereal solution of diazomethane. The reaction was shown to be very fast in mild conditions and there was no need for a further purification step. When benzoylecgonine was extracted from urine by solid-phase extraction and derivatized with diazomethane, concentrations as low as 25 ng/ml could be detected using GC-MS in the full scan mode.
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Affiliation(s)
- Maurício Yonamine
- College of Pharmaceutical Sciences, Toxicology, University of São Paulo, USP Av. Professor Lineu Prestes, 580 CEP 05508-900, São Paulo, SP, Brazil.
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Cruz Márquez M, Arrebola FJ, Egea González FJ, Castro Cano ML, Martínez Vidal JL. Gas chromatographic-tandem mass spectrometric analytical method for the study of inhalation, potential dermal and actual exposure of agricultural workers to the pesticide malathion. J Chromatogr A 2001; 939:79-89. [PMID: 11806548 DOI: 10.1016/s0021-9673(01)01347-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
New analytical gas chromatographic-tandem mass spectrometric approaches have been developed for assessing both potential and actual exposure of agricultural workers to malathion. The metabolites alpha- and beta-malathion monocarboxylic acids have been determined after a derivatisation process in order to obtain their hexafluoroisopropyl esters. Whole body dosimetry was used for potential dermal exposure assessment. Potential exposure by inhalation was estimated using personal air samplers and polyurethane foam plugs as sorbents. The intern dose measurements were carried out by analysing samples of urine after solid-phase extraction with C18. The recoveries of the analytes of the three matrices were between 90 and 102%. Quantification limits were lower than 0.24 ng L(-1). The proposed methods have been applied to evaluate potential and actual exposure of applicators spraying malathion in greenhouses.
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Affiliation(s)
- M Cruz Márquez
- Department of Analytical Chemistry, University of Almeria, Spain
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